# Surgical Approaches to the Canine Stifle: Medial and Lateral


## Key Takeaways

- The choice between medial and lateral parapatellar stifle arthrotomy in canines is dictated by the location of primary pathology and planned procedure; medial approaches are standard for cranial cruciate ligament (CCL) rupture and medial meniscal issues, while lateral approaches are preferred for lateral compartment pathology.
- Atraumatic joint exposure is paramount; minimizing retinacular incision and avoiding excessive patellar luxation, particularly in extension, reduces iatrogenic cartilage damage, as supported by experimental models demonstrating less cartilage wear with retinaculum-sparing techniques.
- Critical anatomical structures at risk differ between approaches: medial approaches risk the saphenous nerve and vessels, medial collateral ligament, and medial meniscus, whereas lateral approaches risk the peroneal nerve, lateral collateral ligament, and lateral meniscus.
- Patient positioning (dorsal recumbency with limb suspended) and precise incision planning along fascial planes are crucial for adequate exposure and secure layered closure, which is essential for preventing postoperative instability and promoting healing.
- Mini-invasive and retinaculum-sparing arthrotomies offer reduced iatrogenic trauma, particularly for diagnostic exploration or biopsy, but may limit visualization of caudal meniscal horns and require greater technical skill.
- Postoperative complications such as surgical site infection, seroma formation, iatrogenic cartilage damage, and instability require vigilant monitoring, with early detection and appropriate intervention being critical for favorable outcomes.

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This article describes the medial and lateral surgical approaches to the canine stifle joint, with emphasis on patient positioning, incision planning, tissue dissection, and closure. It is written for practicing veterinarians who perform stifle arthrotomy for diagnostic exploration, biopsy, removal of intra-articular fragments, or as the exposure phase of procedures such as cranial cruciate ligament stabilization or patellar luxation correction. The focus is on the approach itself, not on the specific corrective procedures that follow.

A well-executed surgical approach provides adequate exposure while minimizing trauma to the retinaculum, synovium, and articular cartilage. Anatomically correct approaches allow relatively atraumatic entry into the joint and reduce postoperative pain and morbidity [Payne and Constantinescu, review of stifle joint anatomy and surgical approaches in the dog](https://pubmed.ncbi.nlm.nih.gov/8337784/). The choice between a medial or lateral approach depends on the target compartment, the suspected pathology, and the procedure planned. Cranial cruciate ligament rupture, the most common indication for stifle surgery, is typically addressed through a medial parapatellar approach, while lateral approaches are preferred for conditions affecting the lateral compartment or the lateral trochlear ridge [ACVS small animal surgical resources](https://www.acvs.org/small-animal/).

## At a Glance

| Parameter | Medial Approach | Lateral Approach |
|---|---|---|
| Primary indications | Cranial cruciate ligament exploration, medial meniscal inspection, medial patellar luxation | Lateral meniscal pathology, lateral trochlear ridge lesions, lateral patellar luxation |
| Patient positioning | Dorsal recumbency, affected limb suspended or draped free | Dorsal recumbency, affected limb suspended or draped free |
| Skin incision | Parapatellar, medial to the patella | Parapatellar, lateral to the patella |
| Deep dissection | Incise fascia lata and joint capsule medial to the patellar ligament | Incise fascia lata and joint capsule lateral to the patellar ligament |
| Patellar luxation | Medial luxation for exposure of lateral compartment | Lateral luxation for exposure of medial compartment |
| Structures at risk | Medial collateral ligament, medial meniscus, saphenous nerve and vessels | Lateral collateral ligament, lateral meniscus, peroneal nerve |
| Closure | Separate retinacular and subcutaneous layers | Separate retinacular and subcutaneous layers |

## Anatomic Basis of Stifle Approaches

The canine stifle is a complex hinge joint composed of the femorotibial and femoropatellar articulations. The joint capsule is divided into a large femoropatellar pouch and medial and lateral femorotibial compartments. The patellar ligament, the distal continuation of the quadriceps mechanism, inserts on the tibial tuberosity and divides the cranial aspect of the joint into medial and lateral parapatellar regions.

The medial retinaculum is reinforced by the insertion of the sartorius muscle and the medial fascia lata, while the lateral retinaculum receives the lateral fascia lata and the biceps femoris tendon. These fascial layers must be incised in line with their fibers to preserve their strength for closure. The infrapatellar fat pad lies deep to the patellar ligament and must be retracted or partially reflected to expose the cranial cruciate ligament and the menisci.

