Hanson Chad D, Thompson Jay C, Checketts Jake X, Beason David P, Pille Craig, Lemak Lawrence
Oklahoma State University Medical Center, Department of Orthopaedic Surgery, Tulsa, Oklahoma.
American Sports Medicine Institute, Lemak Health, Birmingham, Alabama, U.S.A.
Arthrosc Sports Med Rehabil. 2021 Aug 27;3(5):e1513-e1516. doi: 10.1016/j.asmr.2021.06.015. eCollection 2021 Oct.
To investigate whether pullout strength in the acellular dermal allograft matrix (ADM) used for superior capsule reconstruction depends on the distance from the edge of the graft.
ADM used for superior capsule reconstruction was obtained and cut into 30 squares. Two sutures were placed through the center of each graft by using a loaded Keith needle and forming a simple stitch. The grafts were divided into 3 groups of 10 grafts with a distance of 5 mm, 10 mm or 15 mm from the closest edge of the graft, respectively. The grafts were then preloaded to 5 N and pulled to failure at a rate of 12 mm/s on an MTS 858 MiniBionix servohydraulic mechanical test frame. The load to failure was recorded as well as the stiffness of each graft.
The mean load to failure was 34.5 N (SD 7.89) for the 5 mm grafts, 31.7 N (SD 5.99) for the 10 mm grafts, and 66.2 N (SD 18.4) for the 15 mm grafts. There was a significant difference (< 0.0001) between the large grafts (15 mm) and the 2 smaller grafts (10 mm, 5 mm). There was no significant difference in stiffness between the groups of graft ( 0.40).
Placing the suture at least 15 mm from the edge of the graft increases the graft's ultimate yield strength to suture pullout.
The depths of the suture in ADM could improve pullout strength for constructs of superior capsular reconstructions.
研究用于上囊重建的脱细胞真皮同种异体基质（ADM）的拔出强度是否取决于距移植物边缘的距离。
获取用于上囊重建的ADM并切成30个正方形。使用带线的凯斯针穿过每个移植物的中心并形成简单缝线。将移植物分为3组，每组10个移植物，分别距移植物最近边缘5毫米、10毫米或15毫米。然后在MTS 858 MiniBionix伺服液压机械测试框架上对移植物预加载至5牛，并以12毫米/秒的速度拉至破坏。记录破坏载荷以及每个移植物的刚度。
5毫米移植物的平均破坏载荷为34.5牛（标准差7.89），10毫米移植物为31.7牛（标准差5.99），15毫米移植物为66.2牛（标准差18.4）。大移植物（15毫米）与两个较小移植物（10毫米、5毫米）之间存在显著差异（<0.0001）。移植物组之间的刚度无显著差异（P = 0.40）。
将缝线置于距移植物边缘至少15毫米处可提高移植物对缝线拔出的极限屈服强度。
ADM中缝线的深度可提高上囊重建结构的拔出强度。
