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

Table 6 Volume and distribution of the femoral head necrosis area at 6th month after the operation

Percentage	AFHN	SIFHN	IFHN	All	△V = (V_pre − V_post)
ASM	27.9 ± 10.4	72.8 ± 15.9	34.1 ± 16.7	41.8 ± 23.3	13.4 ± 17.4
PSM	28.6 ± 13.2	56.1 ± 26.7	24.3 ± 9.6	33.6 ± 20.2	11.2 ± 13.4
ASL	19.9 ± 11.7	41.3 ± 14.6	26.3 ± 18.6	28.1 ± 16.9	8.6 ± 10.5
PSL	15.3 ± 7.8	25.4 ± 12.9	16.7 ± 6.7	18.4 ± 8.9	7.8 ± 9.4
AIM	5.4 ± 2.5	32.6 ± 10.8	8.6 ± 6.2	13.6 ± 13.5	2.7 ± 4.9
PIM	8.4 ± 4.2	17.5 ± 3.5	8.5 ± 4.4	10.7 ± 5.6	4.3 ± 5.1
AIL	5.8 ± 4.9	11.3 ± 5.9	7.7 ± 6.6	8.0 ± 5.9	2.4 ± 3.8
PIL	4.5 ± 2.7	8.0 ± 2.5	5.3 ± 3.2	5.8 ± 3.0	1.9 ± 2.5
Mean	14.5 ± 6.6	33.1 ± 5.1	16.3 ± 7.5	19.9 ± 10.1	6.5 ± 7.9
△V = (V_pre − V_post)	10.3 ± 0.9	− (2.7 ± 2.6)	9.2 ± 8.7	6.5 ± 7.9	−

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

ISSN: 1749-799X