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Table 2 Grade of 1st metatarsophalangeal joint degeneration as defined by Regnauld 1986

From: Hallux valgus and hallux rigidus: a comparison of impact on health-related quality of life in patients presenting to foot surgeons in Australia

Grade 1
Functional limitation of dorsiflexion, mild dorsal spurring, acute/subacute pain joint enlargement, slight joint space narrowing, no structural sesamoid disease
Grade 2
Limitation of motion (75%), broadening and flattening of the metatarsal head and base of proximal phalanx, joint space narrowing, structural first ray elevatus, osteochondral defect, metatarsalgia, sesamoid hypertrophy
Grade 3
Severe loss of joint space, ankylosis, extensive dorsal medial and lateral spurring, osteophytes may bridge the joint space, osteochondral defects of metatarsal head +/- proximal phalanx +/- joint mice, extensive sesamoid hypertrophy