Zusammenfassung
Implant positioning and knee alignment are two primary goals of successful unicompartmental knee arthroplasty. This prospective study outlines the radiographic results following 32 patient-specific unicompartmental medial resurfacing knee arthroplasties. By means of standardized pre- and postoperative radiographs of the knee in strictly AP and lateral view, AP weight bearing long leg images as ...
Zusammenfassung
Implant positioning and knee alignment are two primary goals of successful unicompartmental knee arthroplasty. This prospective study outlines the radiographic results following 32 patient-specific unicompartmental medial resurfacing knee arthroplasties. By means of standardized pre- and postoperative radiographs of the knee in strictly AP and lateral view, AP weight bearing long leg images as well as preoperative CT-based planning drawings an analysis of implant positioning and leg axis correction was performed.The mean preoperative coronal femoro-tibial angle was corrected from 7 degrees to 1 degrees (p<0.001). The preoperative medial proximal tibial angle of 87 degrees was corrected to 89 degrees (p<0.001). The preoperative tibial slope of 5 degrees could be maintained. The extent of the dorsal femoral cut was equivalent to the desired value of 5 mm given by the CT-based planning guide. The mean accuracy of the tibial component fit was 0 mm in antero-posterior and + 1 mm in medio-lateral projection. Patient-specific fixed bearing unicompartmental knee arthroplasty can restore leg axis reliably, obtain a medial proximal tibial angle of 90 degrees, avoid an implant mal-positioning and ensure maximal tibial coverage. (C) 2010 Elsevier B.V. All rights reserved.
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