In patients with rheumatoid arthritis is very often to release the joint between the first metatarsal and os cuneiforme, thus becoming the first metatarsal unstable. There is a varus deviation I.
MTT, which worsens valgus deviation of the hallux. One of the possibilities of surgical treatment is arthrodesis of the joint between the I.
MTT and os cuneiforme - operation by Lapidus.