Fibrotic Myopathy & Contracture
This page is for educational purposes only and is not a substitute for veterinary diagnosis or emergency care. Always consult your primary veterinarian or a rehabilitation veterinarian before starting treatment. If your pet cannot walk, has sudden paralysis, severe pain, or breathing difficulty, seek urgent veterinary attention.
What is Fibrotic Myopathy & Contracture?
Also known as: muscle contracture; fibrotic contracture; infraspinatus contracture; quadriceps contracture (post-injury/cast related).
When muscle fibres are replaced by dense fibrous tissue, the muscle can no longer lengthen adequately through the joint’s range. Classic canine examples include infraspinatus contracture (forelimb held in characteristic rotation/abduction patterns) and quadriceps contracture after femoral fractures or prolonged immobilisation — a serious complication in young dogs. Gracilis fibrotic myopathy is another regional pattern.
Contractures limit function, create secondary joint stress, and may be painful at end range. Prevention during fracture care (early controlled motion when allowed) is far better than treating established fibrosis. Established cases may need surgical release plus intensive rehab.
Rehabilitation maintains gains after release, improves compensatory mechanics, and in milder or early cases may slow progression and preserve function with dedicated soft-tissue and exercise programmes.
Common signs to watch for
Signs vary by severity and by whether your pet is a dog or cat. Owners of dogs often notice:
- Fixed or markedly restricted joint motion compared with the other side
- Characteristic gait changes (e.g., circumduction, abnormal foot placement)
- Palpable taut, non-pliable muscle band
- Difficulty sitting squarely or advancing the limb
- History of fracture, casting, or intramuscular injection in some contracture types
- Secondary pain in compensating joints and the spine
Causes & contributing factors
- Fibrotic replacement after muscle trauma or ischaemia
- Prolonged immobilisation (casts/splints) especially in growing dogs — quadriceps risk
- Specific syndromes such as infraspinatus or gracilis fibrotic myopathy
- Post-injection or infectious myositis sequelae (less common)
- Incomplete rehabilitation after injury allowing adaptive shortening
How veterinary rehabilitation helps
For early or mild restriction, frequent gentle range-of-motion, soft-tissue work, and functional exercise aim to preserve extensibility.
After surgical release, intensive rehab is critical: early controlled motion per surgeon protocol, scar management, strengthening, and gait re-education to reduce recurrence.
Owners become partners in high-frequency home mobility work — consistency matters more than occasional aggressive stretching.
Rehabilitation plans at RehabVet are individualised after a veterinary assessment. We coordinate with your primary vet when imaging, medication, or surgery is part of the overall plan.
Modalities & services commonly used at RehabVet
Depending on your pet’s examination findings, comfort, and goals, a plan may include one or more of the following:
Expected rehabilitation goals
Goals are set for the individual patient. Typical aims may include (not guarantees — outcomes vary):
- Maximise available pain-free range of motion
- Improve functional gait despite residual restriction when present
- Protect against recurrence after surgical release
- Strengthen synergistic muscles that share the restricted muscle’s roles
- Educate on prevention after fractures and casting
We do not publish invented success percentages. Progress is tracked clinically (gait, strength, range of motion, pain behaviours, and home function) and plans are adjusted over time.
When to seek veterinary care
- Any rapid loss of joint motion after fracture treatment — urgent orthopaedic review
- Young dogs in casts with reluctance to use the limb — early check for quadriceps contracture risk
- Progressive characteristic gait change with a tight muscle band
- Post-release surgery — enrol in guided rehab promptly
- Can contracture be stretched out at home?
Forceful stretching of established fibrosis is often ineffective and can cause pain or joint injury. Follow a veterinary rehab plan; some cases need surgery plus structured therapy.
- Why are young dogs at risk after femoral fractures?
Quadriceps contracture can develop when the stifle is kept extended and the limb unused. Modern fracture care emphasises early controlled use when stable — ask your surgeon about rehab timing.
- Is fibrotic myopathy the same in cats?
These classic fibrotic myopathy syndromes are primarily described in dogs. Cats can develop stiffness after injury or casting and still need prompt veterinary and rehab attention.
Related reading & patient stories
Book a rehabilitation assessment
If your pet has been diagnosed with Fibrotic myopathy, or you are noticing mobility changes, our team can assess and design a multimodal rehab plan.
Educational content only — not a diagnosis. For emergencies, contact your nearest veterinary hospital.