COMPARISON OF STABILITY OF PROXIMAL CRESCENTIC METATARSAL OSTEOTOMY AND PROXIMAL HORIZONTAL-V OSTEOTOMY

Proximal metatarsal osteotomies are often performed in patients with h allux valgus and significant metatarsus primus varus. The crescentic o steotomy is popular; however, some authors have reported malunion of t he metatarsal shaft caused by dorsal angulation of the osteotomy in a significant number of cases. Recently, proximal transverse ''V'' osteo tomies have been reported to have good results, with rapid healing and no dorsal malunions. We compared the stability of a transverse, proxi mal ''V'' osteotomy, using two 0.062-inch K-wires or a 3.5-mm cortical screw for fixation, with that of the proximal crescentic osteotomy, u sing a 3.5-mm cortical screw fixation. The three osteotomy/fixation te chniques were performed on 30 fresh-frozen cadaver feet. The specimens were loaded to failure at the fixation site by applying a load throug h the plantar surface of the first metatarsal head. Force versus displ acement curves were obtained to calculate the failure load and stiffne ss. Statistical differences among the three groups were determined by the nonparametric Mann-Whitney U-test and the standard t-test. The ''V '' osteotomy/screw group was more stable than either the ''V'' osteoto my/pin group or the crescentic osteotomy/screw group. Differences in f ailure strength between the ''V''/screw group and the other two groups were significant at the P < .01 level and the differences in stiffnes s were significant at the P = .05 level. No statistical differences we re found between the ''V''/pins and the crescentic/screw groups.