The data set relates to the PhD entitled: Biomechanical Effects of Manual Therapy in Patients with Acute Non-specific Low Back Pain - A Feasibility Study. The data set explores the Quantitative Fluoroscopy data for a Randomised Controlled Trial (RCT) exploring the biomechanical effects of Manual Therapy. The two groups included in the trial were manual therapy (n=7) and non-manual therapy (n=7). NOTE: The trial numbers were reduced due to COVID-19 pandemic.