Results of central ray metacarpal resection after failure of digit replantation in children.

Central ray amputation results severe esthetic blemish and functional and psychological sequelae. Three main reconstruction procedures have been reported in adults: digital translocation, intracarpal osteotomy, and metacarpal resection; none of these, however, have been studied in children. The aim of this study was to report medium-term results for treatment of central ray amputation by proximal metacarpal resection following failure of digit replantation in children (i.e., skeletally immature patients). All children consecutively operated on by metacarpal resection after failure of digit replantation for complete central ray amputation between 2012 and December 2017 were retrospectively included. The surgical procedure consisted in metacarpal resection through a palmar approach, with deep transverse metacarpal ligament reconstruction. At last follow-up, adjacent finger range of motion, pain, rotational deformity and grip strength were evaluated, as well as metacarpal laxity. Metacarpal migration index and metacarpal divergence were measured on standard X-ray. Eleven children with a mean age of 11 ± 8 years were included. At mean 18 ± 3 months' follow-up, range of motion in adjacent digits was conserved in all cases, with no intermetacarpal laxity. Grip strength was 28% lower than for the contralateral side. Two patients showed rotational malalignment in extension, without functional impairment. In 4th ray amputation (n = 8), metacarpal migration index was decreased by 65% due to radial migration of the 5th metacarpal, but metacarpal divergence was conserved in all cases. Isolated metacarpal resection of the central ray for replantation failure is a reliable and safe procedure with good radiological and functional results in skeletally immature children.

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