Abstract
Objective: The aim of this study is to investigate neurologic complications of closed wedge valgization osteotomy technique using electrophysiological methods. Methods: Eleven extremities of 11 patients (mean age 52.75±5.39) with medial gonarthrosis and varus deformity were included. All patients underwent closed wedge valgization osteotomy in order to correct varus deformity. Results: The post-operative amplitude of nervus peroneus superficialis significantly decreased when compared to pre-operative amplitude. The mean pre-operative N. peroneus superficialis amplitude was 12.77, whereas it reduced to 5.44 postoperatively (p<0.05). Other nerve conduction velocity investigations showed no significant differences between preand post-operative values. A Needle Electromyography (EMG) study demonstrated neurogenic involvement in 4 patients after surgery. All of these 4 patients had denervation in the m.extensor hallucis longus needle EMG study. In 2 patients, the musculus tibialis anterior needle EMG study showed neurogenic involvement. One of these had denervation. One patient showed denervation in the m.extensor digitorum brevis needle EMG study. Conclusion: Although fibula osteotomy used in the closed wedge osteotomy technique was applied from the safe zone, electrophysiological investigations suggested that this zone may, in fact, not be safe. (JAREM 2014; 1: 12-7)
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