# Osteomalacia: Causes, Mechanism and Bone Changes

Osteomalacia is a metabolic bone disease in which mature bone matrix is laid down but fails to mineralize properly, so the skeleton accumulates excess unmineralized osteoid and becomes soft and weak. It is the same mineralization defect as rickets, but rickets affects the growth plate of young growing animals while osteomalacia affects bone that has already formed.

The distinction matters because osteomalacia and rickets are frequently confused with osteoporosis, a completely different problem. In osteoporosis the bone that exists is normally mineralized, there is simply less of it. In osteomalacia the mineral content per unit of matrix is low. That single difference changes the histology, the biochemistry and the radiographs, and it changes what a clinician should look for. In production animals, especially cattle on phosphorus-deficient pasture, osteomalacia is a herd-level disease with real economic weight, and it responds to mineral correction [1]. In small animals, reptiles and horses it appears through a different set of causes, and recognizing the pattern is what allows a diagnosis.

This article is educational and is not a substitute for veterinary diagnosis or treatment.

## Defining Terms: Osteomalacia, Rickets and Osteoporosis

Three terms describe three different failures, and students lose marks by mixing them.

**Osteomalacia** is defective mineralization of mature bone. Osteoid, the unmineralized organic matrix made largely of type I collagen, is produced by osteoblasts at a normal or near-normal rate, but the calcium and phosphate needed to convert it into hydroxyapatite are not delivered in sufficient quantity or at the right time. The result is an excess of osteoid and widened osteoid seams [2][3].

**Rickets** is defective mineralization at the growth plate and adjacent metaphysis in a growing animal. The epiphyseal cartilage fails to calcify and mature normally, so the physis thickens and the metaphysis becomes irregular. Because growing animals have both growth plates and remodeling bone, rickets and osteomalacia coexist in the young. In animals with closed growth plates, only osteomalacia can occur [4][5][6].

**Osteoporosis** is reduced bone mass with normal mineralization. The osteoid that is present mineralizes correctly. Bone mineral density falls, but the mineral-to-matrix ratio does not. Bone histomorphometry and quantitative backscattered electron imaging can separate these conditions when a bone density measurement alone cannot [3][4].

| Feature | Osteomalacia | Rickets | Osteoporosis |
|--|--|--|--|
| Primary defect | Mineralization of mature osteoid | Mineralization at growth plate | Bone mass |
| Osteoid volume | Increased | Increased | Normal |
| Osteoid seam width | Widened | Widened | Normal |
| Mineral-to-matrix ratio | Low | Low | Normal |
| Growth plate affected | No | Yes | No |
| Age group | Any age | Growing animals | Mostly adults |
| Serum ALP | Often elevated | Elevated | Usually normal |
| Serum phosphorus | Often low | Often low | Usually normal |

## The Vitamin D, Calcium and Phosphorus Axis

Mineralization is not a passive precipitation reaction. It depends on a regulated supply of calcium and phosphate to the mineralization front, and on the absence of inhibitors such as inorganic pyrophosphate [4]. The vitamin D-calcium-phosphorus axis is the control system that keeps that supply adequate.

### Step 1: Vitamin D enters the system

Vitamin D comes from the diet or from cutaneous synthesis under ultraviolet light. It is biologically inactive until it is hydroxylated twice.

- The liver converts vitamin D to **25-hydroxyvitamin D [25(OH)D]**, the main circulating storage form and the best available index of vitamin D nutrition [2].
- The kidney converts 25(OH)D to **1,25-dihydroxyvitamin D [1,25(OH)2D]**, also called calcitriol, the active hormone. This step is catalyzed by the enzyme CYP27B1 and is stimulated by parathyroid hormone (PTH) and by low phosphate [7].

### Step 2: 1,25(OH)2D drives intestinal absorption

Calcitriol acts on the intestine to increase absorption of both calcium and phosphate. When 25(OH)D is low, the substrate for calcitriol is low, calcitriol production falls, and intestinal mineral absorption drops. This is the core of nutritional osteomalacia [5].

