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Journal of Bone and Joint Surgery - British Volume, Vol 87-B, Issue 11,
1502-1506.
doi: 10.1302/0301-620X.87B11.16586 Copyright © 2005 by British Editorial Society of Bone and Joint Surgery Osteolysis in a surface-cemented, primary, modular Freeman-Samuelson total knee replacementJ. Arora, MRCS, MS, Clinical Research Fellow1; and A. C. Ogden, FRCS, Consultant Orthopaedic Surgeon2
1 Department of Trauma and Orthopaedics, North Tyneside General Hospital, Rake Lane, North Shields, Northumbria NE29 8NH, UK. Correspondence should be sent to Mr J. Arora at 225 Addycombe Terrace, Heaton, Newcastle upon Tyne NE6 5TY, UK; e-mail: arorajayant{at}yahoo.com
We analysed at a mean follow-up of 7.25 years the clinical and radiological outcome of 117 patients (125 knees) who had undergone a primary, cemented, modular Freeman-Samuelson total knee replacement. While the tibial and femoral components were cemented, the patellar component was uncemented. A surface-cementing technique was used to secure the tibial components. A total of 82 knees was available for radiological assessment. Radiolucent lines were seen in 41 knees (50%) and osteolytic lesions were seen in 13 knees (16%). Asymptomatic, rotational loosening of the patellar implant was seen in four patients and osteolysis was more common in patients with a patellar resurfacing. Functional outcome scores were available for 41 patients (41 knees, 35%) and the mean Western Ontario McMasters Universities score was 77.5 (SD 19.5) and the cumulative survival was 93.4% at ten years with revision for aseptic loosening as an endpoint. Increased polyethylene wear from modular components, a rotationally-loose patella, and the surface-cementing technique may have contributed to the high rate of osteolysis seen in our study.
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