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2. The Mac Keever patellar prosthesis in femoro-patellar arthrosis;Vermeulen;Acta Orthop Belg,1973
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4. Development and early results of a new patellofemoral arthroplasty;Ackroyd;Clin Orthop Relat Res,2005
5. Patellofemoral arthroplasty. A three- to nine-year follow-up study;Arciero;Clin Orthop Relat Res,1988