Relationship between Patellar Height and Range of Motion after Total Knee Arthroplasty

UNLABELLED To evaluate whether, after total knee arthroplasty, there is any correlation between patellar height and range of motion (ROM) achieved by patients six months after the operation. METHODS Forty-five patients who underwent total knee arthroplasty were assessed at least 12 months after the operation (total of 54 knees). The maximum and minimum ROM of all the knees was recorded under fluoroscopy, along with patellar height according to the Blackburne and Peel ratio. Two possible correlations were evaluated: patellar height and ROM; and patellar height and ROM variation from before to after the operation. RESULTS A correlation was found between patellar height and postoperative ROM (p = 0.04). There was no correlation between patellar height and ROM variation (p = 0.182). CONCLUSION After total knee arthroplasty, the lower the patella is, the worse the ROM is.