Surgical Approaches to the Carpus and Tarsus

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-11

Key Takeaways

• Surgical approaches to the canine and feline carpus and tarsus prioritize exposure for arthrodesis and fracture repair, with the dorsal midline approach being standard for both joints, requiring careful retraction of extensor tendons to protect underlying neurovascular structures and tendon sheaths.
• Critical neurovascular structures requiring meticulous preservation during carpal approaches include the cephalic vein and superficial branch of the radial nerve, while tarsal approaches necessitate protection of the cranial tibial artery and vein, and the superficial peroneal nerve.
• Arthrodesis success hinges on complete articular cartilage removal to subchondral bone, precise limb alignment (10-20 degrees extension for carpus, 135 degrees for tibiotarsal joint), and stable internal fixation, often utilizing dorsal plating with locking or hybrid constructs.
• Implant placement corridors demand attention to screw length to avoid palmar/plantar cortex penetration, with distal radius offering good purchase proximally and the distal tibia providing a longer metaphyseal segment for tarsal fixation.
• Postoperative management varies, with modern locking plates potentially allowing for reduced reliance on rigid external coaptation (e.g., Robert-Jones bandage), though splints or casts are often employed for 4-8 weeks, particularly with conventional plating or in large/compromised patients.
• Recognized complications include implant failure (screw loosening, plate bending), infection (sinus tract formation), and delayed/nonunion, necessitating serial radiographic monitoring and prompt intervention, potentially including bone grafting or implant revision.

This article provides a structured reference for the surgical approaches used to expose the canine and feline carpal and tarsal joints. It is written for practicing veterinarians who perform or assist in arthrodesis and fracture repair of these complex articulations. The content covers patient positioning, incision planning, dissection planes, and implant placement corridors, with attention to the neurovascular structures that limit safe exposure. The goal is to support preoperative planning and intraoperative decision-making instead of to catalogue every described technique.

The carpus and tarsus are high-motion, weight-bearing joints composed of multiple short bones arranged in rows. Their surgical exposure demands a working knowledge of the dorsal, palmar, and plantar retinacular systems, the extensor and flexor tendon sheaths, and the collateral ligament complexes. Approaches differ substantially between the two joints because of their dissimilar skeletal architecture and soft tissue envelopes. The carpus is approached most often for pancarpal or partial arthrodesis, while the tarsus is exposed for tibiotarsal arthrodesis, calcaneoquartal and calcaneocentral arthrodesis, and shear injury reconstruction. Fracture repair of the distal radial physis, accessory carpal bone, and talar neck also requires joint exposure that follows the same principles.

The evidence base for these approaches is largely derived from retrospective case series and technique descriptions. Outcome data for pancarpal arthrodesis using modern plate designs, for example, come from institutional case series that report complication rates and owner satisfaction instead of from randomized trials. The reader should weigh this evidence accordingly and adapt technique choices to the individual patient's conformation, injury pattern, and intended activity level. Where the literature is silent or conflicting, this article states that explicitly.

At a Glance

Functional Anatomy of the Carpus

The carpus is a composite joint formed by the antebrachiocarpal, middle carpal, and carpometacarpal articulations. The antebrachiocarpal joint provides most of the flexion and extension range, while the middle and carpometacarpal joints contribute stability through their interlocking bone shapes and short collateral ligaments. The dorsal surface is covered by the extensor tendons, which run in synovial sheaths beneath the extensor retinaculum. The cephalic vein and the superficial branch of the radial nerve course subcutaneously over the dorsomedial aspect of the joint and must be preserved during approach.

The palmar surface carries the flexor tendons, the carpal pad, and the palmar carpal fibrocartilage. The accessory carpal bone projects laterally and serves as the attachment for the flexor carpi ulnaris tendon and the origin of several palmar ligaments. The radial and ulnar carpal bones articulate with the distal radius and ulna, respectively, and the numbered carpal bones form the distal row. The third and fourth metacarpal bones are the principal weight-bearing columns of the paw, which is why dorsal plate application typically engages these two bones.

