Table 5. Means and differences between intervention and control group at each test point in functional performance and muscle strength outcomes.

Variable	Assessment time	Mean control group	Mean (± SD) intervention group	P-value
Quadriceps strength	Baseline	0.88±0.07	0.86±0.07	0.754
	Pre-op Test 1 (mean±SD)	0.86±0.09	0.92±0.10	<0.001
	Δ Baseline - Test 1 mean (95% CI)	0.02 (−0.01, 0.05)	0.06 (0.02, 0.10)	<0.001
	4 weeks post-op (Test 2) (mean±SD)	0.70±0.05	0.75±0.08	0.078
	Δ Baseline - Test 2 mean (95% CI)	−0.18 (−0.15, −0.21)	−0.11 (−0.08, −0.14)	0.001
	12 weeks post-op - Test 3 (mean±SD)	0.87±0.11	0.93±0.11	0.134
	Δ Baseline - Test 3 mean (95% CI)	−0.01 (−0.03, 0.05)	0.07 (0.03, 0.11)	0.009
20-meter walk test	Baseline	19.00±1.20	18.66±0.97	0.179
	Pre-op Test 1 (mean±SD)	18.96±1.12	18.31±0.82	0.004
	Δ Baseline - Test 1 mean (95% CI)	−0.04 (−0.45, 0.53)	−0.35 (−0.72, 0.03)	<0.001
	4 weeks post-op (Test 2) (mean±SD)	18.19±0.89	17.64±0.73	0.002
	Δ Baseline - Test 2 mean (95% CI)	0.81 (0.36, 1.26)	1.02 (0.66, 1.38)	0.023
	12 weeks post-op - Test 3 (mean±SD)	17.83±0.79	17.28±0.64	<0.001
	Δ Baseline - Test 3 mean (95% CI)	1.17 (0.74–1.60)	1.38 (1.03, 1.73)	0.032
30-sec chair stand test	Baseline	12.02±1.30	12.43±1.26	0.214
	Pre-op Test 1 (mean±SD)	12.04±1.27	12.82±1.23	0.005
	Δ Baseline –Test 1 mean (95% CI)	0.02 (−0.52, 0.54)	0.39 (0.14, 0.92)	0.001
	4 weeks post-op (Test 2) (mean±SD)	12.95±1.22	13.93±1.13	0.001
	Δ Baseline - Test 2 mean (95% CI)	0.93 (0.40, 1.96)	1.50 (0.99, 2.00)	<0.001
	12 weeks post-op - Test 3 (mean±SD)	13.20±1.13	14.36±0.99	<0.001
	Δ Baseline –Test 3 mean (95% CI)	1.18 (0.66, 1.70)	1.93 (1.45, 2.41)	<0.001