Functional and clinical outcome with modified lateral approach total hip arthroplasty in stiff hips with ankylosing spondylitis

Table 1 Comparison of preoperative and follow-up flexion, range of movement, and Harris hip score

Movement	Preoperative	Follow-up	Mean difference (95%CI)	P value
Flexion	29.35	102.17	65.76 ± 71.37	< 0.0001
ROM total	45.29	220.65	132.97 ± 171.86	< 0.0001
ROM score	1.71	4.95	3.33 ± 3.18	< 0.0001
MHHS	17.03	90.66	53.84 ± 72.16	< 0.0001

ROM: Range of movement; MHHS: Modified Harris hip score.