Abstract：
OBJECTIVE: This study investigates the biomechanical effects of graft width and chondrolabral junction (CLJ) preservation on the labral suction seal in a bovine hip model and aims to validate this model as a practical alternative for hip biomechanical research by comparing it with human cadaver studies.
METHODS: Twenty hips from two-year-old male bovines were divided into two main groups: CLJ preserved (CLJ+) and CLJ excised (CLJ-). These groups were further divided into eight subgroups: Group 1 with an intact labrum; Group 2 with labrum excision preserving CLJ; Groups 3 and 4 with labral reconstruction on preserved CLJ using 4.5 mm and 9 mm grafts, respectively; Group 5 with a labral tear at 12 to 3 o\'clock position without CLJ preservation; Group 6 with complete labrum excision without CLJ preservation; and Groups 7 and 8 with labral reconstruction on excised CLJ using 4.5 mm and 9 mm grafts. Mechanical tests measuring compression and distraction forces were conducted, recording force-displacement values.
RESULTS: Both CLJ+ and CLJ- groups showed that labrum excision resulted in the lowest distraction forces, emphasizing labral integrity. Notably, reconstruction with 9 mm grafts improved distraction forces more than 4.5 mm grafts (p<0.001). The change in distraction forces from intact to excised stages was nearly significant between CLJ+ and CLJ- groups (Δ Intact-excised: CLJ+ vs. CLJ-: 92 N vs. 105 N, p=0.08). Distraction forces were measured at 206±27 Newtons in the CLJ preserved group and 186±24 Newtons in the resected group.
CONCLUSIONS: This study demonstrates that increasing the width of the graft, despite being approximately half and a quarter of the native labrum\'s size, significantly enhances the distraction force in labral reconstruction within a bovine hip model. This improvement is more pronounced than the effects of preserving the CLJ, highlighting the critical role of graft size in maintaining the biomechanical integrity of the labral suction seal.
METHODS: Twenty hips from two-year-old male bovines were divided into two main groups: CLJ preserved (CLJ+) and CLJ excised (CLJ-). These groups were further divided into eight subgroups: Group 1 with an intact labrum; Group 2 with labrum excision preserving CLJ; Groups 3 and 4 with labral reconstruction on preserved CLJ using 4.5 mm and 9 mm grafts, respectively; Group 5 with a labral tear at 12 to 3 o\'clock position without CLJ preservation; Group 6 with complete labrum excision without CLJ preservation; and Groups 7 and 8 with labral reconstruction on excised CLJ using 4.5 mm and 9 mm grafts. Mechanical tests measuring compression and distraction forces were conducted, recording force-displacement values.
RESULTS: Both CLJ+ and CLJ- groups showed that labrum excision resulted in the lowest distraction forces, emphasizing labral integrity. Notably, reconstruction with 9 mm grafts improved distraction forces more than 4.5 mm grafts (p<0.001). The change in distraction forces from intact to excised stages was nearly significant between CLJ+ and CLJ- groups (Δ Intact-excised: CLJ+ vs. CLJ-: 92 N vs. 105 N, p=0.08). Distraction forces were measured at 206±27 Newtons in the CLJ preserved group and 186±24 Newtons in the resected group.
CONCLUSIONS: This study demonstrates that increasing the width of the graft, despite being approximately half and a quarter of the native labrum\'s size, significantly enhances the distraction force in labral reconstruction within a bovine hip model. This improvement is more pronounced than the effects of preserving the CLJ, highlighting the critical role of graft size in maintaining the biomechanical integrity of the labral suction seal.
摘要：
目的：这项研究调查了牛髋关节模型中移植物宽度和软骨唇连接（CLJ）保留对唇吸引密封的生物力学影响，并旨在通过将其与人类尸体研究进行比较，验证该模型作为髋关节生物力学研究的实用替代方法。
方法：将两岁雄性牛的20髋分为两大类：CLJ保留（CLJ）和CLJ切除（CLJ-）。这些组进一步分为八个亚组：第1组，阴唇完整；第2组，阴唇切除保留CLJ；第3组和第4组，使用4.5mm和9mm移植物在保留的CLJ上进行阴唇重建，分别；第5组，在12到3点位置有唇撕裂，不保留CLJ；第6组，完全切除唇，不保留CLJ；第7组和第8组，使用4.5毫米和9毫米移植物对切除的CLJ进行唇重建。进行了测量压缩力和牵引力的机械测试，记录力位移值。
结果：CLJ+和CLJ-组显示唇切除导致最低的牵张力，强调实验室的完整性。值得注意的是,9毫米移植物的重建改善了超过4.5毫米移植物的牵引力（p<0.001）。在CLJ和CLJ-组之间，从完整到切除阶段的牵引力变化几乎是显着的（Δ完整切除：CLJvs.CLJ-：92Nvs.105N,p=0.08)。在CLJ保留组中测量到206±27牛顿的牵引力，在切除组中测量到186±24牛顿的牵引力。
结论：这项研究表明，增加移植物的宽度，尽管大约是原生唇的一半和四分之一的大小，在牛髋关节模型中的唇重建中显着增强了牵引力。这种改善比保存CLJ的效果更明显，强调移植物大小在保持唇吸引密封的生物力学完整性方面的关键作用。
方法：将两岁雄性牛的20髋分为两大类：CLJ保留（CLJ）和CLJ切除（CLJ-）。这些组进一步分为八个亚组：第1组，阴唇完整；第2组，阴唇切除保留CLJ；第3组和第4组，使用4.5mm和9mm移植物在保留的CLJ上进行阴唇重建，分别；第5组，在12到3点位置有唇撕裂，不保留CLJ；第6组，完全切除唇，不保留CLJ；第7组和第8组，使用4.5毫米和9毫米移植物对切除的CLJ进行唇重建。进行了测量压缩力和牵引力的机械测试，记录力位移值。
结果：CLJ+和CLJ-组显示唇切除导致最低的牵张力，强调实验室的完整性。值得注意的是,9毫米移植物的重建改善了超过4.5毫米移植物的牵引力（p<0.001）。在CLJ和CLJ-组之间，从完整到切除阶段的牵引力变化几乎是显着的（Δ完整切除：CLJvs.CLJ-：92Nvs.105N,p=0.08)。在CLJ保留组中测量到206±27牛顿的牵引力，在切除组中测量到186±24牛顿的牵引力。
结论：这项研究表明，增加移植物的宽度，尽管大约是原生唇的一半和四分之一的大小，在牛髋关节模型中的唇重建中显着增强了牵引力。这种改善比保存CLJ的效果更明显，强调移植物大小在保持唇吸引密封的生物力学完整性方面的关键作用。
