Abstract
Introduction
Biomechanical studies have shown that a long, centrally placed screw is favourable in scaphoid fracture fixation. A volar percutaneous transtrapezial approach was developed to facilitate central screw placement. The purpose of this study was to evaluate radiographic changes at the ST-joint at long term follow up in patients where this approach was used.
Method
Results were graded with use of the visual analogue scale (VAS) and modified Mayo wrist score. Radiographs of both hands, comprising an anteroposterior, lateral and 45 degrees pronated oblique view were obtained. Degenerative changes at the ST-joint were staged according to the modified Eaton & Glickel classification.
Results
34 patients with an average age of 34 years were followed at a mean of 6.1 years (4–9). Union was obtained in all at an average time of 6.4 weeks (6–10). There were no significant differences in VAS score and ROM, between the operated and nonoperated side (p>0.05). The mean Mayo wrist score was 93 (80–100). Three patients showed stage 2 osteoarthritis of the ST-joint. In 2 patients, stage 2 osteoarthritis was found in both the injured and uninjured side. One patient had asymptomatic stage 2 osteoarthritic changes at the injured side.
Discussion
The advantages of the volar percutaneous transtrapezial approach include central screw placement, without the need for manipulation of the wrist. From the present study it can be concluded that the volar percutaneous transtrapezial approach to fix scaphoid fractures does not lead to significant radiographic degenerative changes in the ST joint at a follow-up of more than 6 years.
