Diagnostic Evaluation of Hip Labral Tears

Initial Radiographic Assessment

The American College of Radiology recommends obtaining plain radiographs in all patients to exclude fractures, dysplasia, femoroacetabular impingement, and degenerative changes before advanced imaging. 1

The American College of Radiology states that direct intra‑articular injection of dilute gadolinium during MR arthrography provides superior visualization by distending the joint and outlining labral defects. 1

According to the American College of Radiology, musculoskeletal ultrasound demonstrates a sensitivity of approximately 94 % for detecting hip labral tears when compared with MR arthrography in a single study. 1
The American College of Radiology notes that ultrasound can reliably diagnose most anterior acetabular labral tears. 1
The American College of Radiology cautions that ultrasound is highly operator‑dependent and is best suited for evaluating superficial hip structures. 1

The American College of Radiology recommends image‑guided intra‑articular injection of anesthetic, with or without corticosteroid, as both a diagnostic and therapeutic maneuver for suspected hip labral pathology. 1
Pain relief following the injection confirms that the source of discomfort is intra‑articular, supporting the diagnosis of a labral tear. 1
All intra‑articular injections should be performed under imaging guidance to ensure accurate placement. 1

Step 1: Obtain plain radiographs first to assess for structural abnormalities (as per ACR guidance). 1
Step 4 (when MR arthrography is contraindicated): Consider CT arthrography or ultrasound as alternative imaging options (ultrasound supported by ACR data). 1

The American College of Radiology recommends MR arthrography as the gold standard for confirming and fully characterizing labral tears, with a rating of 9/9 (usually appropriate) according to ACR Appropriateness Criteria 2, 3
Standard MRI without arthrography has limitations in fully evaluating labral pathology, with a rating of only 6/9 (may be appropriate) 2
CT arthrography is an alternative with a rating of 7/9 (usually appropriate) if MR arthrography is contraindicated 2
Direct MR arthrography with intra-articular injection of dilute gadolinium solution provides superior visualization of labral tears compared to standard MRI 4
High-resolution 3T MRI may improve visualization of the acetabular labrum and associated pathology, potentially obviating the need for arthrography in some cases 5

Diagnostic intra-articular anesthetic and corticosteroid injections can be both diagnostic and therapeutic, with a rating of 5/9 (may be appropriate) 2, 3
Arthroscopic techniques are the standard surgical approach, allowing for minimally invasive access to the labral tear 6

Untreated labral tears may lead to persistent pain, progressive cartilage damage, and potential development of osteoarthritis 6
For small labral tears with associated small delaminated cartilage lesions (<3 cm²), debridement followed by microfracture or repair may be indicated 6
Larger associated cartilage lesions (>3 cm²) require more complex management approaches 6