The Role of Immune Regulatory Cells in Nontraumatic Osteonecrosis of the Femoral Head: A Retrospective Clinical Study

Table 1

The demographics of patients with ONFH.

Demographic	No./mean (SD)
Patients (M/F)	67
Unilateral	32
Bilateral	35
Hips	102
Male	52
Female	15
Mean age (year)	43.6 (12.9)
Mean BMI (kg/m^2)	24.1 (3.3)
Mean HHS (score)
Left	75.6 (16.6)
Right	75.0 (18.0)
Mean length of disease history (month)	25.0 (53.0)
Etiology
Idiopathic	29
Corticosteroids	16
Alcohol	22
ARCO stage, hips
Stage II	16
Stage III	56
Stage IV	30
CJFH classification, hips
L1	19
L2	14
L3	67
M	0
C	2