TABLE 5.

Summary of the Grades of Recommendations for the Commonly Used Radiographic Markers to Diagnose Pincer-Type Femoroacetabular Impingement

Radiographic Markers	Level of Evidence	Grade of Recommendation With Proposed Subscale
Crossover sign	Most level 4 studies support its use, level 2 and 3 studies inconclusive	Cf
Posterior wall sign	Most level 4 studies support its use, level 2 and 3 studies inconclusive	Cf
Ischial spine sign	Most level 4 studies support its use, level 2 and 3 studies inconclusive	Cf
Center-edge angle	Most level 4 studies support its use, level 2 and 3 studies inconclusive	Cf
Acetabular index	Most level 4 studies support its use, level 2 and 3 studies inconclusive	Cf
Herniation pit	All level 4 studies show conflicting results	Cc