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Proximal toe phalanx transplantation for bony stabilization and lengthening of partially aplastic digits.
In congenital malformations the lengthening of partially aplastic digits, by on-top plasty of a bone graft or the bony stabilization of finger stumps consisting of soft tissues without skeletal elements, is extremely difficult. The usual bone graft, taken from the iliac crest or the fibula, will undergo resorption and will have disappeared a few months postoperatively. Experience has shown that the proximal toe phalanx will with-stand any resorption if it is taken whole, covered by its periosteum. Another advantage is the possibility of the construction of a new joint between the metatarsophalangeal articular surface of the toe phalanx and the distal end of the recipient bone in the hand, which is usually covered by cartilage. Flexor and extensor tendons exist in most cases. Between 1976 and 1988, 69 transplantations of proximal toe phalanges were performed in 43 children. The indications were: boneless digital stumps or partial absence of digits in symbrachydactyly and ring constriction syndrome. Follow-up examinations of 40 patients with 63 transplanted phalanges at an interval of 36 months (12 to 160 months) has shown a 100% take of the bone graft provided it had not been split and the periosteum was undamaged. The earlier in life the operation was performed, the more postoperative growth was recorded. A joint construction was attempted in 46 digits with variable results; active mobility ranged from 0 degrees to 90 degrees. With the use of a tendon interposition, there is a less degree of shortening of the toes.
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