Discussion Our longitudinal study of 125 skeletally immature girls with idiopathic scoliosis who each had a minimum of 5 consecutive hand radiographs made at 6 monthly intervals demonstrated that the ossification and fusion patterns of the distal and proximal phalangeal epiphyses of the thumb have a highly significant correlation with those of the ulnar 4 digits as staged with the TW3 system (>70% concordance rate).
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Validation Study of the Thumb Ossification Composite Index (TOCI) in Idiopathic Scoliosis: A Stage-to-Stage Correlation with Classic Tanner-Whitehouse and Sanders Simplified Skeletal Maturity Systems.
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