The blood supply to the stifle arises from the genicular arteries, branches of the popliteal artery. The saphenous artery and nerve course along the medial aspect of the stifle and must be preserved during medial approaches. The peroneal nerve passes over the lateral head of the gastrocnemius muscle and is at risk during lateral approaches that extend too far distally or caudally [Payne and Constantinescu, review of stifle joint anatomy and surgical approaches in the dog](https://pubmed.ncbi.nlm.nih.gov/8337784/).

## Principles of Atraumatic Joint Exposure

The goal of any arthrotomy is to visualize the intra-articular structures without damaging articular cartilage. Retinaculum-sparing approaches have been shown to reduce cartilage wear compared with traditional parapatellar arthrotomies in experimental models. In a porcine model, a minimally invasive approach that spared the patellar retinaculum produced significantly less cartilage damage around created defects than a traditional retinaculum-sacrificing approach, as assessed by blinded gross evaluation [Bonadio et al., retinaculum-sparing surgical approach in an experimental cartilage repair model](https://pubmed.ncbi.nlm.nih.gov/28417444/). While this evidence comes from an experimental model instead of clinical canine patients, it supports the principle that limiting retinacular incision and avoiding unnecessary patellar luxation reduces iatrogenic cartilage injury.

Patellar luxation is often necessary to gain adequate exposure of the femoral condyles and the intercondylar region. The patella should be luxated gently, with the stifle in extension to reduce tension on the quadriceps mechanism. Forced luxation against a tight retinaculum can tear the remaining retinacular fibers or avulse the tibial tuberosity. If the retinaculum is too tight to allow atraumatic luxation, the incision should be extended proximally along the fascia lata instead of applying greater force.

## Patient Positioning and Preparation

The patient is placed in dorsal recumbency for most stifle approaches. The affected limb is suspended from a ceiling hook or positioned on a towel roll to allow access to the medial and lateral aspects of the joint. The limb is clipped from the mid-femur to the mid-tibia, and the foot is covered with a sterile stocking or drape to allow manipulation of the joint during surgery.

For a medial approach, the limb may be positioned with slight external rotation to bring the medial aspect of the stifle into a more accessible plane. For a lateral approach, slight internal rotation improves access to the lateral compartment. The drapes should be applied to allow full range of motion of the stifle, as flexion and extension are required during the procedure to inspect different intra-articular structures.

The surgeon should stand on the side of the limb being approached. An assistant or a positioning device maintains the limb in the desired degree of flexion or extension. The use of a tourniquet is optional and depends on surgeon preference, it is not routinely required for stifle arthrotomy.

## Medial Parapatellar Approach

The medial parapatellar approach is the most commonly used approach to the canine stifle. It provides excellent exposure of the cranial cruciate ligament, the medial meniscus, and the medial femoral condyle, and it is the standard approach for cranial cruciate ligament stabilization procedures.

The skin incision begins approximately 2 cm proximal to the patella, courses along the medial border of the patella and patellar ligament, and ends at the tibial tuberosity. The subcutaneous tissue is incised in the same line, and the underlying fascia is exposed. The fascia lata and the joint capsule are incised together as a single layer, starting at the proximal pole of the patella and extending distally along the medial border of the patellar ligament. The incision is made approximately 3 to 5 mm medial to the patellar ligament to leave a cuff of tissue for closure.

The joint capsule is opened, and the infrapatellar fat pad is identified. The fat pad is retracted laterally or partially excised to expose the intercondylar region. The patella is then luxated laterally by extending the stifle and applying gentle medial-to-lateral pressure on the patella. This maneuver exposes the femoral trochlea and the femoral condyles.

With the patella luxated, the cranial cruciate ligament can be inspected from its origin on the lateral femoral condyle to its insertion on the cranial intercondyloid area of the tibia. The medial meniscus is visualized by applying valgus stress to the stifle while it is in flexion, which opens the medial femorotibial compartment. The lateral meniscus can be inspected by applying varus stress.

Closure is performed in layers. The joint capsule and fascia lata are closed as a single layer with absorbable suture in a simple continuous or interrupted pattern. The subcutaneous tissue is closed separately, and the skin is closed routinely. The retinacular closure must be secure to prevent postoperative joint instability or herniation of the fat pad.

