Jensen S L, Olsen B S, Søjbjerg J O
Orthopaedic Research Laboratory, University Hospital of Aarhus, Denmark.
J Shoulder Elbow Surg. 1999 May-Jun;8(3):238-41. doi: 10.1016/s1058-2746(99)90135-0.
The contribution of the radial head to elbow joint kinematics was studied in 7 osteoligamentous elbow preparations. During unloaded flexion and extension, radial head excision induced a maximum varus displacement of 1.6 degrees with 20 degrees of joint flexion and a maximum external rotation of 3.2 degrees at 110 degrees of flexion. With application of a 0.75-Nm load, radial head excision induced a maximum laxity of 3.3 degrees at 20 degrees of flexion in forced varus and a maximum laxity of 8.9 degrees at 10 degrees of flexion in forced external rotation. No laxity was observed in forced valgus or internal rotation. The results were independent of the rotation of the forearm. This study indicates that the radial head acts as stabilizer to the elbow joint in forced varus and in forced external rotation. The results suggest that fractures of the radial head cannot be treated by simple excision without altering the basic kinematics of the elbow joint.
在7个骨韧带肘关节标本中研究了桡骨头对肘关节运动学的贡献。在无负荷屈伸过程中，切除桡骨头在关节屈曲20°时导致最大内翻位移1.6°，在屈曲110°时导致最大外旋3.2°。施加0.75 N·m负荷时，切除桡骨头在强迫内翻20°屈曲时导致最大松弛度3.3°，在强迫外旋10°屈曲时导致最大松弛度8.9°。在强迫外翻或内旋时未观察到松弛。结果与前臂旋转无关。本研究表明，桡骨头在强迫内翻和强迫外旋时对肘关节起稳定作用。结果提示，桡骨头骨折不能简单地通过切除来治疗而不改变肘关节的基本运动学。
