Table 4. Improvement in Health-Related Quality of Life and Satisfaction after Hip Replacement: A Comparison Between Patients with Mild to Moderate and Severe Radiographical Pre-Operative Osteoarthritis.

SF36 Sub-Scale	Kellgren Grade 0–2:Probability of Achieving a MCID (95%CI)	Kellgren Grade 3+4:Probability of Achieving a MCID (95%CI)	Kellgren Grade 0–2 VS Kellgren Grade 3+4:Adjusted Odds Ratio (95%CI)	P-value
Physical Functioning	64/92∶69.6% (59.5–78.0)	146/185∶78.9% (72.5–84.2)	1.87 (0.97–3.60)	0.06
Role-Physical	55/92∶59.8% (49.6–69.2)	124/185∶67.0% (60.0–73.4)	1.50 (0.82–2.72)	0.19
Bodily Pain	71/92∶77.2% (67.6–84.6)	141/185∶76.2% (69.6–81.8)	1.03 (0.52–2.05)	0.93
General Health	62/92∶67.4% (57.3–76.1)	117/185∶63.2% (56.1–69.9)	0.91 (0.47–1.77)	0.78
Vitality	34/92∶37.0% (27.8–47.2)	54/185∶29.2% (23.1–36.1)	0.84 (0.46–1.55)	0.58
Social Functioning	42/92∶45.7% (35.9–55.8)	80/185∶43.2% (36.3–50.4)	0.87 (0.49–1.55)	0.64
Role Emotional	21/92∶22.8% (15.4–32.4)	51/185∶27.6% (21.6–34.4)	1.01 (0.51–2.01)	0.98
Mental Health	17/92∶18.5% (11.9–27.6)	40/185∶21.6% (16.3–28.1)	1.26 (0.62–2.58)	0.53
NRS Satisfaction >8	53/92∶57.6% (47.4–67.2)	136/185∶73.5% (66.7–79.3)	1.95 (1.06–3.59)	0.03

Odds Ratios >1 indicate a higher probability of achieving a Minimal Clinically Important Difference in HRQoL after THR in patients with Kellgren Grade 3+4, compared to Grade 0–2.

The odds ratios adjusted for age, sex, Charnley Comorbidity Classification and BMI and stratified for quartiles of follow-up.