Clinical and Radiological Outcomes of Extracorporeal Shock Wave Therapy in Early-Stage Femoral Head Osteonecrosis

Table 1

Patient demographic characteristics.

Variable	Values
Patients/hips (no.)	21 (33)
Age (years)	37.5 ± 4.8 (21-54)
Male/female (no. of patients)	9/12
Right/left (no. of hips)	14/19
Bilateral disease (no. of patients)	12
Duration of symptoms (months)	6 ± 3 (3-9)
ARCO grade (no. of patients/hips)
Grade-I	4/5
Grade-II	17/28
Medical history (no. of patients/hips)
Sickle cell disease	11/18
Systemic lupus erythematosus	2/3
Steroid intake	3/3
History of trauma	3/5
Idiopathic	2/4
Length of follow-up (years)	5 ± 3.5 (2-9)

The values are given as the mean and standard deviation with the range in parentheses. ARCO: the Association Research Circulation Osseous.