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Table 3 OHS-C scores before and after the operation

From: Study on the outcome of patients with aseptic femoral head necrosis treated with percutaneous multiple small-diameter drilling core decompression: a retrospective cohort study based on magnetic resonance imaging and equivalent sphere model analysis

  Preoperative 6 months after the operation End of follow-up
Stage
 Phase I 24.7 ± 1.9 41.9 ± 3.5** 45.6 ± 3.2**
 Phase II 22.4 ± 2.2 30.8 ± 6.6* 26.0 ± 12.5
Pathogeny
 AFHN 24.2 ± 1.9 43.4 ± 2.8** 47.2 ± 1.8**
 SIFHN 22.0 ± 2.6 27.3 ± 3.3* 17.0 ± 2.9**
 IFHN 23.7 ± 2.4 34.8 ± 6.4* 35.6 ± 11.1*
Total 23.4 ± 2.3 35.6 ± 7.8** 34.6 ± 13.7*
  1. AFHN alcoholic femoral head necrosis, SIFHN steroid-induced femoral head necrosis, IFHN idiopathic femoral head necrosis
  2. *P < 0.05; **P < 0.01