From: Extracorporeal shock wave therapy for bone marrow edema syndrome in patients with osteonecrosis of the femoral head: a retrospective cohort study
Variable
ESWT group
Age, years
48.6 ± 11.2 (range, 25–73)
Male/female, n
24/43
ARCO stage, n
 I
10
 II
33
 III
24
Etiology, n
 Hormonal agent
25
 Alcohol
11
 Trauma
23
 Idiopathic
8
Duration of follow-up, months
3