Functional improvement measured by the OHS Pain improvement measured by the NPS Reporting ≥50% improvement Age       ≤55 Yr. 11.1 (1.6-77.8) 0.8 (0.3-2.5) 2.8 (1.2-6.7) >55 Yr. 1 (Reference) 1 (Reference) 1 (Reference)   BMI       <25 1.8 (0.4-9) 0.9 (0.3-2.7) 1.4 (0.5-3.5) ≥25 1 (Reference) 1 (Reference) 1 (Reference)   Gender       Female 0.9 (0.2-4.8) 0.7 (0.2-2.3) 1.7 (0.7-4.5) Male 1 (Reference) 1 (Reference) 1 (Reference)   Severity Grade       KL1 (mild) 0.2 (0.0-1.4) 0.6 (0.2-1.9) 1.8 (0.7-4.4) KL2-4 (moderate/severe) 1 (Reference) 1 (Reference) 1 (Reference)

OHS model included patients who had OHS baseline score of 40 or below, NPS model included patient who had NPS baseline score of 2 or higher, BMI: body mass index, KL: Kellgren-Lawrence scale. Ns in each model were the following: 44 (OHS), 59 (NPS) and 100 (percentage improvement rating)

Table 4: Odds ratios (and 95% confidence intervals) of improvement reported on the functional and symptomatic scales by predictive factors*