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Internal rotation of femoral component significantly decreased functional activity scores
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Patients who underwent primary posterior cruciate ligament-substituting total knee arthroplasty and experienced internal rotation of the femoral component had significantly decreased functional activity scores, according to study results.
Researchers included 75 Japanese patients who underwent primary posterior cruciate ligament-substituting total knee arthroplasty (TKA) and answered a questionnaire containing all patient-derived components of the 2011 Knee Society Knee Scoring System in the study. All of the patients had full leg-length CT scans both preoperatively and postoperatively.
The researchers measured postoperative hip-knee-ankle angle on CT images, as well as postoperative rotational alignments of femoral and tibial components, before classifying patients into three groups (normal rotation, external rotation and internal rotation) based on rotational malalignment of 3°.
Results showed patients in the femoral component internal rotation group experienced significantly lower functional activity scores compared with patients in the femoral component normal rotation group. Patients in the femoral component internal rotation group also had lower satisfaction scores compared with patients in the femoral component normal rotation group; however, the between-group difference was not significant, according to the researchers.
The researchers also found patients in the femoral component internal rotation group had significantly lower standard activity and advanced activity scores vs. the femoral component normal rotation group.
Disclosure: The authors have no relevant financial disclosures.
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