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Table 4 Comparison between the two groups with regard to one-year functional recovery

From: Active ankylosing spondylitis increases blood loss during total hip arthroplasty for a stiff hip joint

 Stable disease group (n = 17)Active disease group (n = 32)P
Preoperative VAS5.34 ± 1.726.30 ± 2.080.110
Postoperative VAS2.34 ± 1.532.51 ± 1.690.724
Preoperative ROM
 Hip ankylosis13 (76%)25 (78%)0.582
 The rest ROM in flexion(°)33.75 ± 7.539.36 ± 6.82N
 The rest ROM in extension(°)8.75 ± 4.789.71 ± 2.98N
Postoperative ROM
 ROM in flexion(°)79.41 ± 12.8581.41 ± 12.520.601
 ROM in extension(°)14.71 ± 3.2914.38 ± 4.350.785
 Preoperative HHS32.90 ± 7.9829.59 ± 8.960.208
 Postoperative HHS88.68 ± 3.6288.03 ± 4.390.604
  1. VAS visual analog scale, ROM range of motion, HHS Harris hip score
  2. chi-square test, the rest- Student t-test;