Lateral to Medial Joint Space Ratio is Predictive of Survivorship After Primary Hip Arthroscopy
Authors: Rosinsky PJ, Chen JW, Glein RM, Jimenez AE, Brayboy C, Domb BG
Journal: Arthroscopy, February 2023
DOI: 10.1016/j.arthro.2022.06.025
Background
This study evaluates whether the preoperative lateral-to-medial (L/M) joint space ratio predicts survivorship (avoidance of conversion to hip arthroplasty) after hip arthroscopy for femoroacetabular impingement (FAI).
Methods
- Retrospective analysis of 1,885 patients undergoing hip arthroscopy.
- Preoperative radiographic joint space measurements assessed.
- Minimum 2-year follow-up to determine survivorship.
Key Findings
- The L/M joint space ratio was the strongest predictor of arthroscopy survivorship.
- Patients with an L/M ratio ≥0.75 had a 91.7% survival rate vs 75% in those with ratio <0.75.
Conclusions
The L/M joint space ratio is a significant preoperative metric that may guide surgical decision-making and prognosis in hip arthroscopy.
What Does This Mean for Providers
- Incorporate L/M joint space ratio measurement into preoperative radiographic evaluation to better predict hip arthroscopy outcomes.
- Use this ratio to counsel patients on their risk of needing future hip arthroplasty.
- Consider alternative treatment strategies or closer follow-up for patients with L/M ratios below 0.75 due to higher risk of failure.