Table 1 Demographic data of the patients (n = 71)

Mean age at operation (years) (range)

59.4 (24 to 78)

Gender (male/female)

24 / 47

Body mass index (kg/m²) (range)

23.5 (19.2 to 28.1)

Preoperative diagnosis (n, %)

 Osteoarthritis

31 (44)

 Femoral head osteonecrosis

27 (38)

 Femoral neck fracture

7 (10)

 Rheumatoid arthritis

3 (4)

 Others

3 (4)

ASA score (n, %)

 1

28 (39)

 2

39 (55)

 3

4 (6)

 4

0 (0)

Type of prosthesis (n, %)

 Trilogy cementless cup (Zimmer, Warsaw, IN)

71 (100)

 Fiber metal taper stem (Zimmer)

71 (100)