Functional Anatomy of the Tarsus

The tarsus comprises the tibiotarsal, proximal intertarsal, distal intertarsal, and tarsometatarsal joints. The talus transmits weight from the tibia to the metatarsus, while the calcaneus serves as the lever arm for the gastrocnemius and superficial digital flexor tendons. The long digital extensor tendon crosses the dorsal aspect of the tibiotarsal joint within its own synovial sheath, and the cranial tibial artery and vein lie deep to the extensor tendons near the joint line. The superficial peroneal nerve runs subcutaneously over the dorsolateral tarsus and is at risk during lateral approaches.

The medial and lateral collateral ligaments provide varus and valgus stability. The medial collateral ligament has long and short components that originate from the medial malleolus and insert on the talus and calcaneus. The lateral collateral ligament similarly has multiple components. Shear injuries commonly disrupt these ligaments and the associated bone surfaces, which is why arthrodesis instead of primary repair is often the definitive treatment. The plantar aspect of the tarsus carries the superficial and deep digital flexor tendons and the plantar ligaments that stabilize the proximal intertarsal joints.

Principles of Exposure for Arthrodesis

Arthrodesis requires broad exposure of the joint surfaces to be denuded, precise alignment of the limb axis, and stable internal fixation. The dorsal approach to both the carpus and tarsus provides access to the joint spaces and allows plate application along the tension surface of the limb. The surgeon must balance the need for exposure against the preservation of the extensor tendons and their sheaths. Retraction of the tendons instead of transection is the standard practice, as transection compromises postoperative function and delays rehabilitation.

Joint denudation is performed with an oscillating saw or rongeurs, removing articular cartilage down to subchondral bone while preserving the overall bone stock. The alignment of the limb in the sagittal plane is critical. For the carpus, the normal standing angle is approximately 10 to 20 degrees of extension, and fusion in a more extended position produces a plantigrade-like posture that overloads the digits. For the tarsus, the tibiotarsal joint is typically fused at a standing angle of approximately 135 degrees, which places the metatarsus in a functional weight-bearing position. The surgeon should verify alignment with the limb held in a normal standing posture before final plate application.

Implant Selection and Placement Corridors

Dorsal plate application is the most common fixation method for both pancarpal and pantarsal arthrodesis. The plate is contoured to the dorsal surface of the distal radius or tibia and the third metacarpal or metatarsal bone. Locking plate designs provide angular stability and reduce the reliance on screw purchase in the short metacarpal and metatarsal bones. Hybrid plates that combine locking and dynamic compression holes allow compression across the arthrodesis site while maintaining locking fixation elsewhere. A retrospective case series of pancarpal arthrodesis using a hybrid dynamic compression plate reported good to excellent owner-assessed outcomes in 15 dogs, with major complications in 17 percent of limbs, including implant failure in a dog with concurrent leishmaniasis. This evidence supports the use of hybrid plating without rigid postoperative coaptation in selected cases, but it also illustrates that implant failure remains a real risk in large or systemically compromised patients.

The plate is positioned over the third metacarpal or metatarsal bone to follow the mechanical axis of the limb. The distal screws should engage at least three metacarpal or metatarsal cortices where possible. Screw length must be measured carefully to avoid penetration of the palmar or plantar cortex, which can irritate the flexor tendons. For the carpus, the distal radius offers good screw purchase, but the short distal segment in small dogs may limit the number of screws that can be placed proximal to the joint. For the tarsus, the distal tibia provides a long metaphyseal segment, but the talus and calcaneus offer limited screw corridors that must be planned from preoperative radiographs.

Soft Tissue Handling and Postoperative Protection

The skin incisions for dorsal approaches are made directly over the joint midline. The subcutaneous tissues are dissected carefully to preserve the cephalic vein and superficial radial nerve at the carpus and the cranial tibial vessels and superficial peroneal nerve at the tarsus. The extensor retinaculum is incised along the tendon of interest and repaired at closure to prevent tendon bowstringing. The joint capsule is incised transversely or in an H-shape to expose the joint surfaces, and the capsule is closed with absorbable suture in a simple continuous pattern.

Postoperative coaptation depends on the fixation method and the patient's size and temperament. Plate fixation with good screw purchase may not require rigid external support, as reported in the hybrid plate series. However, most surgeons still apply a padded bandage or splint for the first two to four weeks to control swelling and protect the incision. External skeletal fixation is an alternative for severely comminuted fractures or when plate fixation is not feasible. The double-arch modified type-1b external skeletal fixator has been described for correction of antebrachial deformities, and the same frame principles can be adapted to carpal arthrodesis when internal fixation is contraindicated. The reader should consult the primary literature for the specific frame configuration and postoperative protocol.

