Percutaneous Distal Osteotomy of the Fifth Metatarsal for Correction of Bunio11ette

Magnan, Bruno; Samaila, Elena; Merlini, Michele; Bondi, Manuel; Mezzari, Silvio; Bartolozzi, Pietro
November 2011
Journal of Bone & Joint Surgery, American Volume;11/16/2011, Vol. 93-A Issue 22, p2116
Academic Journal
Background: Distal osteotomy of the fifth metatarsal is indicated in the surgical treatment of bunionette and varus deformities ofthe fifth toe in patients with a valgus deviation ofthe fifth metatarsal. The aim of this study was to evaluate the results of a subcapital percutaneous osteotomy of the fifth metatarsal in the treatment of this disorder. Methods: From 1996 to 2006, thirty consecutive percutaneous distal osteotomies of the fifth metatarsal were performed in twenty-one patients for the treatment of a painful prominence of the head of the fifth metatarsal. Combined procedures were performed, including a first metatarsal osteotomy in sixteen feet for hallux valgus treatment and a distal open osteotomy of the second metatarsal for painful dorsal dislocation of the second metatarsophalangeal joint in eight feet. The patients were assessed at a mean of ninety-six months with a radiograph ic and clin ical protocol that made use of the American Orthopaedic Foot & Ankle Society (AOFAS) Lesser Toe Metatarsophalangeal-Interphalangeal Scale. Results: The AOFAS score improved from a mean and standard deviation of 51.9 ± 10.2 points preoperatively to 98.4 ± 2.6 points at the t ime of final follow-up. In 73% of feet there was complete resolution of pain at the fifth metatarsophalangeal joint without any functional limitation (AOFAS score of 100). In 20% of the cases the AOFAS score was 95 points with some decrease in function and a need to use comfortable shoes. In the remaining 7% of patients the AOFAS score was 93 points with mildly asymptomatic malalignment. No nonunions or recurrences were observed. Conclusions: The percutaneous procedure described here is a rel iable technique to perform a distal t ransverse osteotomy of the fifth metatarsal to correct a painful varus fifth-toe deformity with prominence of the fifth metatarsal head. The cl inical results are comparable with those reported with traditional open techniques, with the advantages of a minimally invasive surgical procedure, substantially shorter operating time, and a reduced risk of complicat ions. Level of Evidence: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence


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