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Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_2 | Pages 13 - 13
1 Jan 2016
Grosser D Benveniste S Bramwell D Krishnan J
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Background

Radiostereometric Analysis (RSA) is an accurate measure of implant migration following total joint replacement surgery. Early implant migration predicts later loosening and implant failure, with RSA a proven short-term predictor of long-term survivorship. The proximal migration of an acetabular cup has been demonstrated to be a surrogate measure of component loosening and the associated risk of revision. RSA was used to assess migration of the R3 acetabular component which utilises an enhanced porous ingrowth surface. Migration of the R3 acetabular component was also assessed when comparing the fixation technique of the femoral stems implanted.

Methods

Twenty patients undergoing primary total hip arthroplasty were implanted with the R3 acetabular cup. The median age was 70 years (range, 53–87 years). During surgery tantalum markers were inserted into the acetabulum and the outer rim of the polyliner. RSA examinations were performed postoperatively at 4 to 5 days, 6, 12 and 24 months. Data was analysed for fourteen patients to determine the migration of the acetabular cup relative to the acetabulum. Of these fourteen patients, six were implanted with a cementless femoral stem and eight with a cemented femoral stem. Patients were clinically assessed using the Harris Hip Score (HHS) and Hip Disability and Osteoarthritis Outcome Score (HOOS) preoperatively and at 6, 12 and 24 months postoperatively.


Orthopaedic Proceedings
Vol. 98-B, Issue SUPP_4 | Pages 37 - 37
1 Jan 2016
Stevens A Surabhi R Jaarsma R Bramwell D Krishnan J
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Introduction & aims

Different racial groups show variations in femoral morphometry. Femoral anteroposterior measurement and mediolateral measurement are key variables in designing femoral implant for TKR. Their aspect ratio determines the shape and mediolateral sizing for the proper patellofemoral tracking and uniform stress distribution over the resected distal femoral surface.

Method

We reviewed the current literature in December 2013 in common medical databases including the Cochrane Library, PubMed and Medline. Keywords included combinations of: Anthropometry, Knee, Arthroplasty, Femur, Morphometry, Geometry. We selected papers including femoral morphometric data collected from populations of different ethnic origins. Papers covered populations in the USA, China, Germany, Thailand, Korea, India, Japan and Malaysia.