Approach Selection by Procedure

The choice of surgical approach depends on the target joint compartment, the planned procedure, and the implant system selected. The dorsal approach provides the widest exposure for pancarpal arthrodesis and is the default for most carpal procedures. Palmar and medial approaches are reserved for specific fracture configurations, collateral ligament repair, or partial arthrodesis of the accessory carpal bone articulation.

For the tarsus, the dorsal approach exposes the centrodistal and tarsometatarsal joints for partial arthrodesis, while the medial approach is required for medial malleolar fractures and collateral ligament reconstruction. Lateral approaches are used for calcaneoquartal arthrodesis and fractures of the calcaneus or lateral malleolus. Plantar approaches are rarely needed and carry substantial risk to the plantar metatarsal vessels and nerves.

Patient positioning changes the exposure. For the carpus, dorsal recumbency with the limb draped free allows access to both dorsal and palmar surfaces and facilitates intraoperative fluoroscopy. Lateral recumbency is acceptable for unilateral dorsal approaches but limits simultaneous bilateral comparison. For the tarsus, dorsal recumbency with the stifle flexed and the tarsus elevated on a towel roll provides the most versatile access. Lateral recumbency is preferred for calcaneal surgery because it places the lateral surface uppermost and allows the surgeon to work with gravity instead of against it.

Carpal Approach Sequence

Begin with a dorsal midline incision from the distal third of the radius to the mid-metacarpal region. The length should accommodate the planned plate, typically extending 1 to 2 cm beyond the plate ends to allow for implant manipulation. Incise the skin and subcutaneous tissue in the same line. Identify and protect the superficial branch of the radial nerve, which courses dorsolaterally and divides into multiple small branches over the carpus. Transection of these branches produces a variable zone of dorsal paw hypesthesia, which most dogs tolerate well but should be avoided when possible.

Retract the extensor tendons. The common digital extensor tendon lies near midline and can be retracted medially or laterally. The lateral digital extensor tendon sits more laterally and is often retracted with the skin edge. The extensor carpi radialis tendon lies medial to the common digital extensor and must be identified before deep dissection. Incise the joint capsule along the dorsal surface of the carpus, preserving as much capsule as possible for closure. Elevate the capsule from the underlying bone with a periosteal elevator, exposing the radiocarpal, middle carpal, and carpometacarpal joints in continuity.

For pancarpal arthrodesis, the dorsal approach exposes the distal radius, all carpal bones, and the proximal metacarpal bones. The articular cartilage of all three joint spaces must be removed with a burr or curette. The approach must be extended distally to expose the dorsal surfaces of metacarpals III and IV for plate placement. The hybrid dynamic compression plate is applied to the dorsal surface of the third or fourth metacarpal bone, or both in giant breeds, and secured to the distal radius proximally. A retrospective case series of 15 dogs reported that a single hybrid plate sufficed for most patients, while a giant breed dog required dual plates on the third and fourth metacarpal bones to achieve stable fixation without rigid coaptation.

For partial carpal arthrodesis, limit the exposure to the affected joint space. The middle carpal and carpometacarpal joints can be approached through a shorter dorsal incision. The radiocarpal joint is spared, and the plate is placed from the distal radius to the proximal metacarpal bones, or from the distal carpal bones to the metacarpals for carpometacarpal arthrodesis alone.

Tarsal Approach Sequence

The dorsal approach to the tarsus begins with a midline incision from the distal tibia to the proximal metatarsal region. Identify the extensor tendons and retract them laterally. The dorsal pedal artery and vein and the deep peroneal nerve lie deep to the extensor retinaculum and must be protected. Incise the joint capsule over the centrodistal and tarsometatarsal joints. The talocalcaneal and talocrural joints are not exposed through this approach, which limits its use to partial arthrodesis of the distal tarsal joints.

The medial approach is used for medial malleolar fractures and medial collateral ligament repair. Make a curvilinear incision centered over the medial malleolus, curving distally and slightly cranially. Identify and protect the saphenous vein and nerve, which course along the medial aspect of the distal tibia. The medial collateral ligament originates from the medial malleolus and inserts on the talus and calcaneus. The approach must expose the entire ligament for repair or reconstruction. For medial malleolar fractures, the fragment is typically small and the approach can be limited to the malleolus itself.

