SPONTANEOUS FUSION IN SCOLIOSIS AFTER INSTRUMENTATION WITHOUT ARTHRODESIS

The technique of subcutaneous rod insertion without exposure of the cu rve has been proposed as a method of controlling the progression of sc oliosis while allowing the spine to grow. We review the literature and present three patients whose spines spontaneously fused unexpectedly while undergoing this form of treatment. The fusion occurred posterior ly, and continued anterior growth led to increased deformity from the crankshaft phenomenon. Based on this experience, the authors recommend careful follow-up and early anterior fusion when the crankshaft pheno menon is observed.