AI Article Synopsis
- The study evaluated a new acetabular liner locking design for its retention strength and durability, focusing on its geometric and machining features to reduce motion and debris.
- Testing showed that the modified liners had a static pullout strength of about 399 N and maintained their strength after 10 million cycles of cyclic loading without significant wear.
- The locking mechanism effectively prevented particle access between the liner and joint space, suggesting that it provides reliable stability comparable to existing designs in real-life applications.
Article Abstract
Acetabular liner retention of a novel design of liner locking was evaluated in static and cyclic endurance modes. The locking mechanism combines geometric form and accurate machining to give high conformity to the acetabular shell and minimise relative motion against the metal shell, minimising debris generation and escape or ingress. Using amended test liners with integral coupling, mean static pullout strength was determined to be 399+/-53 N and lever-out strength 28.03+/-2.8 N m. Cyclic loading of 5 N m for up to 10 million cycles caused no significant reduction in strength, no detectable fretting wear, and the sealing mechanism prevented particle access between the cup interior and the "effective joint space". The stability measured ensures secure and reliable in vivo retention of the liner, comparable with extant component designs using other liner locking mechanisms.
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| http://dx.doi.org/10.1016/s1350-4533(03)00112-7 | DOI Listing |
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