To compare the anatomical and biomechanical properties of the subregions to the scapholunate interosseous ligament (SLIL) and two intracarpal ligaments.Methods Eight scaphoid-lunate,trapezoid-2nd metacarpal,capitate-3...To compare the anatomical and biomechanical properties of the subregions to the scapholunate interosseous ligament (SLIL) and two intracarpal ligaments.Methods Eight scaphoid-lunate,trapezoid-2nd metacarpal,capitate-3rd metacarpal ligaments were harvested as bone-ligament-bone grafts from fresh frozen adult cadavers.According to different subregion,the scaphoid-lunate ligaments were split to three parts by a thin osteotome.Using a vernier caliper,their anatomical parameters were measured.Bone blocks were then embedded in commercially available dental base acrylic resin powder;the embedded specimens were mounted on MTS 858 testing machine using a 10000 N load cell for all tensile tests.During the testing,the specimens were kept moist with saline to avoid desiccation.The ligaments were tested at a displacement rate of 10 mm/min until failure.Results Among the 3 subregions of SLIL,the dorsal and palmar parts had an almost equivalent load to failure [(170.2±35.1)N and (193.1±42.3)N] and stiffness [(80.7±13.8)N/mm and (72.3±22.8)N/mm],and the proximal part had the minimum load to failure [(51.1±16.1)N] and stiffness [(21.6±11.0)N/mm].The load to failure of trapezoid-2nd metacarpal and that of capitate-3rd metacarpal ligaments were (228.9±52.8)N and (277.6±66.2)N respectively;their stiffness were (100.2±48.2)N/mm and (143.6±44.1)N/mm,which indicated that they had stronger mechanical property than the dorsal SLIL.According to anatomic measurement data,the trapezoid-2 metacarpal and capitate-3rd metacarpal ligaments could match the size of dorsal SLIL by adequate modification;however,the capitate-3rd methacarpal joint had more similar profile to the scaphoid-lunate joint.Conclusion The dorsal and palmar parts possess an almost equivalent load to failure and stiffness;while the proximal part had the weakest biomechanical characteristics.Because of the identical anatomical and biomechanical properties,the bone-ligament-bone structure of the trapezoid-2nd metacarpal and capitate-3rd metascarpal ligaments can be used as an appropriate donor for the dorsal part of SLIL after it’s rupture,but the later presents more superiority in morphology.15 refs,2 figs.展开更多
文摘To compare the anatomical and biomechanical properties of the subregions to the scapholunate interosseous ligament (SLIL) and two intracarpal ligaments.Methods Eight scaphoid-lunate,trapezoid-2nd metacarpal,capitate-3rd metacarpal ligaments were harvested as bone-ligament-bone grafts from fresh frozen adult cadavers.According to different subregion,the scaphoid-lunate ligaments were split to three parts by a thin osteotome.Using a vernier caliper,their anatomical parameters were measured.Bone blocks were then embedded in commercially available dental base acrylic resin powder;the embedded specimens were mounted on MTS 858 testing machine using a 10000 N load cell for all tensile tests.During the testing,the specimens were kept moist with saline to avoid desiccation.The ligaments were tested at a displacement rate of 10 mm/min until failure.Results Among the 3 subregions of SLIL,the dorsal and palmar parts had an almost equivalent load to failure [(170.2±35.1)N and (193.1±42.3)N] and stiffness [(80.7±13.8)N/mm and (72.3±22.8)N/mm],and the proximal part had the minimum load to failure [(51.1±16.1)N] and stiffness [(21.6±11.0)N/mm].The load to failure of trapezoid-2nd metacarpal and that of capitate-3rd metacarpal ligaments were (228.9±52.8)N and (277.6±66.2)N respectively;their stiffness were (100.2±48.2)N/mm and (143.6±44.1)N/mm,which indicated that they had stronger mechanical property than the dorsal SLIL.According to anatomic measurement data,the trapezoid-2 metacarpal and capitate-3rd metacarpal ligaments could match the size of dorsal SLIL by adequate modification;however,the capitate-3rd methacarpal joint had more similar profile to the scaphoid-lunate joint.Conclusion The dorsal and palmar parts possess an almost equivalent load to failure and stiffness;while the proximal part had the weakest biomechanical characteristics.Because of the identical anatomical and biomechanical properties,the bone-ligament-bone structure of the trapezoid-2nd metacarpal and capitate-3rd metascarpal ligaments can be used as an appropriate donor for the dorsal part of SLIL after it’s rupture,but the later presents more superiority in morphology.15 refs,2 figs.
