Comprehensive Summary
Minimum joint space width (mJSW) is explored as a metric able to indicate osteoarthritis progression in the hip. 300 annotated radiographs were used to train a deep learning (DL) algorithm to measure mJSW in native hips on antero-posterior (AP) pelvis radiographs. Trained annotators measured the mJSW in 375 additional images in order to establish a baseline with which to measure the DL algorithm's success. The mean absolute error between the human and DL algorithm’s measurement was 0.87 +/- 1.05 mm. In 70%, 84%, and 90% of the 375 cases compared against, the algorithm’s measurement was within 1 mm, 1.5 mm, and 2 mm, respectively. A value, however, could only be interpreted 92.3% of the time. Radiographic findings and a patient's reported osteoarthritis symptoms don’t always align. Future algorithms should consider data sets detailing patient-reported outcomes.
Outcomes and Implications
Traditionally, mJSW has been measured manually, a labor-intensive and error-prone process that requires expertise and precision. With the growing prevalence of osteoarthritis, there is an urgent need for a faster and more reliable method to assess joint health. Utilizing DL, algorithms could be used by physicians to calculate the mJSW and accelerate the delivery of quality medical interventions pertaining to osteoarthritis. Currently, the model presented in the article provides an improvement to previously designed autonomous models for measuring mJSW, but no timeline for clinical implementation was discussed.