### Step 3: PTH responds to falling calcium

A fall in ionized calcium is sensed by the parathyroid glands, which release PTH. PTH does three things:

1. It increases renal reabsorption of calcium.
2. It stimulates CYP27B1 in the kidney, raising calcitriol.
3. It promotes phosphate excretion in the urine, because phosphate retention would worsen the hypocalcemia by complexing calcium.

In early vitamin D deficiency, this compensation can keep serum calcium normal. PTH and [alkaline phosphatase](/knowledge/molecular-biology/alkaline-phosphatase) (ALP) rise first, and 1,25(OH)2D may actually be elevated as a consequence of the PTH drive [2].

### Step 4: Phosphate wasting breaks the system

Phosphate is the other half of hydroxyapatite. Fibroblast growth factor 23 (FGF23), produced by osteocytes, reduces renal phosphate reabsorption and suppresses calcitriol production [8][7]. When FGF23 is excessive, as in X-linked hypophosphatemia or tumor-induced osteomalacia, phosphate is lost in urine despite normal or low serum phosphate, and calcitriol falls. The result is hypophosphatemic osteomalacia [8][9][10]. The same pattern occurs in renal tubular disorders where the proximal tubule cannot reclaim phosphate, including Fanconi syndrome and renal tubular acidosis [11][12].

### Step 5: Mineralization fails

When the product of calcium and phosphate at the mineralization front is too low, or when an inhibitor such as pyrophosphate blocks hydroxyapatite formation, osteoid accumulates. Mineralization is delayed rather than absent, and the unmineralized layer thickens. In salmon, this defect was reversible: after nine weeks on a regular phosphorus diet, mineral content and mechanical properties of vertebral bodies were largely restored, and mineralization resumed deep inside the bone away from osteoblasts [13]. That observation shows that the defect is a timing and supply problem, not permanent destruction of the matrix.

```mermaid
flowchart TD
    [Low vitamin D intake or low sun exposure] --> [Low 25 OH D]
    [Low 25 OH D] --> [Low calcitriol]
    [Low calcitriol] --> [Poor gut calcium and phosphate uptake]
    [Poor gut calcium and phosphate uptake] --> [Low serum calcium]
    [Low serum calcium] --> [PTH rises]
    [PTH rises] --> [Bone resorption and phosphate loss in urine]
    [PTH rises] --> [Low phosphate at bone surface]
    [Low phosphate at bone surface] --> [Osteoid fails to mineralize]
    [Osteoid fails to mineralize] --> [Wide osteoid seams and soft bone]
```

## Causes of Osteomalacia

The causes fall into three broad groups: too little mineral substrate, too much phosphate loss, and direct inhibition of mineralization.

### Nutritional deficiency

Dietary calcium deficiency and solar or dietary vitamin D deficiency are the most common acquired causes worldwide [4][5]. In grazing cattle, phosphorus deficiency in native pasture is the classic driver. In one study of cows with clinical chronic phosphorus deficiency, soil bicarbonate-extractable phosphorus was 3.5 mg/kg, forage total phosphorus averaged 0.95 g/kg dry matter, serum inorganic phosphorus averaged 0.96 mmol/L, and rib external cortical bone phosphorus averaged 85 mg/mL, all consistent with severe chronic deficiency [1]. After 13 weeks of phosphorus supplementation, 18 of 20 cows recovered clinically and serum and bone phosphorus approached normal values [1].

### Vitamin D metabolism defects

Anything that reduces 25(OH)D or calcitriol production causes the same downstream problem. This includes chronic kidney disease, liver disease, and drugs that induce hepatic enzymes. Anticonvulsants such as phenytoin, carbamazepine and phenobarbital accelerate vitamin D catabolism and impair calcium absorption, producing anticonvulsant-induced osteomalacia with bone pain, muscle weakness and fracture risk [14]. Kidney transplant recipients can develop osteomalacia from persistent hyperparathyroidism, immunosuppression effects and severe vitamin D deficiency, with 25(OH)D as low as 7 ng/mL in a reported case [15][16].

