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Table 4 Contribution of pre- and postoperative pelvic mobility based on ∆ PT = PTstanding-PTsitting defined as stiff (∆ PT < 10°), normal (∆ PT ≥ 10°-–3°), and hypermobile (∆ PT > 30°) according to the BMI: group 1: ≥ 18.5–24.9 kg/m2, group 2: ≥ 25.0–29.9 kg/m2 and group 3: ≥ 30–39.9 kg/m2

From: Does obesity affect acetabular cup position, spinopelvic function and sagittal spinal alignment? A prospective investigation with standing and sitting assessment of primary hip arthroplasty patients

Pelvic mobility (∆ PT)

Normal ≥ 18.5–24.9 kg/m2

Overweight ≥ 25.0–29.9 kg/m2

Obese ≥ 30–39.9 kg/m2

Classification of pre-and postoperative pelvic mobility according to the BMI

Stiff (%/N)

 Pre

25.0 (17)

27.2 (22)

12.2 (5)

 Post

7.4 (5)

9.9 (8)

7.5 (3)

Normal (%/N)

 Pre

60.3 (41)

56.8 (46)

78.0 (32)

 Post

69.1 (47)

64.2 (52)

72.5 (29)

Hypermobile (%/N)

 Pre

14.7 (10)

16.0 (13)

9.8 (4)

 Post

23.5 (16)

25.9 (21)

20 (8)

  1. % represents the percentage contribution; N represents the absolute number of patients; pre = preoperative; post = postoperative