## Lateral Parapatellar Approach

The lateral parapatellar approach provides access to the lateral compartment of the stifle, the lateral femoral condyle, the lateral tibial plateau, and the origin of the long digital extensor tendon. It is the approach of choice when the primary pathology lies lateral to the sagittal midline, including lateral meniscal tears, lateral femoral condylar lesions, and avulsion fractures of the long digital extensor origin.

Position the patient in lateral recumbency with the affected limb uppermost. A sandbag or vacuum-positioning device placed beneath the greater trochanter elevates the limb and allows the stifle to be positioned in slight flexion. The limb is clipped from mid-thigh to mid-tibia, and a standard hanging-limb preparation is performed. The surgeon stands caudal to the limb.

The skin incision begins 3 to 4 cm proximal to the patella, centered over the lateral border of the quadriceps muscle group, and extends distally along the lateral margin of the patellar ligament to the tibial tuberosity. The subcutaneous fascia is incised in the same line. The incision is continued through the fascia lata along the cranial border of the biceps femoris muscle. The biceps femoris is retracted caudally, exposing the lateral aspect of the joint capsule and the lateral femoral condyle.

The joint capsule is incised parallel to the patellar ligament, approximately 3 to 5 mm lateral to its border. The incision begins at the proximal limit of the suprapatellar pouch and extends distally to the level of the tibial plateau. The incision may be extended proximally into the vastus lateralis tendon if additional exposure of the trochlea is required. The patella is luxated medially with the limb in extension, and the joint is opened with a combination of external rotation of the tibia and varus stress. A Gelpi retractor placed across the joint capsule and a Hohmann retractor seated on the caudal aspect of the tibial plateau provide the standard exposure.

The lateral approach offers a distinct advantage over the medial approach when the medial collateral ligament and the medial meniscus must remain undisturbed. The lateral meniscus, however, lies deep within the exposure and may require partial release of the lateral collateral ligament or the popliteus tendon for complete visualization. The common peroneal nerve courses caudal to the stifle and is not directly encountered, but excessive caudal retraction of the biceps femoris can place traction on the nerve. The surgeon should verify normal tibial and peroneal nerve function after closure when the approach has been combined with aggressive retraction.

## Mini-Invasive and Retinaculum-Sparing Alternatives

A complete parapatellar arthrotomy with patellar luxation provides the widest field but carries a measurable cost. Experimental work in a porcine model demonstrated that a traditional retinaculum-sacrificing arthrotomy produced significantly greater cartilage wear on the trochlea than a retinaculum-sparing approach, with gross cartilage injury scores of 3.2 versus 0.8 and 2.8 versus 0 from two blinded raters [retinaculum-sparing approach preserves porcine stifle joint cartilage](https://pubmed.ncbi.nlm.nih.gov/28417444/). The clinical relevance of this finding in dogs is not fully established, but it supports the principle that the smallest exposure sufficient for the planned procedure is preferable.

A mini-arthrotomy, performed through a 2 to 3 cm capsular incision without patellar luxation, is adequate for diagnostic exploration, synovial biopsy, and removal of small loose bodies. The approach is performed with the stifle in flexion and the patella maintained in the trochlear groove. A 30-degree arthroscope or a small joint probe can be introduced through the same incision. The principal limitation is the inability to inspect the caudal horn of the medial meniscus without additional retraction or a separate caudomedial portal.

Retinaculum-sparing techniques preserve the parapatellar retinaculum and the synovial lining of the joint. These approaches are technically more demanding because the capsular incision is placed directly over the target structure instead of along a standard parapatellar line. They are best suited to procedures with a precisely localized target, such as cartilage repair or fragment removal. The surgeon must accept reduced mobility of the patella and a smaller working corridor.

## Approach Selection and Decision Framework

The choice between medial and lateral approaches is determined by the location of the primary lesion, the planned procedure, and the surgeon's familiarity with the exposure. The following framework summarizes the decision points.

| Clinical Scenario | Preferred Approach | Rationale | Key Limitation |
|---|---|---|---|
| Medial meniscal injury, medial femoral condyle lesion | Medial parapatellar | Direct visualization of medial compartment | Requires patellar luxation for full exposure |
| Lateral meniscal injury, long digital extensor avulsion | Lateral parapatellar | Direct visualization of lateral compartment | Lateral meniscus may require collateral release |
| Cranial cruciate ligament rupture, diagnostic arthrotomy | Medial parapatellar | Standard exposure for cruciate assessment and meniscal probing | None significant |
| Isolated trochlear ridge lesion, cartilage repair | Retinaculum-sparing or mini-arthrotomy | Reduced iatrogenic cartilage wear | Limited working space |
| Patellar luxation with concurrent cruciate disease | Medial parapatellar | Allows medial retinacular imbrication and lateral release in one field | May require extension of incision |