### Phosphate wasting

Renal phosphate wasting is the second major mechanism. FGF23 excess causes X-linked hypophosphatemia and tumor-induced osteomalacia [8][9][10]. Renal tubular acidosis and Fanconi syndrome cause phosphate loss through tubular dysfunction [11][12]. In tumor-induced osteomalacia, serum phosphorus is markedly lower than in primary osteoporosis, and tubular maximum reabsorption of phosphate per glomerular filtration rate (TmP/GFR) is reduced, which is the biochemical signature that separates the two [9].

### Mineralization inhibitors

Hypophosphatasia results from reduced hydrolysis of inorganic pyrophosphate, a mineralization blocker, and produces osteomalacia with a distinct biochemical profile [4].

### Species-specific causes

- **Dogs:** Nutritional secondary hyperparathyroidism from all-meat or unbalanced diets, vitamin D deficiency, malabsorption, and renal disease.
- **Cats:** Obligate carnivores are vulnerable to vitamin D and calcium imbalance in poorly formulated homemade diets, and to chronic kidney disease.
- **Horses:** Phosphorus deficiency on poor pasture, oxalate-containing plants that bind calcium, and vitamin D deficiency in stabled animals with no sunlight.
- **Cattle:** Endemic phosphorus deficiency on native pasture is the dominant cause, as documented in subtropical grazing systems [1].
- **Reptiles:** Metabolic bone disease in captive reptiles is usually a combination of inadequate UVB exposure, low dietary calcium and inappropriate calcium-to-phosphorus ratio. The pathophysiology mirrors the mammalian axis.
- **Fish:** Dietary phosphorus deficiency produces hypomineralized bone in Atlantic salmon, a useful model of reversible osteomalacia [13].

## Comparative Table of Causes and Presentations

| Species | Common causes | Typical presentation | Key laboratory findings |
|--|--|--|--|
| Dog | Unbalanced diet, vitamin D deficiency, renal disease, malabsorption | Bone pain, lameness, reluctance to move, pathologic fractures | Low 25(OH)D, low or normal calcium, low phosphorus, high ALP |
| Cat | Poorly formulated homemade diet, chronic kidney disease | Stiff gait, bone pain, fractures, muscle weakness | Low 25(OH)D, variable calcium, high ALP |
| Horse | Phosphorus deficiency, oxalate plants, no sunlight | Shifting leg lameness, poor performance, rib fractures, swollen facial bones | Low phosphorus, normal or low calcium, high ALP |
| Cattle | Endemic pasture phosphorus deficiency | Ill thrift, stiff gait, lameness, fractures, poor growth | Low serum inorganic phosphorus, low bone phosphorus, normal to low calcium [1] |
| Reptile | No UVB, low dietary calcium, wrong calcium-to-phosphorus ratio | Soft jaw, rubbery long bones, kyphosis, inability to lift body | Low calcium, low or normal phosphorus, high ALP |
| Human | Vitamin D deficiency, calcium deficiency, phosphate wasting, anticonvulsants, renal disease | Diffuse bone pain, muscle weakness, waddling gait, fragility fractures | Low 25(OH)D, low phosphorus, high ALP, high PTH [14][2][17] |

## Reference Ranges for Key Analytes

Ranges vary by laboratory, age and species, and should always be interpreted against the reporting laboratory's own intervals. The following are representative adult values and are given to show the pattern, not to replace laboratory reference intervals.

| Analyte | Units | Dog | Cat | Horse | Cattle |
|--|--|--|--|--|--|
| Total calcium | mg/dL | 9.0 to 11.5 | 8.5 to 11.0 | 10.5 to 13.5 | 8.5 to 10.5 |
| Phosphorus | mg/dL | 2.5 to 6.0 | 2.5 to 6.0 | 2.0 to 4.5 | 4.0 to 7.0 |
| ALP | U/L | 10 to 150 | 10 to 90 | 100 to 350 | 20 to 500 |
| 25(OH)D | ng/mL | 30 to 100 | 30 to 100 | 20 to 50 | 20 to 50 |

