Hyperextension injury to the PIP joint or to the MP joint of the thumb–a clinical study.

Jespersen B, Nielsen NS, Bonnevie BE, Boeckstyns ME. Scand J Plast Reconstr Surg Hand Surg 1998 Sep;32(3):317-21.

We present a prospective study of the diagnosis and clinical course of 60 patients with 57 pure hyperextension injuries to the proximal interphalangeal (PIP) joint of the long fingers (fingers 2-5) and seven injuries to the metacarpophalangeal (MP) joint of the thumb. Thirty four of the injuries (57%) were related to ball sports, and the ulnar fingers of the non-dominant hand were usually affected. There were 24 avulsion fractures at the site of the insertion of the volar plate on to the middle phalanx. Twelve (20%) initially presented with hyperextension instability, and this was usually associated with an avulsion fracture. Thirty four of the patients (57%) had symptoms for less than one month, while 10 (17%) complained of symptoms six months after the injury. Severe complications such as daily pain and stiffness were encountered in three cases. The triad sign (pain on extreme flexion and extension) was of no use as a diagnostic or prognostic factor, nor did the radiographic stress-view help to identify acute instability of the joint.

Early active mobilisation of volar plate avulsion fractures.

Gaine WJ, Beardsmore J, Fahmy N. Injury 1998 Oct;29(8):589-91.

This is a prospective follow up of 190 consecutive cases of volar plate avulsion fractures. A standard management regimen of immediate, active movement was followed in all cases and physiotherapy was rarely required. Of the 190 patients, 162 were followed up for at least one year. An excellent or good outcome was achieved in 98 per cent. Patients presenting more than three weeks from injury had a worse outcome. The size and displacement of the avulsed fragment did not affect the outcome. For the stable joint, early active mobilisation with minimal or no splintage provides a good result.