Clinical effect of the treatment of patella fracture with the polymeric patella ring device

Objective To investigate the clinical effect of the treatment of patella fracture with the polymeric patella ring device. Methods A retrospective study was performed on 39 cases of patients with patella fracture who were admitted from June 2016 to August 2019.According to the different surgical methods, patients were divided into the polymeric patella ring device group(n=20)and tension band group(n=19), 25 males and 14 females, aged(41±22)years, ranging from 19 to 63 years.The range of motion of knee joint, clinical healing time and the loss of flexion function were compared between the two groups at 4, 8 and 12 weeks after surgery. Results The range of motion of knee flexion angles[(90.0°±13.2°), (110.0°±8.3°)and(120.0°±9.0°)]at 4, 8 and 12 weeks after surgery of polymeric patella ring device group was better than that of the tension band group[(74.0°±10.5°), (89.0°±10.5°)and(105.0°±10.5°)]. Clinical healing time[(11.0±3.3)weeks]of the polymeric patella ring device group was shorter than that of the tension band group[(12.0±4.5)weeks], with statistically significant differences(P<0.001). The flexion activity of the affected side of the knee joint was normal in the two groups 24 weeks after the operation, while the loss of flexion activity in the polymeric patella ring device group(5.0°±3.3°)was better than that in the tension band group(12.0°±6.7°), and the difference was statistically significant(P<0.001). Conclusion In the treatment of patella fracture, the patients had less symptoms of stimulation of the surrounding soft tissues of the patella, more stable internal fixation, better early functional rehabilitation effect of the knee joint, relatively shorter clinical healing time, and better treatment effect. Key words: Patella; Fracture; Polymeric patella ring device; Tension band; Knee joint