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Posterior inferior
5%
95/1983
Anterior superior
16%
325/1983
Posterior superior
76%
1512/1983
Directly superior
2%
34/1983
Anterior inferior
1%
10/1983
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Figure A is an AP radiograph of a hip hemiarthroplasty. Contact pressures from an insturmented hip endoprosthesis can have important implications in both implant positioning and rehabilitation protocols. Hodge et al implanted a pressure-measuring Moore-type endoprosthesis in a patient who had sustained a displaced fracture of the femoral neck. They used this prosthesis to determine the measurement and telemetry of contact pressures in the hip for 36 months post-operatively. The highest pressure, eighteen megapascals, was recorded while the patient was getting up from a chair using the affected leg and was localized in the posterior superior portion of the acetabulum. This can be important in the post-operative care of acetabular fractures, as patients are at increased risk of loss of fixation with greater acetabular contact forces. Interestingly, peak pressures in vivo were found to be considerably higher than previously measured pressures in vitro. Incorrect Answers: 1,2,4,5,-These regions of the acetabulum have less contact pressure compared to the posterior superior portion.
3.7
(30)
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