Dunn View Alpha Angle More Useful Than Femoral Head-Neck Offset to Predict Acetabular Cartilage Damage in Patients With Femoroacetabular Impingement Syndrome Undergoing Hip Arthroscopy
Authors: Shapira J, Owens JS, Jimenez AE, Maldonado DR, Rosinsky PJ, Ankem HK, Peskin B, Lall AC, Domb BG
DOI: 10.1016/j.arthro.2021.08.039
Background
Accurately predicting acetabular cartilage damage preoperatively in FAIS patients is critical for surgical planning. This study evaluates the diagnostic utility of radiographic measures—Dunn view alpha angle versus femoral head-neck offset.
Methods
FAIS patients undergoing hip arthroscopy were assessed using preoperative radiographs. The predictive value of the Dunn view alpha angle and head-neck offset was analyzed against intraoperative cartilage damage grading.
Key Findings
- The Dunn view alpha angle showed a stronger correlation with intraoperative acetabular cartilage damage than the femoral head-neck offset.
- A higher alpha angle was associated with increased severity of cartilage damage.
Conclusions
The Dunn view alpha angle is a superior radiographic marker for anticipating acetabular cartilage damage in FAIS patients undergoing hip arthroscopy.
What Does This Mean for Providers?
- When evaluating FAIS patients preoperatively, prioritize the Dunn view alpha angle over femoral head-neck offset for predicting articular cartilage damage.
- Use of this metric may enhance surgical planning, including timing of intervention and consideration for labral preservation or reconstruction.
- Incorporating alpha angle measurements into routine radiographic assessment can refine patient counseling and expectations.