Validation of a Risk Calculator for Conversion of Hip Arthroscopy to Total Hip Arthroplasty in a Consecutive Series of 1400 Patients
Authors: Rosinsky PJ, Go CC, Shapira J, Maldonado DR, Lall AC, Domb BG
DOI: 10.1016/j.arth.2019.04.013
Background
- Not all patients benefit equally from hip arthroscopy; some may progress to THA.
- A previously published risk calculator aimed to predict this conversion risk. This study validates its clinical utility.
Methods
- 1,400 hip arthroscopy patients were included in a retrospective analysis.
- The performance of the calculator was evaluated at predicting THA conversion at 2- and 4-year follow-ups.
- Inputs included patient age, Tönnis grade, preoperative scores, and femoral version.
Key Findings
- The risk calculator predicted THA conversion with 75% accuracy at 2 years and 73% at 4 years.
- It showed reliable discrimination across age groups and varying preoperative pathology.
Conclusions
- The calculator is a useful tool for anticipating future THA after hip arthroscopy and can improve patient counseling and risk stratification.
What Does This Mean for Providers?
- Use of this validated risk calculator can enhance shared decision-making, especially for patients with borderline indications for arthroscopy.
- It can help guide discussions on expected surgical outcomes, alternative treatments, or earlier consideration of arthroplasty in high-risk cases.
- Especially useful in older patients, those with advanced joint degeneration, or borderline dysplasia.