Lewis C W, Schlegel T F, Hawkins R J, James S P, Turner A S
Mechanical Engineering, Colorado State University, Fort Collins, Colorado 80523-1374, USA.
Biomed Sci Instrum. 1999;35:403-8.
There is little quantitative information available on the required healing time after a rotator cuff surgery. This study evaluated two surgical procedures by comparing the healing strength as a function of time of the tendon in a bone trough using a sheep model. The two surgical procedures compared were bioabsorbable suture anchors and bone tunnel suture technique. The infraspinatus tendon was split in half and procedure (suture anchor/tunnel suture) locations were randomly allocated to the proximal or distal half of the tendon at the healing time points of 0, 3, 6, 9, and 12 weeks with n = 6 at t = 0 and n = 8 in all other groups. At each time point, the surgical (right) and normal (left) shoulders were harvested and stored in a -30 degrees C freezer until testing. Biomechanical testing was performed using a MTS 809 Axial/Torsional Servohydraulic System. Special cryo-grips designed and built to test the infraspinatus tendon-bone interface in anatomical alignment were used. All samples were preloaded with 5 Newtons, and then force was measured during a crosshead displacement of 50 cm/min until failure. Force and displacement data were recorded to calculate load to failure and stiffness of the bone-tendon construct. There was only significant difference (95% CI) in mean tensile force at week 0, with the bone tunnel suture technique tensile force greater than the suture anchor method tensile force (p = 0.0261). There was no significant difference between stiffness means at any of the survival times.
关于肩袖手术后所需的愈合时间，几乎没有定量信息。本研究使用绵羊模型，通过比较骨槽中肌腱愈合强度随时间的变化，评估了两种手术方法。所比较的两种手术方法是生物可吸收缝线锚钉和骨隧道缝合技术。在0、3、6、9和12周的愈合时间点，将冈下肌腱一分为二，并将手术方法（缝线锚钉/隧道缝合）位置随机分配到肌腱的近端或远端一半，t = 0时n = 6，其他所有组n = 8。在每个时间点，采集手术侧（右侧）和正常侧（左侧）肩部，并储存在-30℃的冰箱中直至测试。使用MTS 809轴向/扭转伺服液压系统进行生物力学测试。使用专门设计和制造的低温夹具，以解剖学对齐方式测试冈下肌腱-骨界面。所有样本先预加载5牛顿，然后在以50厘米/分钟的十字头位移过程中测量力，直至失效。记录力和位移数据，以计算骨-肌腱结构的失效载荷和刚度。仅在第0周平均拉力存在显著差异（95%置信区间），骨隧道缝合技术的拉力大于缝线锚钉方法的拉力（p = 0.0261）。在任何存活时间的刚度平均值之间均无显著差异。
