Die Rekonstruktion der Kahnbeinpseudarthrose mit avaskulärem proximalen Fragment mit freiem mikrovaskulär gestielten Beckenkammtransplantat

Abstract

The goal of the procedure is osseous healing of the scaphoid in an anatomic position and replacement of necrotic bone at the site of the scaphoid nonunion by a vascularized iliac bone graft. Scaphoid nonunion with necrotic fragment in SNAC (scaphoid nonunion advanced collapse) < 1. Nonunion following previous surgery. Pattern of advanced carpal collapse (SNAC > 1). Malformation, disease or previous injury of the vascular system. Poor compliance. Reduced general health. Principles of the surgical technique according to Pechlaner et al.: harvesting of a corticocancellous bone graft from the anterior iliac crest with a nutrient vascular bundle from the deep circumflex iliac artery, debridement of the necrotic scaphoid, press-fit fixation of the tailored graft, pin fixation, and microvascular anastomosis to the radial artery. Fixation in an upper-arm cast for 4 weeks, followed by lower-arm cast fixation including the thumb to the interphalangeal joint until week 12. Physiotherapy. Wrist splinting in patients enforced to heavy manual load. The described procedure has been practiced at the own institution since 1985 and evaluated in different studies. Using a free vascularized iliac bone graft, union could be achieved in 85% of patients with avascular scaphoid nonunion and in 80% with avascular proximal pole nonunion. The nonunion can be bridged in 93% following failed previous scaphoid screw fixation.