The lateral approach exposes the calcaneus, lateral malleolus, and calcaneoquartal joint. Make a curvilinear incision over the lateral aspect of the calcaneus, extending from the distal fibula to the calcaneoquartal joint. The lateral saphenous vein runs cranially to the incision and should be preserved. The gastrocnemius tendon inserts on the proximal calcaneus and must be protected during exposure of the calcaneal body. For calcaneoquartal arthrodesis, the approach exposes the calcaneoquartal joint, and the plate is placed on the lateral or plantarolateral surface of the calcaneus and the fourth metatarsal bone.

Intraoperative Decision Points

The extent of articular cartilage removal determines the success of arthrodesis. Incomplete cartilage removal leaves islands of viable cartilage that prevent bony fusion and lead to persistent pain. Use a high-speed burr to remove cartilage down to subchondral bone, and confirm complete removal by visual inspection and palpation with a probe. The subchondral bone should be punctate and bleeding. Overaggressive burring removes structural bone and weakens the arthrodesis construct, particularly in the small carpal and tarsal bones.

Implant position is confirmed intraoperatively with fluoroscopy or radiography. The plate must lie flat against the bone surface, and screws must engage the dorsal cortex and the medullary cavity without penetrating the joint spaces. For pancarpal arthrodesis, the plate should bridge all three carpal joint spaces, and screws in the distal radius should be placed in the dorsal 50% of the bone to avoid the palmar cortex and the carpal canal. For tarsal arthrodesis, screws in the calcaneus must avoid the calcaneoquartal joint unless that joint is included in the fusion.

The decision to use rigid coaptation postoperatively depends on implant stability and patient factors. The hybrid dynamic compression plate was designed to allow pancarpal arthrodesis without rigid coaptation, and the reported case series used only a Robert-Jones bandage for soft tissue support. When a single plate is used in a large or active dog, or when bone quality is poor, additional stabilization with a splint or cast is prudent. The ACVS small animal surgical resources describe postoperative protection as a component of successful arthrodesis outcomes.

Monitoring and Documentation

Postoperative radiographs are obtained immediately after surgery and at 4, 8, and 12 weeks to assess fusion progression. Fusion is confirmed when trabecular bone crosses the arthrodesis site and the joint space is no longer visible. Delayed union is diagnosed when no fusion is evident at 12 weeks. Implant failure is identified by screw loosening, plate bending, or fracture of the plate. The MSD Veterinary Manual professional edition provides reference ranges for normal bone healing timelines that guide these assessments.

Document the surgical approach, the extent of cartilage removal, the implant type and size, the screw positions, and the postoperative radiographic findings. Record any intraoperative complications, including nerve transection, vascular injury, or fracture propagation. This documentation supports postoperative decision-making and provides a baseline for comparison if complications arise.

Recognized Complications and Early Detection

Implant failure remains the most consequential complication after carpal arthrodesis. In a retrospective case series of 15 dogs treated with the hybrid dynamic compression plate, major complications occurred in 3 limbs (17%) and included one surgical site infection and one implant failure in a 43 kg dog with active leishmaniasis Ramirez and Macias, institutional publication. Early detection relies on serial radiographs at 2, 6, and 12 weeks postoperatively. Compare the implant-bone interface against the immediate postoperative study. Look for radiolucent zones around screws, screw back-out, plate bending, or fracture of the plate through a screw hole. Palpate the limb for focal warmth or crepitus over the plate, and document any change in weight-bearing posture.

Infection presents with persistent swelling, serous or purulent discharge, or sinus tract formation. In the same series, one dog developed three episodes of discharging sinus tracts Ramirez and Macias, institutional publication. Obtain aerobic and anaerobic cultures from deep tissue before starting antimicrobial therapy. Monitor serial C-reactive protein or white cell counts where available, but recognize that radiographic changes of osteomyelitis lag clinical signs by 2 to 3 weeks.

