Introduction: Coxitis is a spondyloarthritis( SpA) serious complication. Indeed, its outcome on young and active ground alters both functional prognosis and life quality.
The objective of this study was to evaluate structural damage of the spine, sacroiliacs, and the hip, Tunisian Spondyloarthrities patients with hip involvement
Methods: This is a transversal study, including SpA  patients (satisfying ASAS criteria 2009) with hip involvement. Demographic and clinical data were collected and analyzed. Structural sacroiliacs and hip evaluation was made using X-ray of the pelvis and  BASRI hip. Radiographic forms of hip disease were evaluated. Sacroiliac involvement was assessed using the Forestier classification. The structural damage of the spine was evaluated on face and profile radiographs of the cervical and lumbar spine. Two scores have been used: BASRI score (Bath Ankylosing Spondylitis Radiologic Index), and mSASSS (modified stoke Ankylosing Spine Score).
Results: Ninety four patients were evaluated (77men). The mean age was 41,53 ±11,97 years. The median age at disease onset was 26,23±10,29 years. The mean diagnostic delay was 6,48 years. A peripheral joint involvement was found in 33% of cases. Extra-articular manifestation was seen in 57% of patients: osteoporosis (16 patients), uveitis (15 patients), psoriasis (10 patients), and chronic inflammatory bowel disease (12 patients). 78 patients had bilateral hip involvement. The median BASDAI and BASFI scores were respectively 5,4 and  5,5. The mean m-SASSS score was 7,51 at the cervical spine and 8,73 at the lumbar spine with a total mSASSS score of 15,34. Sacroiliitis grade was 2 in 17%, 3 in  37% and 4 in 46% of cases. 147 hips were evaluated: Patients had an early form of hip disease  in 22% of cases, Condensing form in 3% of  cases, combined forms in 22% of cases and destructive form in 53% of cases. Mean BASRI-hip score was 2,07.
Conclusion: Our findings confirm tunisian observations that studied Spa with hip involvement. This population had a particularly severe structural damage of the spine.

Evaluation of structural damage of the spine, sacroiliacs and the hip in Tunisian Spondyloarthrities patients with hip involvement