Trendelenburg Sign
Pronunciation: TREN-deh-len-berg
A clinical finding indicating weakness of the hip abductors (gluteus medius) on the stance limb, observed when the contralateral pelvis drops during single-leg stance.
Full Definition
The Trendelenburg sign is a key physical examination finding and gait observation recorded in PM&R, orthopaedic, and neurological documentation. A positive Trendelenburg sign occurs when the pelvis tilts downward on the unsupported (swing) side during weight-bearing on the opposite limb, revealing insufficient hip abductor strength or neuromuscular control. Editors should note the eponym is capitalised (Trendelenburg) as it derives from the German surgeon Friedrich Trendelenburg. The associated compensatory gait pattern is called 'Trendelenburg gait' or, in its bilateral form, a 'waddling gait.' Do not confuse the Trendelenburg sign with the Trendelenburg position, which refers to a supine patient tilted head-down.
Usage
Usage note: Always capitalise 'Trendelenburg.' The phrase 'positive Trendelenburg sign' is preferred in clinical documentation over 'Trendelenburg positive.' Do not abbreviate this eponym in formal reports.
In Context
- "The physiatrist documented a positive Trendelenburg sign on the left, consistent with gluteus medius weakness following hip arthroplasty." — Physiatric consultation note
- "Gait analysis revealed a Trendelenburg sign bilaterally, prompting referral for strengthening of the hip abductors." — Gait analysis report