Demographic, baseline and 12-weeks follow-up data from the FORT trial. 88 patients aged over 45 years with symptomatic radiographic first MTP joint osteoarthritis. Intervention was contoured foot orthoses (n = 47) or sham flat insoles (n = 41), worn at all times for 12 weeks. All data presented in the results paper (Osteoarthritis Cartilage. 2022;30(7):956-964) available in XLSX format.