The Effect of a Medial Collar on the Initial Stability of a Cementless Primary Femoral Hip Prosthesis
Date of Award
Paul J. Rullkoetter
Femoral hip prosthesis, Stability, Bioengineering
The initial stability of a primary femoral hip prosthesis is important to the long-term survivorship and efficacy of the prosthesis. In the absence of adequate initial stability, micromotion between the prosthesis and the proximal endosteal femoral bone will result in partial fibrous encapsulation of the prosthesis, rather than direct bony apposition. Long-term survivorship of the prosthesis may suffer as a result of the lack of long-term osteointegration due to early prosthesis instability. The present study demonstrates the effect of a medial collar on the initial stability of a triple-tapered, broach-only, proximally porous-coated primary cementless hip prosthesis using a computational analysis. In a computer model, collared and collarless prostheses are placed into six femora from six different patients and subjected to two separate loading conditions encountered daily. The presence of a medial collar was found to produce a significant reduction in the total micromotion and subsidence of the femoral hip prosthesis.
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Huff, Daniel N., "The Effect of a Medial Collar on the Initial Stability of a Cementless Primary Femoral Hip Prosthesis" (2012). Restricted Access ETDs. 55.
Received from author
Daniel N. Huff