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

ConclusionsThe available evidence was reviewed critically, recommended criteria for diagnostic imaging highlighted, and the roles/values of different imaging parameters assessed. Radiographic evaluation (AP pelvis and a Dunn 45 ° view) is the cornerstone of hip-imaging assessment and the minimum imaging study that should be performed when evaluating adult patients for FAI. In most cases, cross-sectional imaging is warranted because MRI is the ‘gold standard’ imaging modality for the comprehensive evaluation, different ial diagnosis assessment, and FAI surgical planning.Key Points• Diagnostic imaging for FAI is not standardised due to scarce evidence-based guidance on which imaging modalities and diagnostic criteria/parameters should be used.• Radiographic evaluation is the cornerstone of hip assessment and the minimum study that should be performed when assessing suspected FAI. Cross-sectional imaging is justified in most cases because MRI is the ‘gold standard’ modality for comprehensive FAI evaluation.• For acetabular morphology, coverage (Wiberg’s angle and acetabular index) and version (crossover, posterior wall, and ischial spine signs) should be assessed routinely. On the femoral side, the head–neck junction morphology (α° and offset), neck morphology (NSA), and torsion should be asse ssed.

Source: European Radiology - January 7, 2021 Category: Radiology Source Type: research