Table 1 Demographic, surgical, and CT data in the revision THA cohort

Demographic data

 Age (years)

70.2 (9.6)

 Female ratio (%)

73

 Body mass index (kg/m²)

23.4 (4.8)

 Diagnosis (hips)

Aseptic: 32, septic: 23

 Preoperative femoral rotation

11.3 (19.1)

Surgical data

 Surgical procedure (hips)

1-stage: 33; 2-stage: 22

 Leg length extension (mm)

11.9 (18.3)

 Change of femoral offset (mm)

 − 0.1 (9.5)

 Postoperative anatomical stem anteversion

24.7 (14.7)

Preoperative muscle sizes (mm²)

 Psoas muscle

500 (31.8)

 Iliac muscle

555 (39)

 Gluteus maximus

1926 (660)

 Gluteus medius

1688 (849)

Preoperative CT density of muscles

 Psoas muscle (HU)

35.2 (3.3)

 Iliac muscle (HU)

55.3 (46.0)

 Gluteus maximus (HU)

4.2 (2.9)

 Gluteus medius (HU)

12.1 (35.3)