AB0841 Analysis of the functional state of hip joints (HJ) before total hip arthroplasty (THA) in patients with ankylosing spondylitis (AS): data of a retrospective analysis

Background Injury of hip joint (HJ) in patients (pts) with ankylosing spondylitis (AS) is considered as a factor unfavorable prognosis, which can lead to rapid disability pts. Objectives To assess the functional state HJ before performing THA AS. Methods This retrospective study included 170 pts verified diagnosis AS, who met modified New York criteria 1984, were treated traumatological and orthopedic department period from 1998 2020, was routinely performed all Most male (80.6%). 64% them did not work due disease. Functional insufficiency joints at time surgical treatment 64.1% cases corresponded III grade, 26.5% - IV 9.4% II grade. 82.9% had low activity disease according BASDAI index 17.1% high activity. 53 (31.1%) receiving bDMARDs 87% TNF-alpha inhibitors. The Harris quantitative scale used HJ. Results: Parameter All (n=170) (+) n=53 (-) n=117 Age, years, Me±δ 38,1±11,3 37,5±12,3 38,3±10,8 Age AS debut, Me± δ 20,7±8,4 21,2±8,4 20,5±8,4 diagnosis, 27,6±9,1 27,6±9,9 27,6±8,9 Average delay 6,8±5,8 6,4±4,3 7,1±6,4 duration disease, 17,0±8,5 16,2±8,0 17,5±8,7 pain HJ, 7,4±4,8 6,1±2,2* 8,0±5,4 level VAS, 72,3±14,0 69,9±12,9 73,4±14,5 overall score on surgery 38,0±15,4 42,1±15,0 36,1±15,3 * average scale, VAS,, 15,6±8,4 17,5±8,3 14,7±5,5 Antalgic Gait (absent/mild/moderate/severe), % 42,9/42,9/11,8/2,4 41,5/35,8/18,9/3,8 43,6/46,2/8,5/1,7 Walking distance (unlimited /1500 meters /500 meters/in apartment/unable walk), 2,4/21,2/0,6/44,7/27,1/4,1 2,4/21,7/44,7/27,1/4,1 3,4/21,6/45,2/26,4/3,4 Additional support (missing/walking stick for long distances/walking permanently/one crutch/two walking sticks/two crutches), 30,6/5,3/4,1/29,5/4,1/26,4 22,6/7,5/3,8/24,5/7,5/34,0 34,2/4,3/4,3/31,6/2,6/23,0 Putting shoes (without difficulty/ impossible) 4,2/65,8/30,0 7,4/67,9/24,5 3,4/64,9/33,3 Fixed adduction (<10°/>10°), 30,0/70,0 26,4/73,6 31,6/68,4 internal rotation (<10°/>10°) 22,9/77,1 21,4/78,6 Flexion contracture (<15°/>15°), 39,4/60,6 41,5/58,5 38,5/61,5 p<0,05 Conclusion vast majority pronounced severe disorders 38.0±15.4. (85.9%) moderate lameness, need additional 69.4% cases. Objective signs (fixed inward reduction, flexion contracture) detected more than half According assessment most parameters there no significant differences between without bDMARDs, except value (6.1±2.2 vs 8.0±5.4 42 36, respectively, p<0.05 both cases). Disclosure Interests None declared