Bicipital Tenosynovitis in Dogs: Shoulder Pain Without a Fracture

Bicipital tenosynovitis in dogs is inflammation involving the tendon of origin of the biceps brachii muscle and its sheath near the shoulder joint. The tendon glides through a groove in the upper humerus and contributes to stability and movement of the front limb. When repetitive strain, degeneration, or trauma affects it, a dog may become lame without an obvious fracture or wound.

Adult, active, medium- and large-breed dogs are commonly represented, although the condition is not limited to this group. Running, jumping, rapid changes of direction, and repetitive movements may contribute. In other cases, inflammation occurs alongside shoulder instability, injury to other tendons, or joint disease. Diagnosis therefore should not stop as soon as tenderness is found over the biceps region.

Lameness may be mild at first, worsen after exercise, and improve with rest. The dog may shorten the forward reach of the limb, avoid full weight-bearing, or show pain when the shoulder is extended while the elbow remains straight. Some dogs resist climbing steps, getting into a car, or playing fetch. Compensatory gait can lead to neck tension and overload of the opposite limb.

During the examination, the veterinarian palpates the bicipital groove and performs movements designed to selectively tension the tendon. Interpretation requires experience because pain arising from the shoulder, elbow, or cervical spine may produce similar responses. Comparing both limbs, assessing muscle mass, and checking reflexes helps distinguish orthopedic from neurological causes. Pain elsewhere in the paw or limb can also alter weight-bearing.

Radiographs may show tendon mineralization, bone irregularities, or osteoarthritis, but changes can be subtle in some dogs. Ultrasound can reveal thickening, fluid within the tendon sheath, and disruption of the normal fiber pattern. In selected cases, magnetic resonance imaging, arthroscopy, or a guided diagnostic injection may help confirm the source of pain. No single finding should be interpreted in isolation.

Treatment depends on the duration and severity of the condition. Cases without a major tear may respond to activity modification, pain management, and progressive rehabilitation. Veterinary physical therapy aims to restore motion without irritating the tendon, strengthen shoulder stabilizers, and address compensation. Injections or surgery may be considered when pain persists, after weighing risks, concurrent disease, and the patient's functional goals.

Rest should mean restricting activities that provoke the injury, not returning to full-speed running as soon as the limp improves. Tendons heal more slowly than many tissues because of their blood supply and organization. A rushed return may turn early improvement into recurrence. Progression usually begins with controlled leash walks and advances only when examination shows comfort and stability.

Bicipital tenosynovitis is treatable, but the outcome depends on recognizing the complete pattern of shoulder disease. If front-limb lameness lasts for weeks, worsens after exercise, or returns whenever activity resumes, the biceps tendon and relevant differential diagnoses should be investigated. Avoid human anti-inflammatory drugs and improvised exercises, as both can mask signs or worsen the injury.

Bibliographic reference: Stobie, D.; Wallace, L. J.; Lipowitz, A. J.; King, V.; Lund, E. M. Chronic bicipital tenosynovitis in dogs: 29 cases (1985-1992). Journal of the American Veterinary Medical Association, v. 207, n. 2, p. 201-207, 1995.

Bibliographic reference: Fossum, T. W. Small Animal Surgery. 5th ed. Elsevier, 2019.