Abstract: Objective:To preliminarily investigate the difference of knee joint function recovery of perforated metal bone needle combined with titanium cable and internal fixation of patella ring in patients suffering from the comminuted patella fracture.
Methods:We enrolled 52 comminuted patellar fracture patients from January 2016 to January 2018 who underwent needle cable or patellar ring,26 patients were in needle cable group and 26 patients were in patellar ring group.The differences between the two groups in the recovery of knee function after internal fixation were compared. The patients in the two groups were followed up for 3 months to compare the complications of postoperative knee stiffness, contracture, disuse of flexion and extension function and loosening of internal fixation devices.
Results:We found that there were significant differences among the score of straight legraising training,limb muscle strength,rate of knee flexion and walking ability after a week,the recovery rate of knee joint efficacy after a month,complications such as knee stiffness,contracture,deactivation of flexion and extension function and loosening of internal fixation device in 3 months.Compared with the patellar ring group,the score of straight legraising training,limb muscle strength,rate of knee flexion and walking ability after a week of needle cable group was higher(P＜0.05),the recovery rate of knee joint efficacy after a month was better(P＜0.05),and complications such as knee stiffness,contracture,deactivation of flexion and extension function and loosening of internal fixation device in 3 months were less(P＜0.05).Conclusion:For patellar comminuted fracture,the treatment of perforated metal bone needle combined with titanium cable has strong internal fixation to the fracture ends,at the same time,it can provide help to the perioperative patients with postoperative knee early functional exercise.As for perioperative postoperative knee joint stiffness,contracture,expand function disuse loose loss and internal fixation devices such as the occurrence of complications,it has also obtained the satisfactory curative effect in clinical.

Key words: comminuted fracture of patella, metal bone needle with hole；titanium cable；patellar ring