Table 1: Classification of the Hallux rigidus according to severity [14, 15].

GradeClinical findingsRadiological findings

IPain at end of passive ROM
Functional limitation without radiographic degradation of articular cartilage
Metatarsus primus elevatus, plantar subluxation of proximal phalanx
no radiographic evidence of DJD
IILimited passive ROMDorsal spurring, subchondral eburnation, sclerosis, periarticular lipping, flattening of firstmetatarsal head, possible development of osteochondral defects
IIIGrade II plus joint crepitation and pain with full ROM established joint destructionSubchondral bone cyst, severe flattening of joint, severe spurring, asymmetrical joint space loss, articular cartilage loss
IVGrade III plus less than 10° first MTPJ ROM, possible total ankylosisObliteration of joint space, intra-articular loose bodies