Abstract：
OBJECTIVE: To compare the biomechanical properties of adjunctive dorsal spanning plate (DSP) fixation with traditional K-wire fixation of perilunate dislocations in a cadaveric model.
METHODS: Fourteen fresh-frozen cadaveric wrists underwent simulated perilunate injury. The specimens were randomly allocated to either K-wire fixation versus K-wire and DSP fixation. Scapholunate (SL) ligament repair was performed in all specimens. The constructs were tested using a robot cyclically and to failure. Fluoroscopic images were obtained of the specimens prior to simulated injury, after fixation, after 10 and 100 loading cycles, and at construct failure. Differences in carpal alignment parameters (SL interval, SL angle, lunotriquetral interval, and capitolunate angle) and load to failure were recorded.
RESULTS: There were no statistically significant differences between the two group\'s carpal alignment parameters after fixation. Specimens fixated with K-wires and DSP required significantly higher loads to achieve construct failure. The only significant difference between the two groups\' carpal alignment parameters was SL interval change at failure.
CONCLUSIONS: Compared with K-wire fixation alone, adjunctive DSP fixation resulted in significantly increased loads to failure and decreased change in SL interval at the time of failure.
CONCLUSIONS: Adjunctive DSP may be a useful technique in the polytraumatized patient in whom providing back a weight-bearing extremity may be advantageous in the rehabilitation process.
METHODS: Fourteen fresh-frozen cadaveric wrists underwent simulated perilunate injury. The specimens were randomly allocated to either K-wire fixation versus K-wire and DSP fixation. Scapholunate (SL) ligament repair was performed in all specimens. The constructs were tested using a robot cyclically and to failure. Fluoroscopic images were obtained of the specimens prior to simulated injury, after fixation, after 10 and 100 loading cycles, and at construct failure. Differences in carpal alignment parameters (SL interval, SL angle, lunotriquetral interval, and capitolunate angle) and load to failure were recorded.
RESULTS: There were no statistically significant differences between the two group\'s carpal alignment parameters after fixation. Specimens fixated with K-wires and DSP required significantly higher loads to achieve construct failure. The only significant difference between the two groups\' carpal alignment parameters was SL interval change at failure.
CONCLUSIONS: Compared with K-wire fixation alone, adjunctive DSP fixation resulted in significantly increased loads to failure and decreased change in SL interval at the time of failure.
CONCLUSIONS: Adjunctive DSP may be a useful technique in the polytraumatized patient in whom providing back a weight-bearing extremity may be advantageous in the rehabilitation process.
摘要：
目的：在尸体模型中比较辅助背侧跨接钢板（DSP）固定与传统的K线固定治疗骨周脱位的生物力学特性。
方法：十四个新鲜冷冻的尸体手腕经历了模拟的periluate损伤。将标本随机分配给K线固定与K线和DSP固定。在所有标本中进行了肩胛骨韧带（SL）修复。使用机器人对构造进行了循环测试，直到失败。在模拟损伤之前获得标本的荧光图像，固定后，在10和100个加载周期之后，在构造失败时。腕骨对齐参数的差异(SL间隔，SL角度,肺间隔，和头状角度）和破坏载荷被记录。
结果：两组固定后的腕骨对齐参数无统计学差异。用K线和DSP固定的样本需要明显更高的负载才能实现构造故障。两组腕骨对齐参数之间唯一的显着差异是失败时的SL间隔变化。
结论：与单纯克氏针固定相比，辅助DSP固定导致故障负荷显着增加，故障时SL间隔的变化减少。
结论：辅助DSP可能是多发性创伤患者的一种有用技术，在该患者中，提供背部负重肢体可能在康复过程中具有优势。
方法：十四个新鲜冷冻的尸体手腕经历了模拟的periluate损伤。将标本随机分配给K线固定与K线和DSP固定。在所有标本中进行了肩胛骨韧带（SL）修复。使用机器人对构造进行了循环测试，直到失败。在模拟损伤之前获得标本的荧光图像，固定后，在10和100个加载周期之后，在构造失败时。腕骨对齐参数的差异(SL间隔，SL角度,肺间隔，和头状角度）和破坏载荷被记录。
结果：两组固定后的腕骨对齐参数无统计学差异。用K线和DSP固定的样本需要明显更高的负载才能实现构造故障。两组腕骨对齐参数之间唯一的显着差异是失败时的SL间隔变化。
结论：与单纯克氏针固定相比，辅助DSP固定导致故障负荷显着增加，故障时SL间隔的变化减少。
结论：辅助DSP可能是多发性创伤患者的一种有用技术，在该患者中，提供背部负重肢体可能在康复过程中具有优势。
