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Table 4 HHS 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 76.9 ± 4.9 86.9 ± 2.5** 93.2 ± 3.3**
 Phase II 66.5 ± 5.8 71.4 ± 5.4** 67.4 ± 15.3
Pathogeny
 AFHN 78.3 ± 5.3 87.8 ± 2.4** 94.0 ± 3.2**
 SIFHN 61.9 ± 5.3 66.9 ± 2.7* 55.0 ± 3.3*
 IFHN 71.1 ± 3.0 77.8 ± 5.9* 81.2 ± 12.9*
Total 71.1 ± 7.5 78.2 ± 9.1** 78.7 ± 17.4*
  1. AFHN alcoholic femoral head necrosis, SIFHN steroid-induced femoral head necrosis, IFHN idiopathic femoral head necrosis
  2. *P < 0.05; **P < 0.01