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. 2017 Jan 6;12:2. doi: 10.1186/s13018-016-0504-9

Table 4.

Correlation between Tönnis classification and OA progression

Tönnis classification OA progression (8 hips)
Grade 0 3/15 (20%)
1 4/7 (57.1%)
2 1/1 (100%)