The medial approach is the default for most surgeons because it provides the most direct route to the cranial cruciate ligament and the medial meniscus, the two structures most frequently implicated in canine stifle lameness. Cranial cruciate ligament rupture is a common cause of stifle pain in dogs [short-term outcomes of cranial cruciate ligament rupture](https://pubmed.ncbi.nlm.nih.gov/38417876/), and the medial approach accommodates both diagnostic and therapeutic procedures on this structure. The lateral approach is reserved for pathology that is clearly lateralised or for revision procedures where the medial compartment has already been explored.

Patient size and body condition modify the approach. In small-breed dogs weighing less than 10 kg, the joint capsule is thin and the patellar ligament is narrow, which makes the parapatellar incision proportionally larger relative to the joint. The surgeon should place the capsular incision closer to the patellar ligament in these patients to preserve retinacular tissue for closure. In obese patients, the subcutaneous fat layer obscures the fascial planes, and the surgeon should identify the patellar ligament by palpation before incising the skin. In patients with severe periarticular fibrosis from chronic lameness, the joint capsule may be thickened and adherent to the underlying femur, and sharp dissection is required to identify the joint margin.

The presence of concurrent medial patellar luxation does not change the approach selection for a cruciate procedure, but it does alter the closure. The medial parapatellar approach provides simultaneous access for medial retinacular imbrication and lateral release when these are indicated. In small-breed dogs with concurrent cruciate rupture and medial patellar luxation, surgical treatment with tibial plateau leveling osteotomy has been compared with non-surgical management, and both groups showed improved short-term outcomes [short-term outcomes of cranial cruciate ligament rupture](https://pubmed.ncbi.nlm.nih.gov/38417876/). The surgical approach itself, however, remains the same regardless of the definitive procedure.

## Closure and Postoperative Considerations

Closure follows a standard layered pattern. The joint capsule is closed with absorbable monofilament suture in a simple continuous or interrupted pattern. The suture should engage the full thickness of the capsule but must not incorporate the synovium alone, as this tears easily under tension. The fascia lata or the medial retinaculum is closed as a separate layer with the same suture material. The subcutaneous layer is closed with absorbable suture, and the skin is closed with a buried intradermal pattern or skin staples.

The tension on the capsular closure should be assessed with the stifle in extension and in flexion. Excessive tension in flexion indicates that the capsular incision was placed too far from the patellar ligament, and the closure may fail under postoperative loading. The surgeon should verify that the patella tracks normally in the trochlear groove after closure and that it does not luxate with manual stress.

Postoperative monitoring focuses on the return to weight-bearing, the degree of joint effusion, and the integrity of the incision. Mild lameness for the first 48 to 72 hours is expected after any arthrotomy. Progressive lameness beyond this period, particularly with a tense, painful joint, suggests haemarthrosis or early infection and warrants re-evaluation. The owner should be instructed to restrict activity to short leash walks for the first two weeks and to apply cold therapy to the stifle for the first 48 hours. The role of physical rehabilitation in the management of joint disease is well established [proposed framework for practical multimodal management of osteoarthritis](https://pubmed.ncbi.nlm.nih.gov/40357193/), and a structured rehabilitation program should begin once the incision has healed.

The choice of approach influences the postoperative rehabilitation plan only in the degree of soft tissue trauma. A retinaculum-sparing approach is associated with less iatrogenic cartilage damage in experimental models [retinaculum-sparing approach preserves porcine stifle joint cartilage](https://pubmed.ncbi.nlm.nih.gov/28417444/), which may translate to less postoperative pain and faster return to function, although this has not been confirmed in clinical canine patients. The surgeon should document the approach used, the structures visualized, and any complications encountered in the surgical record. This documentation supports accurate postoperative assessment and provides a baseline for future comparisons if the patient requires revision surgery.

