Introduction: Good outcome following traumatic injuries of the thumb ray depends upon obtaining and maintaining anatomical reduction. Traditional methods using percutaneous Kirschner wires often yield poor results in complex injuries. The Stockport Serpentine Spring System, or “S” Quattro, was developed to achieve and maintain fracture reduction by ligamentotaxis. Distraction reduces fracture fragments due to the tension of ligamentous and structures surrounding the injured joint.
Methods: Ten patients with thumb fractures were treated with the “S” Quattro external-fixation device over a seven-year period from 1996–2003. The operative technique as described by Fahmy was employed. The fixation device was applied for 3 to 7 weeks.
Results: Of the 10 patients, 8 were male and 2 female, and their mean age was 28.9 (range 18–46). Injuries were sustained through sports injuries (6), falls (2) and road traffic accidents (2). Half of the patients were referrals from other orthopaedic units, three of these having failed conservative management. Injuries included 2 Rolando fractures, 5 closed, comminuted metacarpal fractures, 1 open, comminuted fracture and 1 fracture subluxation of the carpometacarpophalangeal joint. Mean interval to treatment was 8.1 days (range 2–15 days). Patients were followed for an average of 8.3 months (range 3–25 months). The mean total range of motion at discharge for the affected joint was 130 degrees. Two patients described subsequent joint pain and stiffness, one developed complex regional pain syndrome. Of note, this patient had a synchronous fracture of the distal humerus. Overall, most patients expressed high outcome satisfaction with mean DASH (Disability of the Arm, Shoulder and Hand) scores of 31.4.
Conclusion: The “S” Quattro dynamic external –fixation device proved to be effective in the management of intra-articular fractures of the first ray. The fixator achieved good functional results with an acceptably low complication rate. We propose that this device is superior in maintaining anatomical reduction of these comminuted fractures than traditional methods such as Kirschner wiring.
