Biceps Tenosynovitis
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 Biceps Tenosynovitis?
Also known as: bicipital tenosynovitis; biceps tendonitis; medial shoulder syndrome component (when part of a broader shoulder instability picture).
The biceps brachii tendon runs through the intertubercular groove of the humerus, stabilised by a transverse ligament and surrounded by a synovial sheath. Repetitive overhead activity, trauma, or concurrent shoulder pathology can irritate the tendon–sheath complex, producing pain on shoulder flexion and biceps tests during orthopaedic exam.
Dogs may present with weight-bearing forelimb lameness that worsens after activity, shortened reach, or reluctance to jump down. Differentials include other medial shoulder injuries, osteoarthritis, neurological disease, and elbow pathology — careful localisation is essential.
Management may include activity modification, anti-inflammatory strategies as prescribed, intra-articular or sheath-directed veterinary treatments in selected cases, and structured rehabilitation. Surgery is reserved for specific structural failures.
Common signs to watch for
Signs vary by severity and by whether your pet is a dog or cat. Owners of dogs often notice:
- Forelimb lameness, often worse after exercise
- Shortened cranial reach of the stride
- Pain on shoulder manipulation; positive biceps stress tests on exam
- Reluctance to jump down from height or play roughly
- Muscle atrophy over the shoulder with chronicity
- Possible concurrent medial shoulder instability signs
Causes & contributing factors
- Repetitive strain from jumping, agility, or high-drive play
- Acute trauma to the shoulder
- Concurrent medial shoulder ligament/tendon injury
- Degenerative change within the biceps tendon complex
- Compensatory overload from contralateral or hind-limb disease
How veterinary rehabilitation helps
Initial rehab reduces provocative loading (repetitive jumping, rough tugging) while maintaining mobility of the scapulothoracic region and elbow.
Progressive strengthening of the rotator-cuff analogues, scapular stabilisers, and core redistributes load away from the irritable biceps complex. Manual therapy and modalities support comfort.
Return to sport includes graded jumping progressions and technique review with handlers of athletic dogs.
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):
- Settle shoulder pain and functional lameness
- Restore comfortable shoulder range and stride length
- Strengthen peri-articular and scapular support muscles
- Address concurrent shoulder instability contributors when present
- Stage return to jumping and sport-specific tasks
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
- Forelimb lameness lasting more than a few days
- Yelping when the shoulder is touched or when landing from jumps
- Acute non-weight-bearing forelimb lameness after trauma
- Recurring shoulder lameness in a sporting dog — full shoulder work-up
- Is biceps tenosynovitis only a sporting-dog problem?
It is well recognised in athletic dogs but can affect any dog that jumps, slips, or compensates for other pain. Companion dogs are not exempt.
- Will laser or ultrasound alone fix it?
Modalities may help comfort as part of a plan, but lasting improvement usually requires load management and progressive strengthening — not passive treatments alone.
- Can cats get biceps tenosynovitis?
Shoulder soft-tissue injuries are less commonly diagnosed in cats than dogs, but forelimb lameness in cats still warrants veterinary examination to exclude fracture, joint, and neurological causes.
Related reading & patient stories
Book a rehabilitation assessment
If your pet has been diagnosed with Biceps tenosynovitis, 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.