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Table 1 Patient demographics

From: Total hip arthroplasty to treat acetabular protrusions secondary to rheumatoid arthritis

Demographics Data
Gender 6 males (6 hips), 12 females (14 hips)
Mean age 45.8 ± 8.3 years (range 37.0 to 68.5)
Course of disease 8~17 years (mean 9.2 ± 1.3 years)
Acetabular type Type I protrusion (1~5 mm), 0 case; type II protrusion (6~15 mm), 15 cases (17 hips); type III protrusion (> 15 mm), 3 cases (3 hips)
Outreach angle Extension angle < 25°, 12 cases (14 hips); mild extension limitation (extension angle > 25°), 6 cases (6 hips)
Abductor muscle strength classification Grade IV, 9 cases (11 hips); grade III, 9 cases (9 hips)
Operation time 55~131 min, 89.5 ± 8.1 min
Blood loss 165~480 mL, 295 ± 10.9 mL
Preoperative Harris score 55.3 ± 9.5 (40~65)
Postoperative Harris score 92.2 ± 12.7(89~95)
Preoperative hip flexion and extension activity 41.5° ± 6.7°
Hip flexion and extension at the last follow-up 102.3° ± 14.5°
Distance between the preoperative femoral head center and the ischial tubercle connection 77.55 ± 12.3 mm
Distance from the femoral head to the ischial tubercle at final follow-up 72.83 ± 11.1 mm
Distance from the femoral head center to the Kohler line 19.87 ± 3.9 mm
Distance from the femoral head center to the Kohler line 21.5 ± 3.5 mm
Follow-up time 2.5~6, 4.5 ± 1.7 years