Anatomically correct approaches to the stifle provide relatively atraumatic entry into the joint while affording adequate exposure for the intra-articular portion of the procedure [stifle joint anatomy and surgical approaches in the dog](https://pubmed.ncbi.nlm.nih.gov/8337784/). The surgeon who masters both the medial and lateral parapatellar approaches, and who understands when a smaller exposure is appropriate, is equipped to manage the full range of canine stifle pathology.

## Complications and Early Detection

The principal complications after stifle arthrotomy are surgical site infection, seroma formation, delayed healing, iatrogenic cartilage damage, and postoperative instability. Each has identifiable early markers.

Surgical site infection typically declares itself between days 3 and 7. Heat, swelling, incisional discharge, and progressive lameness that worsens instead of improves after initial recovery should raise suspicion. Early detection relies on daily assessment of the incision and serial orthopedic examinations. A persistent elevation in body temperature beyond 48 hours postoperatively, particularly in a patient that was eating well on day one, warrants investigation. Cytology of any exudate distinguishes septic inflammation from serous accumulation.

Seromas present as fluctuant, nonpainful swellings adjacent to the incision, usually within the first week. They result from dead space created when the subcutaneous layer is closed under tension or when the retinacular suture line leaks synovial fluid. Detection is by palpation and ultrasound if the swelling is deep. Most small seromas resorb with conservative management, but large or expanding seromas may require drainage under strict aseptic technique.

Iatrogenic cartilage damage is the most insidious complication because it is not visible postoperatively. The surgeon detects it intraoperatively as visible scoring, fibrillation, or indentation of the femoral condyles or trochlear ridges. The retinaculum-sparing approach has been associated with less cartilage wear than traditional parapatellar arthrotomy in an experimental porcine model, with significantly better gross cartilage scores at two to three weeks postoperatively [retinaculum-sparing approach preserves porcine stifle joint cartilage](https://pubmed.ncbi.nlm.nih.gov/28417444/). This finding supports the use of atraumatic exposure techniques whenever the procedure permits.

Postoperative instability is detected by cranial drawer testing and tibial compression testing at the two-week recheck. Mild laxity may be acceptable in small-breed dogs managed conservatively, where short-term outcomes can be comparable to surgical treatment [short-term outcomes of cranial cruciate ligament rupture in small-breed dogs](https://pubmed.ncbi.nlm.nih.gov/38417876/), but progressive instability after a stabilization procedure indicates implant failure or inadequate technique.

## Common Errors and Corrective Actions

The most frequent error in stifle approaches is inadequate exposure achieved through an incision placed too far medially or laterally. The parapatellar incision must be positioned directly over the appropriate border of the patella, not over the femoral shaft. When exposure is insufficient, the surgeon should extend the incision proximally and distally instead of retracting harder, which tears tissue.

A second common error is transecting the patellar ligament or avulsing its tibial insertion during aggressive retraction. The patella should be luxated gently, with the stifle in extension, and the surgeon must verify that the patellar ligament is under direct vision before applying force.

Incorrect identification of the joint capsule is another frequent problem. The fascia lata and the joint capsule are distinct layers laterally, and entering the joint too superficially creates a false plane. The surgeon should identify the synovial membrane by its glistening appearance and confirm entry by observing synovial fluid.

Students and less experienced clinicians often fail to protect the menisci during exploration. The menisci are damaged by rough instrumentation, particularly when the joint is held in flexion and the probe is forced into the intercondylar space. The meniscal probe should be introduced gently along the tibial plateau, never against resistance.

Finally, closure errors include asymmetric retinacular suture placement, which causes patellar tracking abnormalities, and excessive tension on the retinacular layer, which restricts flexion. The retinacular layer should be closed with the stifle in partial flexion to avoid overtightening.

## Limitations of the Evidence

The evidence base for specific stifle approach techniques is limited. Most published descriptions are expert opinion or cadaveric studies instead of randomized clinical trials. The comparative study of retinaculum-sparing versus traditional arthrotomy was performed in pigs, not dogs, and the clinical relevance of the cartilage wear difference in canine patients remains uncertain [retinaculum-sparing approach preserves porcine stifle joint cartilage](https://pubmed.ncbi.nlm.nih.gov/28417444/).

Expert opinion differs on several points. Some surgeons advocate routine medial parapatellar arthrotomy for all cruciate procedures because it provides excellent access to the intercondylar region. Others prefer lateral approaches to preserve the medial retinaculum, which is thought to contribute to stifle stability. Neither position is supported by high-quality comparative data.

