Muellner T, Fuchs M, Kwasny O
University Clinic of Traumatology, University of Vienna.
Arch Orthop Trauma Surg. 1998;118(1-2):53-6. doi: 10.1007/s004020050311.
The stability of isolated ulnar shaft fractures required further investigation because no data were available for fractures in the middle third or on the effect on rotational stability. Ten intact cadaveric arms were used to study the pathomechanics of fractures of the middle ulna. In all of them a transverse osteotomy was performed (A), then in five of them, an additional osteotomy was done in order to create a third fragment (B). The interosseous membrane was subsequently divided for 2 cm on either side of the osteotomy (A-->C, C-->D). On radiographs the displacement was recorded in pronation and supination, and the rotational displacement was calculated. Rotational instability occurred in all fractures studied, even in the so-called stable ones. Also, dissection of the interosseous membrane was not followed by a displacement of more than 50%, and shortening of the ulna should also be considered in fractures with less than 50% displacement as a sign of instability.
孤立尺骨干骨折的稳定性需要进一步研究，因为尚无关于尺骨中1/3骨折或其对旋转稳定性影响的数据。使用10只完整的尸体手臂来研究尺骨中部骨折的病理力学。对所有手臂均进行了横向截骨（A），然后在其中5只手臂上进行了额外截骨以形成第三块骨块（B）。随后在截骨两侧将骨间膜切开2厘米（A→C，C→D）。在X线片上记录旋前和旋后时的移位情况，并计算旋转移位。在所研究的所有骨折中均出现了旋转不稳定，即使是所谓的稳定骨折。此外，切开骨间膜后移位未超过50%，对于移位小于50%的骨折，尺骨缩短也应被视为不稳定的征象。
