Biomechanical study on different high-strength sutures and suture site for repairing posterior root tear of the medial meniscus / 中国骨伤

OBJECTIVE@#To compare biomechanical characteristic of different high-strength sutures and suture sites for repairing posterior root tear of the medial meniscus with modified Mason-Allen technique.@*METHODS@#Forty-eight specimen of medial meniscus of knee joint from fresh porcine (female, aged from 5 to 9 months with an average of 7 months) were chosen and established experimental model. The samples were divided into red zone fixation group and red-white zone fixation group according to suture sites, 24 in each group; and then were randomly divided into 3 subgroups which 8 in each group, and fixed with Ethibond suture, Ultrabraid suture and FiberWire suture, respectively. Biomechanical tests were performedon universal electromagnetic and mechanical testing machine. Each specimen was underwent 1 000 cyclic tests on the first time, then pull out test until failure. The maximum failure load, yield load, stiffness and displacement were analyzed.@*RESULTS@#All specimen were successfully completed biomechanical tests. The failure mode of Ethibond group was caused by suture fracture; 6 cases of Ultrabraid suture group was caused by suture fracture which belong to red zone fixation group, 10 cases were caused by suture pull out, which 2 cases belong to red zone fixation group, 8 cases belong to red-white zone fixation group;8 cases of FiberWire group was caused by suture pull-out. Biomechanical test showed that:(1)In terms of suture strength, comparison of the maximum failure load, yield load and stiffness showed that Ethibond suture group

Modified arthroscopic anterior approach for the treatment of shoulder Bankart lesion / 中国骨伤

OBJECTIVE@#To explore the effects of single anterior approach under shoulder arthroscopy in the treatment of Bankart injury, and to provide a scheme to overcome the difficulties and simplify the operation process.@*METHODS@#From July 2016 to January 2019, 62 patients with recurrent dislocation caused by Bankart leision were treated under shoulder arthroscopy, including 50 males and 12 females, ranging in age from 19 to 44 years old with an average age of (26.5±6.1) years old. There were 25 cases of left shoulder and 37 cases of right shoulder. The patients were divided into two groups according to the operation mode, 35 patients in the front modified single approach group (experimental group) and 27 patients in the traditional double approachgroup (control group). The results of the operation were evaluated by assessing the preoperative and postoperative ASES scores of the shoulder joint, and the time of the approach establishment and the overall operation process was recorded to evaluate whether the operation time of the experimental group was shortened.@*RESULTS@#Three patients were lost during the follow-up after operation, and except for one case of re-dislocation, all patients achieved satisfactory results without neurovascular injury and other complications. The patients were followed up before operation and 3, 6, 12 months after operation, and the ASES scores were significantly enhanced at the latest follow-up compared with those of before operation. The time of establishing surgical approach in the experimental group was (7.5±1.5) minutes, which was shorter than that of control group (13.7±1.2) minutes.@*CONCLUSION@#The improved technique of single-channel anterior approach has the advantages of reducing the surgical incision and shortening the operationtime while ensuring the quality of the operation, which is worthy of popularization and application.