Effects of posterior tibial osteotomy inclination angle during total knee arthroplasty on postoperative range of motion and function

Objective To investigate the effects of different posterior tibial osteotomy inclination angles on postoperative range of motion and function in patients after total knee arthroplasty. Methods Totally 101 cases of patients undergoing total knee arthroplasty were selected,including 50 cases used 5° posterior tibial osteotomy inclination angle( observation group) and 51 cases used that of 0°( control group). The patients in the two groups received the calf standard X-ray examination positively and laterally before and 6 months after surgery,then we measured the tibial angle,tilt angle after tibia,knee joint line height,maximum knee extension and flexion angles. The knee joint HSS score of the two groups was recorded before and at 4,12 weeks of treatment and the complications after 6-month treamtment. Results The tibia angle,joint line height and maximum extension angle of the two groups after 6-month treamtment were decreased as compared with those before treatment. The posterior tibial slope angle,maximum flexion angle were all increased,and HSS scores were increased after 4 and 12 weeks of treatment. The above changes of the observation group were more significant than those of the control group( all P 0. 01). The incidence of complications such as tibial plateau backward,shift down of patellar tendon,delayed fracture healing and severe abrasion of implant in the observation group was lower than that of the control group( all P 0. 05). Conclusion During total knee arthroplasty,using 5° posterior tibial osteotomy inclination angle can improve the postoperative range of motion and function in patients after surgery,and its efficacy and safety is better than that of 0°.