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Official Journal of the Italian Society of Orthopaedics and Traumatology

Table 3 Sanders’ criteria for subtalar joint reduction and Allmacher’s criteria for subtalar joint osteoarthrosis

From: Surgical treatment of displaced intra-articular calcaneal fractures: is bone grafting necessary?

Criteria for roentgenographic subtalar joint reduction [24]

Arthrosis rating scale

Anatomic, no articular incongruity whatsoever

0 Normal

Near-anatomic, <3 mm of articular incongruity or gapping between fragments

I Osteophyte only

II Osteophyte with subchondral cysts and normal joint space

Approximate, 3–5 mm of articular incongruity or gapping between fragments

III Grade II + mild narrowing of the joint space

Failure, >5 mm of articular incongruity or gapping between fragments

IV Severe joint-space narrowing

V Fused