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Table 1 General information of the subjects included in the study

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

General information Number
Gender
 Male 18 (24 hips)
 Female 6 (8 hips)
Average age (years) 47.1 ± 10.3 (20–62)
Pathogeny
 AFHN 8 (10 hips)
 SIFHN 6 (8 hips)
 IFHN 10 (14 hips)
Stage
 Ia 4
 Ib 6
 Ic 4
 IIa 4
 IIb 4
 IIc 10
Follow-up time (months) 25.9 ± 15.0 (9.0–55.0)
  1. AFHN alcoholic femoral head necrosis, SIFHN steroid-induced femoral head necrosis, IFHN idiopathic femoral head necrosis