Physical performance parameters during standing up in patients with unilateral and bilateral total knee arthroplasty

Abstract

The aim of this study was to compare quadriceps femoris muscle performance parameters of patients who underwent unilateral and bilateral total knee arthroplasty (TKA). The study included 80 patients. Thirty-five underwent unilateral primary TKA (35 females; mean age: 67.11 ± 3.97 years) and 45 underwent bilateral primary TKA (2 males, 43 females; mean age: 67.12 ± 7.32 years). Patients were evaluated in terms of performance parameters including stand-up time, rising index, standing postural sway velocity, and symmetries of body weight distribution on the extremities while standing up using a Balance Master® balance and performance instrument in the postoperative 6th and 12th month. No significant difference was determined in body weight symmetry ratios between the operated and non-operated extremity in unilateral TKA patients in the 6th and 12th month sit-to-stand test (p>0.05) whereas there was a significant difference in bilateral TKA patients (p<0.05). There was no significant difference between unilateral and bilateral TKA patients in terms of time needed for standing up, rising index and gravity sway velocity at the postoperative 6th month and 12th month (p>0.05). Bilateral TKA patients stood up in a shorter time than unilateral TKA patients (p<0.05) although the degree of body sway was higher after standing up (p<0.05). Bilateral TKA patients should be encouraged to focus on exercises with non-dominant limbs and to use them more while physiotherapy and rehabilitation programs including physical performance activities are planned.