Wood M B, Dobyns J H
J Hand Surg Am. 1981 Jan;6(1):73-6. doi: 10.1016/s0363-5023(81)80015-9.
Three cases of traumatic volar dislocation of the metacarpophalangeal (MP) joint of a finger had a common pathologic condition, interposition of the dorsal capsule within the joint space. Late treatment included open reduction. MP joints arthrodesis, or arthroplasty. We reproduced volar dislocation of the MP joint in cadaver specimens by a hyperflexion, proximal translational force applied to the dorsum of the proximal phalanx. In all dislocations, the dorsal capsule of the joint was avulsed proximally and drawn into the joint. Dorsal capsule entrapment may be an important pathologic feature militating against successful closed management in a significant percentage of these injuries. A dorsal surgical approach with reduction and repair is recommended when the injury is seen before onset of gross degenerative changes within the MP joint.
三例手指掌指（MP）关节创伤性掌侧脱位有一个共同的病理状况，即背侧关节囊嵌入关节间隙。晚期治疗包括切开复位、MP关节融合或关节成形术。我们通过向近节指骨背侧施加过度屈曲、近端平移力，在尸体标本上重现了MP关节的掌侧脱位。在所有脱位中，关节的背侧关节囊在近端被撕脱并被拉入关节。背侧关节囊嵌顿可能是一个重要的病理特征，在相当比例的这些损伤中不利于成功的闭合治疗。当在MP关节出现明显退行性改变之前发现损伤时，建议采用背侧手术入路进行复位和修复。