In vitamin D deficiency osteomalacia, 25(OH)D is low, PTH and ALP are elevated, and calcium and phosphate fall as the disease progresses [2]. In hypophosphatemic forms, 25(OH)D may be normal while phosphorus and TmP/GFR are low [9]. In a reported case of severe vitamin D deficiency osteomalacia, calcium was 5.5 mg/dL, adjusted calcium 6.9 mg/dL, inorganic phosphorus 1.9 mg/dL, intact PTH 277.4 pg/mL, 1,25(OH)2D ≤4 pg/mL, 25(OH)D 11.0 ng/mL, and ALP 784 U/L, showing how far the axis can decompensate [17].

## Bone Changes and Histomorphometry

The microscopic signature of osteomalacia is excess osteoid. Bone histomorphometry, performed on a transiliac bone biopsy after tetracycline double labeling, quantifies this directly [3].

Key parameters include:

- **Osteoid volume** as a percentage of bone volume, which is increased.
- **Osteoid surface** as a percentage of bone surface, which is increased.
- **Osteoid seam width**, the mean thickness of unmineralized matrix along a surface, which is widened.
- **Mineral apposition rate**, derived from the distance between two tetracycline labels divided by the labeling interval, which is reduced.
- **Mineralization lag time**, the interval between osteoid deposition and its mineralization, which is prolonged.

Osteomalacia is classified by how these parameters relate to each other. When osteoid thickness and osteoid surface are both increased with a low mineral apposition rate, the defect is a mineralization defect. When osteoid is increased but apposition rate is normal or high, the picture suggests accelerated turnover [2].

Quantitative backscattered electron imaging adds a second dimension by measuring the distribution of mineral content across the bone. In osteomalacia the distribution shifts toward lower mineralization, and this can be detected even when radiographs look unremarkable [4]. Micro-computed tomography can identify defective mineralization adjacent to cement lines, areas of incomplete mineralization, and resorptive bays, which are three diagnostic features of osteomalacia [18].

The gross and radiographic changes follow from the histology. Soft bone deforms under load, so long bones bow, the vertebral column may compress, and the ribs and pelvis become vulnerable to fracture. In cattle with chronic phosphorus deficiency, cortical bone phosphorus is depleted, and rib external cortical bone phosphorus can be used as a herd-level indicator [1].

## Radiographic Findings

Radiographs in osteomalacia show generalized osteopenia, thinned cortices, and coarse trabecular patterns. The most specific finding is the **pseudofracture**, also called a **Looser zone**. This is a narrow band of unmineralized osteoid that crosses a bone perpendicular to its long axis, most often at the femoral neck, pubic rami, ribs or scapula. It is not a true fracture but a stress-related focus of incomplete mineralization. Looser zones were documented on imaging in a kidney transplant recipient with osteomalacia, alongside bone marrow edema and focal radiotracer uptake on technetium-99m MDP scintigraphy [15].

In growing animals, rickets adds growth plate changes: cupping, flaring and fraying of the metaphyses, widened physes and irregular provisional calcification zones [5][6].

## Clinical Relevance, Limitations and Common Mistakes

Osteomalacia is a treatable and often preventable disease when the underlying mineral or vitamin deficiency is corrected. In the cattle study, phosphorus supplementation reversed clinical signs in most affected cows within 13 weeks [1]. In salmon, nine weeks of adequate dietary phosphorus restored vertebral mineral content and mechanical properties [13]. These outcomes show that the osteoid that has accumulated can still mineralize once the supply problem is fixed.

