Iliopsoas Strain
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 Iliopsoas Strain?
Also known as: iliopsoas myopathy; hip flexor strain; iliopsoas tendinopathy (when the tendon insertion is involved).
The iliopsoas muscles flex the hip and stabilise the lumbar–pelvic region. They are vulnerable during explosive acceleration, slippery turns, aggressive play, or when dogs compensate for other orthopaedic pain (stifle, hip, or lumbosacral disease). Injury ranges from mild fibre strain to more significant tears near the lesser trochanter insertion.
Dogs may show intermittent hind-limb lameness that worsens after rest or activity, shortened stride, or pain when the hip is extended with internal rotation on exam. Ultrasound or advanced imaging may be used when the diagnosis is unclear or to grade severity.
Rehabilitation is often first-line for uncomplicated strains: relative rest from aggravating sport, graded flexibility and eccentric/strength work, soft-tissue therapy, and correction of contributing biomechanics. Return-to-sport is staged to reduce re-injury.
Common signs to watch for
Signs vary by severity and by whether your pet is a dog or cat. Owners of dogs often notice:
- Intermittent or activity-related hind-limb lameness
- Shortened stride; stiffness after rest (“warm-up” lameness pattern can vary)
- Pain on hip extension or when rising from lying
- Reluctance to jump into cars or onto furniture
- Performance decline in sporting dogs (weave poles, jumping, abrupt turns)
- Compensatory lumbar or contralateral limb strain over time
Causes & contributing factors
- Acute overstretch or eccentric overload of the hip flexors
- Repetitive microtrauma in agility, flyball, or high-drive play
- Slippery flooring and uncontrolled deceleration
- Compensation for cruciate disease, hip dysplasia, or lumbosacral pain
- Inadequate warm-up or sudden spikes in training load
How veterinary rehabilitation helps
Early care calms irritable muscle and tendon tissue with activity modification, manual therapy, and modalities selected for comfort. Stretching is introduced carefully — aggressive end-range stretching into pain can delay healing.
Progressive loading rebuilds tensile capacity: controlled hip-flexor and core strengthening, proprioception, and gait retraining. Hydrotherapy allows conditioning with less impact when land work is provocative.
Therapists screen for concurrent orthopaedic disease so the iliopsoas is not treated in isolation when it is a secondary compensator.
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):
- Reduce pain and reactive spasm in the iliopsoas and lumbar region
- Restore pain-free hip extension and stride length
- Rebuild strength and load tolerance of the hip flexors
- Correct contributing biomechanics and training errors
- Stage a durable return to sport or normal play
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
- Persistent hind-limb lameness lasting more than a few days
- Yelping with hip extension or refusal to jump
- Acute non-weight-bearing lameness after trauma — rule out fracture or cruciate injury
- Recurring “mystery” lameness in a sporting dog — full orthopaedic and rehab assessment
- Can iliopsoas strain be mistaken for a cruciate tear?
Yes. Both can cause hind-limb lameness. A veterinary orthopaedic exam (and imaging when needed) distinguishes stifle instability from hip-flexor pain. Treating only the muscle when the stifle is unstable delays proper care.
- Should I stretch my dog’s hip aggressively at home?
No. Forced end-range stretching into pain can worsen strains. Follow a rehab-prescribed programme of gentle mobility and progressive strengthening instead.
- Do cats get iliopsoas strains?
Hip-flexor injury is discussed far more in dogs. Cats can strain muscles, but they often hide lameness; any persistent mobility change still needs veterinary assessment.
Related reading & patient stories
Book a rehabilitation assessment
If your pet has been diagnosed with Iliopsoas strain, 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.