Intervention
No treatment was given to the participants in this study although participants had previously received a single LR-PRP injection (group 1), a single CSI (group 2) or a single CSI followed by a LR-PRP injection (group 3) as described by the methodology and protocol of Fitzpatrick et al. [Where possible, scans were taken on the same machine. The MRI machine used a Skyra 3-T superconducting unit and Numaris/4 Syngo MR 11 software (Siemens), with a slew rate of 200 T/m/s, 45 mT/m gradient amplitude with a high-resolution 18-channel surface coil anteriorly and the 32-channel body coil posteriorly. Multiplanar sagittal, axial, and coronal proton density and fat saturated T2 weighted images were taken. Where it was not possible for participants to access this machine, scans were performed using standard protocols based on the European Society of Skeletal Radiology guidelines [