The Lisbon Agreement on femoroacetabular impingement imaging—part 2: general issues, parameters, and reporting

Imaging assessment for the clinical management of femoroacetabular impingement (FAI) is controversial because a paucity evidence-based guidance and notable variability among practitioners. Hence, expert consensus needed standardised imaging critical practice research. We aimed to establish expert-based statements on FAI by using formal methods building. The Delphi method was used formally derive 30 panel members from 13 countries. Forty-four questions were agreed upon, relevant seminal literature circulated classified in major topics produce answering statements. level evidence noted all statements, asked score their agreement (0–10). This second part three-part series focuses ‘General issues’ ‘Parameters reporting’. Forty-seven generated group reached 45. Twenty-five pertaining (9 addressing diagnosis, differential postoperative imaging) reporting’ (16 femoral/acetabular parameters) produced. available reviewed critically, recommended criteria diagnostic highlighted, roles/values different parameters assessed. Radiographic evaluation (AP pelvis Dunn 45° view) cornerstone hip-imaging minimum study that should be performed when evaluating adult patients FAI. In most cases, cross-sectional warranted MRI ‘gold standard’ modality comprehensive evaluation, diagnosis assessment, surgical planning. • Diagnostic not due scarce which modalities criteria/parameters used. hip assessing suspected Cross-sectional justified cases evaluation. For acetabular morphology, coverage (Wiberg’s angle index) version (crossover, posterior wall, ischial spine signs) assessed routinely. On femoral side, head–neck junction morphology (α° offset), neck (NSA), torsion