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Table 2 Baseline characteristics of the formed age- and sex-dependent ONFH-subgroups

From: Results of advanced core decompression in patients with osteonecrosis of the femoral head depending on age and sex—a prospective cohort study

Subgroup “Age”ONFH, mono-/bilateral (count)Sex, male/female (count)Age, years (mean ± SD)Treatment, ACD/mACD (count)Follow-up, months (mean ± SD)
< 30 years (N = 9)8/16/3n.a.5/433.41 ± 24.61
≥ 30/< 40 years (N = 16)11/510/6n.a.7/939.18 ± 26.26
40/< 50 years (N = 27)23/425/2n.a.15/1234.49 ± 24.11
≥ 50 years (N = 34)29/525/9n.a.19/1527.44 ± 24.90
Subgroup “Sex”     
Male (N = 66)52/14n.a.47.34 ± 11.7433/3329.67 ± 23.15
Female (N = 20)19/1n.a.45.16 ± 13.6513/741.68 ± 28.49
  1. SD standard deviation