Reliable and Fully Automated 3D Surface Topographic Measurements are Highly Correlated with the Trunk Appearance Perception Scale (TAPS) in Adolescent Idiopathic Scoliosis Patients
2Pediatric Orthopedics, Dana Dwek Children's Hospital - Tel Aviv Medical Center, Israel
3Department of Rehabilitation, Hospital for Special Surgery, USA
4Department of Mechanical Engineering, Technion-Israel Institute of Technology, Israel
5Department of Computer Science, Technion-Israel Institute of Technology, Israel
6Department of Orthopedic Surgery, Boston Children's Hospital, USA
Purpose:
Radiographic measurements including Cobb angle demonstrated poor to moderate correlation with patient reported outcome measures (PROMs) such as TAPS. Several groups demonstrated similar weak (R <0.45) but significant (p<0.05) correlations between specific surface topographic (ST) measurements and PROMs (e.g., TAPS). This study purpose is to determine reliability of ST measurements and their correlation with TAPS self-image scores.
Methods:
A prospective cohort of 92 AIS patients (age 11-21) and 27 age-matched controls underwent standardized clinical assessment, whole-body surface scanning (3dMD) and completed TAPS PROMs. Repeated scans by two observers were obtained on a subset of this cohort. The AIS group also completed whole-body EOS biplanar imaging that demonstrated cobb angles from 6.39-78.94 degrees. A series of trunk asymmetry measures were computed from ST scans using a markerless fully automated pipeline. Reliability was assessed for each measurement, and linear regressions were fitted to predict TAPS outcomes.
Results: Conclusion:
Trunk ST measures had good to excellent reliability with ICCs between 0.83-0.92. ST measurements - Principal Axis, Posterior Rib Prominence Volume, and Chest Volume Asymmetry all demonstrated significant correlation with TAPS (0.53
ST measurements can be obtained rapidly using a markerless workflow and fully automated algorithms to provide objective analysis of symmetry, body shape and changes over time in a clinical setting without using ionizing radiation. In this large prospective registry, 3D topographic measures correlate as closely with self-image (TAPS) as standard radiographic measures (Cobb angle). Reliable and clinically significant ST parameters will facilitate comparison of surgical techniques and potentially advance 3D classification systems.