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Obturator Nerve Articular Branch

ramus articularis nervi obturatorii

The obturator nerve articular branch is the most distal branch of the obturator nerve, arising within the adductor compartment of the thigh and sending sensory fibres to the medial knee joint capsule, the anteromedial knee, and the deep medial thigh structures. This articular branch is the anatomical basis of Hilton's law (a joint receives innervation from the nerves supplying the muscles acting on the joint) and explains the referred knee pain from hip pathology.

Region: Pelvis & Hip

Clinical Relevance

Clinical Notes

The obturator articular branch is the anatomical explanation for referred knee pain as the presenting symptom of hip pathology, particularly in children with Perthes disease, SCFE, and hip septic arthritis. The referred pain follows the obturator articular branch from the hip to the medial knee. Clinicians who examine only the knee in a child with apparent knee pain will miss the true hip pathology. The obturator nerve articular branch is also the target for selective genicular nerve blocks when the medial capsular contribution to knee pain is addressed in multimodal knee pain management.

Pathology

Common Injuries & Conditions

Referred Knee Pain from Hip Disease via Obturator Articular Branch

Hip pathology from Perthes disease, SCFE, or septic arthritis produces medial knee pain via the obturator nerve articular branch in children, mimicking primary knee pathology; failure to examine the hip in any child with knee pain risks missing the diagnosis, and the hip must be assessed with log-roll testing and internal rotation range before pursuing knee investigations.