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Table 1 Demographics and preoperative characteristics of 126 patients (185 hips)

From: Long-term outcomes of arthroscopic synovectomy and core decompression through multiple small bone holes for early-stage avascular necrosis of the femoral head

Age, mean (range; year)

38 (17–58)

Male: female (n)

95: 31

Right: left (n)

92: 93

Unilateral: bilateral involvement

89: 43

Education level, n (%)

 Low

55 (44)

 High

71 (56)

Etiologic factors, n (hip)

 Alcohol abuse

53 (85)

 Steroid use

48 (70)

 Unknown causes

25 (30)

Body mass index

26 ± 6.2

  < 25, n (%)

43 (34)

 25–30, n (%)

65 (52)

  > 30, n (%)

18 (14)

ARCO classification, hip (%)

 Stage I

43 (23)

 Stage II

114 (62)

 Stage III

28 (15)

Modified Harris Hip Score

65 ± 10.1

Visual analogue scale (mm)

9.1 ± 0.5

  1. Data are shown as mean ± standard deviation