The role of mini-invasive approaches in clinical canine practice is still being defined. While the experimental evidence suggests reduced cartilage trauma, the practical limitations of visualization and instrumentation in small and medium breeds remain a concern. The framework for osteoarthritis management in growing dogs acknowledges that surgical decisions must be individualized, and the same principle applies to approach selection [framework for practical multimodal management of osteoarthritis in growing dogs](https://pubmed.ncbi.nlm.nih.gov/40357193/).

## Referral and Escalation Criteria

Referral to a board-certified surgeon is appropriate when the primary surgeon lacks experience with the specific procedure, when the patient has had previous stifle surgery with uncertain anatomy, or when intraoperative findings exceed the planned scope of the procedure. Examples include unsuspected meniscal tears requiring repair, severe cartilage erosion, or concurrent patellar luxation that was not identified preoperatively.

Specialist consultation is also warranted when postoperative complications do not respond to first-line management. Persistent lameness beyond six weeks, recurrent effusion, or suspected infection that does not resolve with appropriate antimicrobial therapy should prompt referral for advanced imaging and possible revision surgery.

Laboratory involvement is indicated when infection is suspected. Synovial fluid analysis with cytology and bacterial culture should be performed before initiating antimicrobial therapy. Aerobic and anaerobic cultures are recommended, and samples should be obtained by arthrocentesis under aseptic conditions.

Regulatory reporting is rarely required for routine stifle surgery. However, if an implant is found to be defective or if an unexpected complication pattern emerges that suggests a product problem, the manufacturer and the relevant regulatory authority should be notified. The [AVMA practice resources](https://www.avma.org/resources-tools) provide guidance on professional responsibilities and adverse event reporting.

## Frequently Asked Questions

### How Do I Choose Between a Medial and Lateral Approach for a Stifle Arthrotomy?

The primary indication dictates the side. Use a medial parapatellar approach for medial patellar luxation, medial meniscal release, or access to the medial femoral condyle. Use a lateral parapatellar approach for lateral patellar luxation, lateral meniscal pathology, or access to the lateral femoral condyle. For cranial cruciate ligament work, either side provides adequate joint visualization, but the lateral approach is often preferred because it allows easier access to the fabellae for extracapsular stabilization. When concurrent medial patellar luxation and cranial cruciate ligament rupture are present, the medial approach addresses both pathologies through one incision. Review the [stifle joint anatomy and surgical approaches in the dog](https://pubmed.ncbi.nlm.nih.gov/8337784/) before selecting your exposure.

### What Should I Do When I Cannot Luxate the Patella During a Parapatellar Approach?

Patellar luxation can fail because the retinacular incision is too short, the incision is not extended proximally enough through the vastus lateralis or medialis fascia, or because periarticular fibrosis restricts mobility. Extend the skin and fascial incisions proximally by 2 to 3 cm to release the quadriceps mechanism. Check that the retinacular incision is placed directly at the parapatellar margin instead of too far from the patella. If tension persists, partially release the patellar ligament insertion or consider a tibial tuberosity transposition if the underlying problem is a shallow trochlear groove. Do not use excessive force to luxate the patella, as this can fracture the patella or avulse the patellar ligament. A retinaculum-sparing approach may reduce iatrogenic cartilage damage compared with traditional luxation techniques, as shown in an [experimental animal model of cartilage repair](https://pubmed.ncbi.nlm.nih.gov/28417444/).

### How Does My Approach Change in Small-Breed Dogs Weighing Less Than 10 kg?

Small-breed dogs present the same anatomic landmarks but with less working room. Use smaller retractors, such as Senn or baby Hohmann retractors, and extend the skin incision slightly longer than in larger dogs to compensate for the reduced soft tissue mobility. The patella is relatively larger compared with the joint, making luxation more difficult. Consider a mini-invasive parapatellar approach with a limited retinacular incision to reduce exposure time and postoperative discomfort. In small-breed dogs with cranial cruciate ligament rupture, [short-term outcomes of surgical versus non-surgical management](https://pubmed.ncbi.nlm.nih.gov/38417876/) show comparable improvement, so the surgical approach should be as atraumatic as possible to justify the intervention. Magnification loupes help identify the thin retinacular layers and avoid inadvertent capsular damage.

