The aim of this study was to assess the biomechanical stability of different refixation systems for arthroscopic shoulder stabilization in a clinical relevant experiment. The anterior capsule-labrum-complex of 29 fresh frozen human shoulders was dissected from its attachment to the glenoid from the 1´00 to the 6´00 position and reattached with 3 suture anchors. We tested the 2,4 mm Fastak with Ethibond No. 2 and No. 3, the 2,8 mm Fastak with Ethibond No. 2, the 8 mm Suretac II and the Mitek Panalok with Ethibond No. 2 in two different experimental groups. In the first group, we used the Mitek Panalok according to the manufacturers instructions, in the second, we used a slightly modified technique. After the reconstruction of the joint capsule, we simulated an anterior luxation of the humeral head in 60° glenohumeral abduction and 90° external rotation. The load, at which the reattachment of the capsule to the glenoid failed, was measured and the failure mode was noted. The different experimental groups were compared to each other and to a control group, in which 5 intact shoulder specimens were luxated. The bone density of the glenoids was measured by pq-CT. In the control group, the avulsion of the joint capsule from its attachment to the humerus or glenoid was observed at an average load of 958,2 N. The reconstruction of the capsule with the 2,4 mm Fastak and Ethibond No. 2 failed at an average load of 342 N, the reattachment with the same suture anchor and Ethiond No. 3 at 692,2 N. In most cases, the reconstruction failed by rupture of the suture at the eyelet of the suture anchor. The reconstruction of the capsule with the 2,8 mm Fastak with Ethibond No. 2 failed at an average load of 722,8 N, mostly by suture rupture at the knot. In the first experimental group with Mitek Panalok, the reattachment failed at an average load of 424 N, most often by suture anchor pull-out. In the second experimental group, the reconstruction failed at an average load of 983,8 N, mostly by suture rupture. The reattachment of the capsule-labrum-complex with Suretacs failed at an average load of 468,8 N. The most often recorded failure mode was an additional capsule rupture. The differences in the stability of the reattachment of the anterior capsule with the different suture anchors are partially significant, but all anchors seem to be able to provide enough stability postoperatively to allow healing.
«
The aim of this study was to assess the biomechanical stability of different refixation systems for arthroscopic shoulder stabilization in a clinical relevant experiment. The anterior capsule-labrum-complex of 29 fresh frozen human shoulders was dissected from its attachment to the glenoid from the 1´00 to the 6´00 position and reattached with 3 suture anchors. We tested the 2,4 mm Fastak with Ethibond No. 2 and No. 3, the 2,8 mm Fastak with Ethibond No. 2, the 8 mm Suretac II and the Mitek Pana...
»