| 摘要 |
A hip prosthesis ( 20 ) having a shell ( 22 ), liner ( 24 ), and retainer ring ( 26 ) is utilized for hip arthroplasty. The liner ( 24 ) fits inside the shell ( 22 ), which is attached to a patient's pelvis, and the retainer ring ( 26 ) engages a terminal liner margin ( 54 ) to inhibit expansion of and decrease the size of a restricted liner opening ( 72 ) defined by the liner margin ( 54 ). By inhibiting expansion of the liner opening ( 72 ), the ball ( 92 ) of a patient's femur ( 90 ) is securely held in the liner ( 24 ). In one embodiment, the liner ( 98 ) is inhibited from rotation relative to the shell ( 96 ) by a plurality of protrusions ( 106 ) which mate with recesses ( 102 ) in the shell ( 96 ). In that embodiment, the liner ( 98 ) is provided with catch lips ( 108 ) to hold the liner ( 98 ) in the shell ( 96 ) and a positioning flange ( 110 ) which operates to form a relief gap ( 120 ) between the shell ( 96 ) and the liner ( 98 ). In another embodiment, the retainer ring comprises an attachment portion ( 128 ) and a retainer portion ( 130 ) with a threaded connection ( 132 ) between the attachment portion ( 128 ) and the retainer portion ( 130 ).
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