The cotyloid ligament is an older anatomical term for the acetabular labrum as a whole, encompassing the complete fibrocartilaginous ring that deepens and seals the acetabular socket.
The complete fibrocartilaginous seal of the acetabulum — deepens the socket, seals joint fluid, distributes contact forces, and provides the attachment for the hip capsule around the acetabular margin.
In total hip arthroplasty, the cotyloid ligament (labrum) is routinely excised to allow accurate acetabular cup placement and complete reaming to the acetabular floor. Labral preservation in hip resurfacing attempts to maintain this structure for improved stability.
Routine labral excision during total hip arthroplasty to allow accurate cup placement and complete bone contact between the cup and acetabular floor.
Preservation of the cotyloid ligament (labrum) during hip resurfacing arthroplasty to maintain the capsulolabral complex and reduce dislocation risk.
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