Follow up on uncemented total knee arthroplasty

Follow up data on 42 uncemented total knee arthroplasty patients were examined at an average follow-up period of 5 to 7 years. The prosthetic components were examined clinically using the modified Hospital for Special Surgery knee rating system and radiographically using fluoroscopically guided radiographs. When compared to the preliminary report, the knee rating score dropped from an average of 94 to 78, with most of the poor results due to patellar failure requiring revision. As in our preliminary study, complications centered on the metal-backed patellar component. Revision of the patellar component was required in 19 of 42 knees (45%). Three of 42 (7%) tibial components required revision, and 2 of 42 (5%) femoral components were revised. Interface lucencies were examined and changes were documented. Other complications included osteolysis in 4 of 42 (10%), bent patellar component in 3 of 42 (7%), and loose titanium mesh (5%).