Trendelenburg sign is a physical examination finding seen when assessing for any dysfunction of the hip. A positive Trendelenburg sign usually indicates weakness in the hip abductor muscles consisting of the gluteus medius and gluteus minimus. A positive sign is defined by a contralateral pelvic drop during a single leg stance. Named after a German surgeon, Friedrich Trendelenburg, the Trendelenburg sign was first described in 1897 to identify hip abductor weakness in individuals with congenital dislocation of the hip and progressive muscular atrophy.
Gogu S, Gandbhir VN. Trendelenburg Sign. [Updated 2022 Nov 14]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-.