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. 2021 Jun 29;29(11):3525–3533. doi: 10.1007/s00167-021-06630-8

Table 2.

Modified classification of degenerative changes in the tibiotalar joint

Grade Classification
Takakura [2] van Dijk [12]
Grade 0 Undefined Normal joint or subchondral sclerosis (van Dijk grade 0)
Grade 1 No joint space narrowing but early sclerosis and osteophyte formation (Takakura grade 1) Osteophytes without joint space narrowing (van Dijk grade 1)
Grade 2 Narrowing of the joint space medially (Takakura grade 2) Joint space narrowing with or without osteophytes (van Dijk grade 2)
Grade 3 Obliteration of the joint space with subchondral bone contact medially (Takakura grade 3) and, obliteration of the whole joint space with complete bone contact (Takakura grade 4) (Sub)total disappearance or deformation of the joint space (van Dijk grade 3)