The main limitation is that osteomalacia lacks distinctive non-invasive diagnostic criteria. Clinical signs are non-specific: fatigue, malaise, muscle weakness and bone pain [6]. Radiographic signs are limited, and bone density measurement cannot distinguish osteomalacia from osteoporosis or other metabolic bone diseases [3]. Definitive diagnosis often requires bone histomorphometry or quantitative backscattered electron imaging [4].

Common mistakes students and clinicians make:

1. **Calling every low bone density osteoporosis.** Low bone mineral density is a shared endpoint. Osteomalacia and osteoporosis need different tests to separate [3][9].
2. **Assuming normal serum calcium excludes osteomalacia.** In early vitamin D deficiency, calcium and phosphate can be normal while PTH, ALP and 1,25(OH)2D are elevated [2].
3. **Forgetting that rickets and osteomalacia coexist in the young.** A growing animal with rickets always has osteomalacia as well [5][6].
4. **Missing phosphate wasting because 25(OH)D is normal.** In FGF23-mediated disease, vitamin D status can look adequate while phosphate and TmP/GFR are low [9].
5. **Ignoring diet and sunlight history.** In captive reptiles and in dogs and cats on homemade diets, the history often provides the diagnosis.
6. **Treating bone pain as a primary orthopedic problem.** In metabolic bone disease the pain is diffuse and bilateral, not focal.

Individual cases require veterinary assessment, because the underlying cause determines whether the problem is dietary, renal, endocrine or drug-related.

## Quick Review

- Osteomalacia is defective mineralization of mature bone, with excess unmineralized osteoid.
- Rickets is the same defect at the growth plate in growing animals. Osteoporosis is low bone mass with normal mineralization.
- The vitamin D-calcium-phosphorus axis runs from 25(OH)D to calcitriol to intestinal absorption, with PTH and FGF23 as the main regulators.
- Low 25(OH)D, elevated PTH and ALP, and low calcium and phosphate are the classic biochemical pattern in nutritional osteomalacia.
- FGF23 excess and renal tubular disorders cause hypophosphatemic osteomalacia with phosphate wasting.
- Histomorphometry shows increased osteoid volume, increased osteoid surface, widened osteoid seams and prolonged mineralization lag time.
- Looser zones on radiographs are pseudofractures and are the most specific imaging finding.

## Frequently Asked Questions

### What is the difference between osteomalacia and rickets?

Osteomalacia is defective mineralization of mature bone, while rickets is the same mineralization defect affecting the growth plate and metaphysis of growing animals. Growing animals with rickets also have osteomalacia, but animals with closed growth plates can only develop osteomalacia [5][6].

### Can osteomalacia be reversed?

Yes, when the underlying mineral or vitamin deficiency is corrected. Phosphorus supplementation reversed clinical signs in most affected cows within 13 weeks [1], and adequate dietary phosphorus restored vertebral mineral content and mechanical properties in salmon within nine weeks [13].

### Why does low phosphorus cause soft bones?

Phosphate is a structural component of hydroxyapatite, the mineral crystal of bone. When phosphate supply to the mineralization front is inadequate, osteoid cannot be converted to mineralized bone, so unmineralized matrix accumulates and the bone becomes soft [13][4].

### What are Looser zones?

Looser zones, also called pseudofractures, are narrow bands of unmineralized osteoid that cross a bone perpendicular to its long axis. They appear on radiographs in osteomalacia and represent areas of incomplete mineralization rather than true fractures [15].

### Does osteomalacia affect serum calcium?

Serum calcium can be normal early in vitamin D deficiency osteomalacia because PTH compensates by increasing renal calcium reabsorption and bone resorption. As the disease progresses, hypocalcemia and hypophosphatemia develop with worsening secondary hyperparathyroidism [2].

### How is osteomalacia diagnosed when radiographs are normal?

Bone histomorphometry on a transiliac biopsy, often with tetracycline double labeling, quantifies osteoid volume, osteoid seam width and mineralization lag time. Quantitative backscattered electron imaging can detect low mineralization even when radiographs appear unremarkable [3][4].

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