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General Orthopaedics

A 5–8 YEAR RETROSPECTIVE FOLLOW-UP OF THE C-STEM AMT FEMORAL COMPONENT: PATIENT REPORTED OUTCOMES AND SURVIVORSHIP ANALYSIS FROM A NON-DEVELOPER CENTRE

The South West Orthopaedic Club (SWOC) Autumn Meeting



Abstract

Triple-tapered cemented stems were developed in the hope that they would reduce aseptic loosening and prevent calcar bone loss.

Between March 2005 and April 2008, a consecutive series of 415 primary C-stem AMT hip arthroplasties in 386 patients were performed under the care of three surgeons at our institution. When all the patients had reached the 5-year anniversary of surgery, functional questionnaires were sent out by mail. In the event of non-response, reminders were sent by post before the patients were contacted by telephone. Postoperative radiographs were also reviewed.

Follow-up ranges from 60 to 99 months, with a mean of 76 months. 32 hips (8%) were lost to follow-up. The median OHS was 40, median SF-12 mental component score (MCS) was 50, and median SF-12 physical component score (PCS) was 39. Radiographic review showed that aseptic femoral component loosening has yet to be observed. At 99 months follow up, stem survivorship is 96.9% (95% confidence interval (CI) 82.5 to 99.5). Adverse events such as calcar fracture, greater trochanter fracture and dislocation were rare at <1%.

The C-stem AMT demonstrates excellent implant survivorship at 5–8 year follow-up, as well as good midterm functional outcome.