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Table 6 Correlation analysis between complications and Tonnis grade

From: Analyses of outcomes of one-stage operation for treatment of late-diagnosed developmental dislocation of the hip: 864 hips followed for 3.2 to 8.9 years

Tonnis Preoperative n(%) Redislocation Residual acetabular dysplasia
I 136(15.7) 0 4
II 259(30.0) 8 9
III 273(31.6) 5 10
IV 196(22.7) 1 3