SOLAR score
PD, GS
We considered the SOLAR score for sonographic evaluation of the knee in active and control groups at 0-, 2-, and 12-week intervals. A semi-quantitative 0–3 grey GS and PD scores were used. The suprapatellar midline longitudinal scan, medial longitudinal scan, lateral longitudinal scan, and posterior longitudinal scan were considered for GS, and a sagittal infrapatellar scan was added for PD score. For the GS score, the range was from 0 to 12 and for PD the score ranged from 0 to 15 [