Hallux rigidus: surgical treatment with the crescentic oblique basilar resection arthroplasty (COBRA).

The treatment of advanced hallux rigidus in an older, more sedentary population with poor bone stock or comorbidities that may make corrective osteotomy, fusion, and implant fixation more problematic has frequently been an issue for orthopedic surgeons. The traditional Keller resection arthroplasty has not fared well because of various problems. Crescentic oblique basilar resection arthroplasty is a viable surgical treatment alternative for older, more sedentary patients who have advanced hallux rigidus with or without hallux valgus. This may also be a good alternative procedure in a more active patient who wishes to avoid fusion of the joint while maintaining some first MTP motion.