The prevalance of femoroacetabular impingement findings on radiological survey of the emergeny service patients with trauma

Abstract

Femoroacetabular impingemet (FAI) is a disease causing hip pain in young-adult population and can be diagnosed frequently on asymptomatic stage. The European studies on this subject show that 20-25% of the population actually has asymptomatic FAI. Actually, there is no study in Turkey on this topic. The purpose of our study is to determine the prevalance of FAI on the X-rays of the patients who applied to the emergency service with trauma.Materials-Methods:Patients applied between September 2015 and January 2016 aged 18-65 and who has pelvis AP and frog leg X-rays were included. Pelvic graphs on which both iliac crests and proximal femurs are seen, the X-ray tube is centralised to the symphysis pubis and the obturator foramens are symmetrical were included. The graphs with fractures or ligamentous injuries affecting the pelvic ring, fractures on long bones of the lower limbs, arthrosis on coxofemoral joint and findings of previous pelvic and hip surgery were excluded. Totally 3487 patients were evaluated and 528 of them were included. Alpha, lateral central edge (LCE), Tönnis and collodiaphyseal angle were measured. The morphological anomalies (FAI, dysplasia) were noted. The measured alpha angle value above 55° graphs were accepted as CAM type; Tönnis angle below 4° angle or LCE angle above 39° were accepted as Pincer type impingement. The graphs with LCE angle below 25° or with Tönnis angle above 10° were considered as dysplasia.Results:The average age of the 528 included patients was 43,38. 323 were female and 205 were male. We determined 15,5% CAM, 11,1% Pincer and 4,7% combined type FAI in these 528 patients.The ratios were noted in female group, 4,6% CAM, 13,3% Pincer and 1,5% combined type; in male group 32,7% CAM, 7,8% Pincer 9,8% combined type. Average alpha angle on pelvis AP graphs was 48,9° on right and 47,8° on left side. Average alpha angle on pelvis frog leg graphs was 51,7° on right, 49,8° on left side. Average LCE angle was 32,9° on right and 34,7° on left side. Average Tönnis angle was 6,7° for right and 5,8° for left side. SPSS.21 were used to analyse the data.Discussion:FAI can be seen in population asymptomatically with a seriously high rates. In our study, we evaluated the asypmtomatic patients with trauma applying to the emergency service and we found radiological FAI findings rate 19,5% in females and 50,2% in males.