Smith Jared M, Werner Frederick W, Harley Brian J
Department of Orthopedic Surgery, SUNY Upstate Medical University, Syracuse, NY.
Department of Orthopedic Surgery, SUNY Upstate Medical University, Syracuse, NY.
J Hand Surg Am. 2018 Sep;43(9):806-811. doi: 10.1016/j.jhsa.2018.05.020. Epub 2018 Jun 23.
To determine the 6 degrees of freedom forces and moments in the distal radius that occur during a pushup or other active wrist motions.
Eight fresh-frozen cadaveric wrists were moved through 6 physiological motions and held at 1 static pushup position while the force through the distal radius was measured with a 6 degrees of freedom load cell. Three levels of compressive force were applied at the pushup position.
Active wrist motions caused axial forces up to 283 N and moments up to 0.7 N-m. Those motions with a smaller range had significantly smaller axial forces than the larger flexion-extension or dart-thrower's motions. With an 89-N pushup force applied, the average maximum axial force was 69 N, the radially directed force was 12 N, and the moment about the radioulnar axis was 2.3 N-m. Linear extrapolation of the forces to 100% body weight indicate that the axial force going through the distal radius would be 663 N, the radial force would be 147 N, and the moment about the radioulnar axis would be 18.6 N-m.
Large distal radius forces and moments can occur during pushup and active wrist motions. There are not only large axial compressive forces but also nontrivial radially directed forces.
This study may help surgeons and therapists better treat complicated distal radius fractures as well as provide for better comparisons of existing or new distal radius plates and constructs that are designed to treat these complicated loading patterns.
确定在做俯卧撑或其他主动腕部运动时桡骨远端所承受的六个自由度的力和力矩。
八个新鲜冷冻的尸体手腕进行六种生理运动，并保持在一个静态俯卧撑位置，同时用一个六个自由度的测力传感器测量通过桡骨远端的力。在俯卧撑位置施加三个水平的压缩力。
主动腕部运动产生的轴向力高达283 N，力矩高达0.7 N·m。那些范围较小的运动产生的轴向力明显小于较大的屈伸或类似掷镖运动员动作产生的轴向力。施加89 N的俯卧撑力时，平均最大轴向力为69 N，径向力为12 N，绕桡尺轴的力矩为2.3 N·m。将力线性外推至100%体重表明，通过桡骨远端的轴向力将为663 N，径向力将为147 N，绕桡尺轴的力矩将为18.6 N·m。
在做俯卧撑和主动腕部运动时，桡骨远端会出现较大的力和力矩。不仅有较大的轴向压缩力，还有不可忽视的径向力。
本研究可能有助于外科医生和治疗师更好地治疗复杂的桡骨远端骨折，并能更好地比较现有的或新的桡骨远端钢板及结构，这些钢板及结构旨在治疗这些复杂的载荷模式。
