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Table 5 Volume and distribution of the femoral head necrosis area before 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

Percentage AFHN SIFHN IFHN All
ASM 48.6 ± 12.3 66.4 ± 12.2 53.6 ± 23.9 55.2 ± 18.6
PSM 48.9 ± 14.5 51.1 ± 22.9 38.2 ± 13.5 44.7 ± 16.4
ASL 33.4 ± 15.9 38.8 ± 17.1 37.8 ± 16.2 36.7 ± 15.4
PSL 26.2 ± 9.5 23.2 ± 10.8 27.9 ± 13.8 26.2 ± 11.3
AIM 9.9 ± 4.1 30.2 ± 11.3 13.1 ± 7.1 16.3 ± 10.9
PIM 14.4 ± 4.8 16.1 ± 4.0 14.9 ± 8.9 15.1 ± 6.4
AIL 9.4 ± 6.9 10.1 ± 4.6 11.3 ± 8.7 10.4 ± 6.9
PIL 7.7 ± 3.4 7.4 ± 2.6 7.9 ± 3.5 7.7 ± 3.1
Mean 24.8 ± 7.2 30.4 ± 5.4 25.6 ± 8.7 26.5 ± 7.5
  1. ASM anterior superior medial, PSM posterior superior medial, ASL anterior superior lateral, PSL posterior superior lateral, AIM anterior inferior medial, PIM posterior inferior medial, AIL anterior inferior lateral, PIL posterior inferior lateral, AFHN alcoholic femoral head necrosis, SIFHN steroid-induced femoral head necrosis, IFHN idiopathic femoral head necrosis