Abstract
Hybrid total knee arthroplasty (TKA) with an uncemented femoral component and a cemented tibial and patellar component has been performed to avoid the problems associated with uncemented fixation. We assessed the clinical results and radiographic features of 56 hybrid cruciate retaining TKAs with an average follow-up of 27 months. The mean age at surgery was 75 years. Range of motion and JOA score were evaluated clinically. The Knee Society roentgenographic evaluation system was used for radiological assessment.
The mean JOA score improved from 59.2 points preoperatively to 81.7 points postoperatively. One knee was revised due to septic loosening of the tibial component. No revisions were performed for aseptic loosening of the femoral component. The component position and alignment were approximately as planned preoperatively and were maintained until the final follow-up. An initial gap around the femoral component was noted in 11 knees (19.6%) and remained in 6 knees (10.6%) at the final follow-up. Radiolucent lines were noted in 23 knees (41.1%) on the medial side of the tibia. All radiolucent lines were less than 2 mm in width and showed no progression.
Hybrid TKA provides good results in selected cases. A longer follow-up is required to determine the advantages of hybrid TKA in terms of clinical outcome.
