Hypermobility of the first metatarsal bone in patients with rheumatoid arthritis treated by Lapidus procedure

Abstract

Foot deformities are very common in patients with rheumatoid arthritis. Rheumatoid inflammation causes overall weakness of connective tissue and typical deformity of the foot.

The laxity of the first cuneometatarsal (CM) joint and imbalance of muscles around the first ray contributes to the emergence of the hallux valgus. The impaired CM joint causes the first metatarsal bone (MTT) to become unstable in the frontal and sagittal planes.

The severe hypermobility of the first MTT bone can lead to luxation of the metatarsophalangeal joint (MTP) of the great toe

Keywords

• Lapidus procedure
• Instability of the cuneometatarsal joint
• Hypermobility of the first metatarsal bone
• Rheumatoid arthritis
• Hallux valgus