Delayed union or nonunion at the arthrodesis site appears as persistent lucency across the joint space beyond 12 weeks. Serial radiographs should show progressive trabecular bridging. If bridging is absent at 16 weeks, consider revision with autogenous cancellous bone graft. Persistent medial carpal instability has been associated with suboptimal functional outcome after corrective osteotomy, so assess carpal alignment under load at each recheck Fitzpatrick et al, institutional publication.

Common Errors and Corrective Action

Less experienced surgeons frequently under-prepare the articular surfaces. Incomplete cartilage removal leaves islands that prevent fusion. Correct this by visualizing the subchondral bone bed under direct vision and using a high-speed burr to create a cancellous surface that bleeds. A second error is inadequate contouring of the plate. The dorsal surface of the distal radius curves distally, and a plate applied without contouring lifts off the bone, reducing screw purchase and increasing soft tissue irritation. Recheck plate-bone contact along the entire length before final screw placement.

Screw placement into the radial carpal bone or the distal radius during partial arthrodesis can violate the radiocarpal joint. Use intraoperative fluoroscopy or confirm screw position with orthogonal radiographs before closure. Over-tightening of screws in the metacarpal bones, which have thin cortices, strips the threads. Advance screws by hand once the near cortex is engaged. Finally, failing to protect the limb with a padded bandage in the immediate postoperative period allows swelling and incisional complications. The hybrid plate series used a Robert-Jones bandage without rigid coaptation, and minor complications occurred in 4 limbs (23%) Ramirez and Macias, institutional publication.

Limitations of Current Evidence

The published evidence for carpal and tarsal arthrodesis consists largely of retrospective case series with small numbers. The hybrid plate series included only 15 dogs, and the double-arch external fixator report described 35 antebrachii in 22 dogs Fitzpatrick et al, institutional publication. No prospective randomised trials compare plate types, screw configurations, or postoperative coaptation protocols. Expert opinion still differs on whether two plates are needed in giant breed dogs, whether the radial carpal bone should be incorporated into a pancarpal arthrodesis, and whether tarsal arthrodesis requires a plantar plate or a lateral plate. The ACVS provides specialist summaries of surgical conditions and expected outcomes, but these do not resolve the comparative questions ACVS animal health resources. The MSD Veterinary Manual offers species-specific guidance on postoperative care and complication recognition MSD Veterinary Manual. Where evidence is contested, document your implant choice and rationale in the medical record.

Referral and Escalation Criteria

Refer to a boarded surgeon when the fracture or luxation extends into the radiocarpal or tibiotarsal joint, when prior implant failure has occurred, or when the patient weighs more than 40 kg and a giant breed plate is not available in your inventory. Refer also when angular deformity requires corrective osteotomy instead of arthrodesis alone, as the double-arch fixator technique demands specific expertise Fitzpatrick et al, institutional publication. Laboratory involvement is indicated for suspected osteomyelitis, for culture and sensitivity testing, and for histopathology when neoplasia is in the differential. Regulatory reporting may apply if a surgical site infection involves a notifiable organizm or if an implant is subject to a recall. Consult the WOAH terrestrial animal health standards for disease reporting obligations in your region WOAH terrestrial animal health code. The AVMA practice resources provide guidance on professional standards for record keeping and complication disclosure AVMA practice resources.

Troubleshooting Table

Frequently Asked Questions

How should I adapt the approach when a locking plate is unavailable for carpal arthrodesis?

When a hybrid dynamic compression plate is not available, a standard DCP or a string-of-pearls plate can be used with the same dorsal exposure. The dorsal midline approach remains unchanged, only the contouring and screw placement differ. Expect to apply a rigid external coaptation splint for 6 to 8 weeks postoperatively, because a non-locking construct provides less angular stability. A Robert-Jones bandage alone is insufficient in this scenario. The hybrid dynamic compression plate case series demonstrated that rigid coaptation could be omitted when a locking hybrid plate was used, but that finding does not transfer to conventional plates. If plate contouring is imperfect, consider a type 1b external skeletal fixator as a salvage option.

What is the minimum equipment set needed to perform a dorsal carpal arthrodesis approach safely?

