First Metatarsophalangeal Joint Replacement in a Patient With Monostotic Fibrous Dysplasia and Associated Metatarsophalangeal Arthritis

Fibrous dysplasia (FD) is a benign disorder characterized by the replacement of normal bone tissue with fibrous connective tissue, making the bone more susceptible to fractures and increasing the risk of developing degenerative arthritis in multiple joints. We present an unusual case of monostotic FD affecting the first metatarsal, accompanied by metatarsophalangeal (MTP) arthritis, which caused difficulties in walking, pain, and reduced quality of life. The patient underwent the first MTP joint replacement using the mobile bearing ROTOglide™ first MTP joint replacement system; the use of this specific implant for this indication appears to be a novel aspect in the existing literature. Following the operation, the patient returned to normal activities, experiencing improvements in pain, walking, and quality of life, thus demonstrating excellent outcomes.