Ann R Coll Surg Engl 2011; 93: 57-60 57 Distal radius fractures are one of the most common fractures presenting to orthopaedic surgeons. Traditionally, such fractures have largely been treated by closed reduction and immobilisation in plaster, yet improvements in orthopaedic technology have changed the management of distal radius fractures. The use of volar plates for managing distal radius fracture is now almost universal to orthopaedic surgeons engaged in adult trauma care.The conventional means of internal fixation of dorsally displaced distal radius fractures was by dorsal plating to create a mechanically stable, dorsal buttress effect. The close proximity between plate and tendons, however, meant that extensor tendon irritation and rupture were common; hence, although it inferred improved fixation, it had unacceptable tendon complications.1-4 Improvements in plate design, in the form of locking plates, have allowed mechanical stability of the fracture to be achieved with plates on the volar surface of the radius, which has better tendon relationships. This mechanical advantage stability, even in osteoporotic bone, allows early active mobilisation and has resulted in a marked increase in the use of volar fixation of distal radius fractures. 5,6 Despite the improved tendon relationships, extensor tendon complications remain. Most commonly affected is the tendon of the extensor pollicis longus (EPL), owing to its confinement within the EPL groove. The cause of tendon irritation and rupture is thought to be due to attrition either by prominent screws or perforating the dorsal surface intraoperatively with a drill.
7-13We sought to investigate if it were possible to identify screw hole positions, within three of the most commonly used locking plates in the UK, through which a long screw may pose a risk of injury to the EPL tendon in the EPL groove. This knowledge combined with the understanding that the use of all screw holes is not always necessary to achieve fracture stability may reduce the risk of EPL tendon irritation and rupture.
Subjects and MethodsEighteen preserved cadaveric forearms were examined. Each arm was from a different individual and had been preserved by freezing and was completely thawed before use. Cadavers were examined both visually and radiographical- (EPL) tendon is a recognised complication following volar plate fixation of distal radius fractures, usually from attrition caused by prominent screws. We sought to identify the screw holes in some of the most commonly used plates which may precipitate tendon injury. SUBJECTS AND METHODS Three fixed-angle volar locking plates were sequentially positioned into 18 cadaveric arms. A wire was passed through each of the holes in the plates using a locking guide and the dorsal relationships noted. RESULTS Each plate had specific 'high-risk' holes which directed the wire towards the EPL groove. The central screw holes appeared mostly implicated in EPL injury. CONCLUSIONS Awareness of 'high-risk' holes and appropriate minor alterations in surgical ...