### What Are the Minimum Instrument Requirements for a Safe Stifle Approach?

A No. 10 or No. 15 scalpel blade, Metzenbaum scissors, a periosteal elevator, Gelpi or Weitlaner self-retaining retractors, and a Hohmann retractor placed behind the femur are sufficient for most medial and lateral approaches. A bone hook or towel clamp assists with patellar luxation. You do not need powered equipment for the approach itself, only for the intra-articular procedure that follows. If self-retaining retractors are unavailable, hand-held Army-Navy retractors work but require an assistant. Suture material for closure should include absorbable monofilament for the joint capsule and non-absorbable or slow-absorbing monofilament for the fascia. The [ACVS animal health resources](https://www.acvs.org/small-animal/) describe standard surgical instrumentation expectations for joint procedures.

### How Should I Document the Surgical Approach in the Medical Record?

Record the patient positioning, the specific approach used (medial versus lateral parapatellar), the length of the skin incision, whether the patella was luxated, and any difficulty encountered during exposure. Note the condition of the articular cartilage at the time of entry, including any pre-existing wear or fibrillation, because this documents the baseline for postoperative comparison. Describe the retinacular incision and closure method, including suture size and pattern. Photographs are valuable for teaching and for medicolegal documentation. Record the estimated blood loss and any intraoperative complications, such as inadvertent retinacular tearing or partial patellar ligament damage. The [AVMA practice resources](https://www.avma.org/resources-tools) provide general guidance on surgical record keeping standards.

### How Do I Explain the Need for a Surgical Approach to a Client Who Is Hesitant?

Explain that the approach is the access step, not the treatment itself, and that the quality of this access directly affects the success of the intra-articular procedure. Use a simple analogy, such as opening a door to repair a room. Describe that a poorly planned approach can damage cartilage or delay healing, while a careful approach minimizes postoperative pain and speeds recovery. Mention that the surgeon selects the side based on the specific pathology identified on examination and imaging. Be honest about the expected recovery timeline and the need for controlled activity afterward. For clients concerned about cost, clarify that the approach is included in the surgical fee and that choosing a non-surgical option carries its own costs, as [short-term outcome data in small-breed dogs](https://pubmed.ncbi.nlm.nih.gov/38417876/) show both pathways require rehabilitation and monitoring.

## Related Clinical & Scientific Guides

* [Perioperative Antibiotic Prophylaxis: Timing and Selection](/knowledge/veterinary-medicine/veterinary-surgery/perioperative-antibiotic-prophylaxis-timing-selection)
* [Surgical Approaches to the Femur and Stifle](/knowledge/veterinary-medicine/veterinary-surgery/surgical-approaches-femur-stifle)
* [Fracture Healing Assessment: Radiographic and Clinical Evaluation](/knowledge/veterinary-medicine/veterinary-surgery/fracture-healing-assessment-radiographic-clinical)


## References and Further Reading

- [A proposed framework for practical multimodal management of osteoarthritis in growing dogs.](https://pubmed.ncbi.nlm.nih.gov/40357193/). 2025.
- [Short-term outcomes of cranial cruciate ligament rupture treated surgically with tibial plateau leveling osteotomy or non-surgically in small-breed dogs weighing less than10 kg.](https://pubmed.ncbi.nlm.nih.gov/38417876/). 2024.
- [A retinaculum-sparing surgical approach preserves porcine stifle joint cartilage in an experimental animal model of cartilage repair.](https://pubmed.ncbi.nlm.nih.gov/28417444/). 2017.
- [Evaluation of the Suitability of Miniature Pigs as an Animal Model of Juvenile Osteochondritis Dissecans.](https://pubmed.ncbi.nlm.nih.gov/31115932/). 2019.
- [Stifle joint anatomy and surgical approaches in the dog.](https://pubmed.ncbi.nlm.nih.gov/8337784/). 1993.
- [American College of Veterinary Surgeons Animal Health Resources](https://www.acvs.org/small-animal/). American College of Veterinary Surgeons.
- [MSD Veterinary Manual, Professional Edition](https://www.msdvetmanual.com/). MSD Veterinary Manual.
- [American Veterinary Medical Association Practice Resources](https://www.avma.org/resources-tools). American Veterinary Medical Association.
- [WOAH Terrestrial Animal Health Code](https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/). WOAH.

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> This article is educational professional reference material for veterinary audiences. It is not a substitute for veterinary diagnosis, individual clinical judgment, current product labeling, or applicable regulatory requirements.