In case of deformities of the forefoot (Hallux-valgus, Hallux-varus), the basal osteotomy may be more indicated than the distal osteotomy as it allows to achieve a greater degree of correction. However, weight bearing forces on the head of the first metatarsal acting at a distance from the osteotomy site subject the construct to an important dorsiflexion stress. Fixation strength being the important consideration led to design the B-BOP® Lock plate, specifically dedicated to basal osteotomy of the first metatarsal, with the following characteristics: * plantar positioning to obtain the best stability and resistance while reducing the implant bulkiness; * anatomical shape adapted to the plantar curve of the first metatarsal. Taking advantages of the most appropriated anatomical site to implant the B-BOP® Lock plate directly on tension, it offers an innovative and unique basal osteotomy fixation solution. The B-BOP® Lock osteosynthesis plate benefits now of the Surfix locking screws technology. The purpose of this study is to collect and publish data from several centers, several users.
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Rate of device related complications.
Timeframe: 12 months
Iprovement of American Orthopaedic Foot and Ankle Society Hallux Metatarsophalangeal-lnterphalangeal Scale (AOFAS HMIS) score
Timeframe: 12 months