A high degree of knee flexion after TKA promotes the ability to perform high-flexion activities and patient satisfaction in Asian population

Table 3 Ability to do high-flexion activities in groups according to final knee flexion after TKA at follow-up

High-flexion activity	Impossible (Estimated proportion, %)^a			Hard to do (Estimated proportion, %)^a			Easy to do (Estimated proportion, %)^a			Odd ratio for easy to do (95% CI)	p-value	p for interaction with time
High-flexion activity	2 years	5 years	10 years	2 years	5 years	10 years	2 years	5 years	10 years	Odd ratio for easy to do (95% CI)	p-value	p for interaction with time
Kneel
Final knee flexion < 130°	80.0	68.8	45.1	14.1	21.0	31.6	5.9	10.2	23.3	1 (Reference)	< 0.001	n.s.
Final knee flexion ≥130°	59.2	50.2	35.5	26.1	29.9	33.3	14.7	19.9	31.3	3.25 (1.88–5.64)	< 0.001	n.s.
Squat
Final knee flexion < 130°	72.9	60.5	37.5	18.6	25.5	33.1	8.5	14.0	29.4	1 (Reference)	< 0.001	n.s.
Final knee flexion ≥130°	47.1	39.4	27.8	31.0	32.8	32.8	22.0	27.8	39.4	3.56 (2.08–6.12)	< 0.001	n.s.
Sit cross-legged
Final knee flexion < 130°	41.5	36.5	28.7	32.4	33.2	33.0	26.0	30.3	38.3	1 (Reference)	< 0.001	n.s.
Final knee flexion ≥130°	13.9	13.9	13.9	25.4	25.3	25.3	60.7	60.8	60.9	5.04 (2.95–8.63)	< 0.001	n.s.
Stand from the floor
Final knee flexion < 130°	14.5	15.1	16.1	59.5	58.4	56.6	25.9	26.5	27.3	1 (Reference)	< 0.001	n.s.
Final knee flexion ≥130°	35.8	29.5	20.6	31.0	37.4	49.0	33.3	33.1	30.4	4.09 (2.21–7.58)	< 0.001	n.s.

n.s. not significant
^a Estimated after adjustment for age, sex, body mass index, bilateral TKA, and patellar resurfacing

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