You need a pneumatic or battery-driven drill with a 2.0 mm and 2.7 mm bit, an oscillating saw or osteotome for partial carpal arthrodesis, a plate bender, and a full set of screw taps and depth gauges. For the approach itself, a periosteal elevator, Hohmann retractors, and Gelpi retractors are sufficient. Do not attempt the procedure without intraoperative fluoroscopy or high-quality radiography, screw placement into the radial carpal bone and distal radius carries a narrow margin for error. The ACVS small animal surgical resources describe the expected instrumentation for carpal procedures. If fluoroscopy is unavailable, obtain orthogonal radiographs before closing the extensor retinaculum, and be prepared to revise malpositioned screws immediately.

How does the surgical approach differ in a cat compared with a dog?

The dorsal carpal and tarsal approaches are anatomically similar in cats, but the smaller size changes several practical points. The extensor tendons lie closer together, so the interval between the common digital extensor and lateral digital extensor is narrower. Use 1.5 mm or 2.0 mm implants instead of the 2.7 mm screws typical in dogs. The feline radial carpal bone is proportionally smaller, which reduces the available screw corridor. For tarsal arthrodesis, the calcaneus is more slender and the tuber calcanei offers a smaller purchase area for a plate. The MSD Veterinary Manual notes species-specific differences in bone density and healing rates that affect implant selection. Consider a 2.0 mm T-plate or a custom-cut DCP for most feline arthrodeses.

What should I document in the medical record for a carpal or tarsal arthrodesis?

Record the preoperative range of motion, the angle of arthrodesis chosen, and the reason for that angle. Document the approach used, the interval between tendons, and any difficulty encountered during exposure. Note the implant type, plate length, screw sizes, and the number of screws placed in each bone segment. Record intraoperative fluoroscopy findings, including the final joint angle and screw positions. Postoperative radiographs should be described with the measured arthrodesis angle. The AVMA practice resources emphasize that surgical records must support continuity of care and medicolegal review. Include a diagram of screw placement if the radiographs are not immediately available. Document any intraoperative complication, even if corrected, because this informs later implant failure assessment.

How do I explain the need for arthrodesis to an owner who expects a joint-sparing repair?

Explain that arthrodesis is not a salvage procedure but a definitive treatment that converts a painful, unstable joint into a rigid weight-bearing column. Use the analogy of a fused hinge: the joint no longer bends, but it bears weight reliably. Describe the expected functional outcome, which in most dogs is excellent owner satisfaction, as reported in the pancarpal arthrodesis outcome study, where 87 percent of owners rated results as excellent. Be explicit about the postoperative timeline: 8 to 12 weeks of activity restriction, then gradual return to leash walks. Warn that the limb will always move as a single unit and that the dog may sit with the affected limb extended. Offer a referral to a surgical specialist if the owner has concerns about the cosmetic appearance.

When should I stop and refer a case instead of proceed with the approach?

Refer when the fracture or luxation extends beyond the joint into the distal radial metaphysis or the proximal metatarsal region, because plate application then requires a longer exposure than the standard approach. Refer if you cannot obtain intraoperative imaging, if the patient weighs more than 40 kg and you only have 2.7 mm implants, or if you have not performed the approach in the preceding 12 months. Active infection at the surgical site, unless planned as a staged debridement, is another indication for referral. The ACVS specialist directory provides criteria for when specialist care is appropriate. If the owner declines referral, document that discussion and proceed only if you can achieve stable fixation with available implants. A poorly executed arthrodesis is worse than a delayed referral.

Related Clinical & Scientific Guides

• Perioperative Antibiotic Prophylaxis: Timing and Selection
• Surgical Approaches to the Femur and Stifle
• Fracture Healing Assessment: Radiographic and Clinical Evaluation

References and Further Reading

• Pancarpal Arthrodesis Without Rigid Coaptation Using the Hybrid Dynamic Compression Plate in Dogs.. 2016.
• The double-arch modified type-1b external skeletal fixator. Technique description and functional outcome for surgical management of canine antebrachial limb deformities.. 2011.
• C8 cross transfer for the treatment of caudal brachial plexus avulsion in three dogs.. 2017.
• Epinephrine and hand surgery.. 2026.
• American College of Veterinary Surgeons Animal Health Resources. American College of Veterinary Surgeons.
• MSD Veterinary Manual, Professional Edition. MSD Veterinary Manual.
• American Veterinary Medical Association Practice Resources. American Veterinary Medical Association.
• WOAH Terrestrial Animal Health Code. 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.