Effect of osteoarthritic knee flexion deformity correction by total knee arthroplasty on sagittal spinopelvic alignment in Indian population

Table 1 Table showing pre and post-operative sagittal spinopelvic parameters

No.	Variable	Pre-op, median (IQR)	Post-op, median (IQR)	P value
1	PT	14.4 (10.1-18.4)	14.1 (10.6-18.6)	0.455
2	PI	49.3 (44-54.9)	50.9 (44.5-57.5)	0.148
3	SS	36.4 (29.2-40.3)	36.7 (28.5-41.1)	0.551
4	LL	-46.8 (-53.6 to -42)	-48.0 (-53.6 to -40.3)	0.390
5	SVA	44.1 (3.0-78.5)	46.8 (21.7-77.0)	0.153

LL: Lumbar lordosis; PI: Pelvic incidence; PT: Pelvic tilt; SS: Sacral slope; SVA: Sagittal vertical axis.

Table 2 Table showing sub-group analysis between group A and group B

No.	Variable	Group A, n = 15			Group B, n = 17
		Pre-op, median (IQR)	Post-op, median (IQR)	P value	Pre-op, median (IQR)	Post-op, median (IQR)	P value
1	PT	14.9 (11.1-20.8)	14 (7.2-20.4)	0.35	14.0 (9.4-18.2)	14.4 (12.2-17)	0.540
2	PI	45.3 (43.6-54.6)	51.6 (44-6-61.6)	0.124	48.6 (44.2-56.3)	48.3 (42-55.7)	0.603
3	SS	35.2 (29.5-39.5)	37.7 (30.6-42.3)	0.413	36.9 (26.7-41.8)	35.1 (26.5-40.6)	0.890
4	LL	-46.4 (-49.7 to -43.8)	-48.5 (-55.6 to -42.5)	0.639	-47.8 (-56 to -40.6)	-47.5 (-52.5 to -38.5)	0.579
5	SVA	42.9 (-36.6-78.7)	63.7 (28.2-78.1)	0.107	50.1 (17.4-79.0)	28.2 (18.9-78.0)	0.747

LL: Lumbar lordosis; PI: Pelvic incidence; PT: Pelvic tilt; SS: Sacral slope; SVA: Sagittal vertical axis.

Table 3 Showing sub-group analysis of unilateral and bilateral total knee arthroplasty

No.	Variable	Unilateral, n = 10			Bilateral, n = 22
		Pre-op, median (IQR)	Post-op, median (IQR)	P value	Pre-op, median (IQR)	Post-op, median (IQR)	P value
1	PT	14 (10.1-23.4)	13.8 (9.4-21.4)	0.625	14.5 (9.8-18.3)	14.1 (11.2-17.2)	0.406
2	PI	51.1 (44.4-54.3)	52 (41.6-63.0)	0.193	48.5 (43.7-56.1)	49.5 (44.5-54.9)	0.384
3	SS	36.7 (28.6-38.5)	37.2 (27.9-43.9)	0.322	35.7 (28.9-41.7)	36.4 (28.4-39.8)	0.943
4	LL	-44.5 (-55.4 to -38.2)	-48 (-57.8 to -36)	0.959	-47.5 (-54 to -43.2)	-48 (-53.6 to -40.9)	0.867
5	SVA	47.7 (20.6-83.2)	52.0 (26.1-83.6)	0.375	42.5 (-2.9-79.1)	33.4 (19.9-77.2)	0.443

LL: Lumbar lordosis; PI: Pelvic incidence; PT: Pelvic tilt; SS: Sacral slope; SVA: Sagittal vertical axis.

Table 4 Sub-group analysis of males and females

No.	Variable	Males, n = 9			Females, n = 23
		Pre-op	Post-op	P value	Pre-op	Post-op	P value
1	PT	13.7	13.2	0.571	15.7	17.1	0.660
2	PI	48.6	48.8	0.335	50.1	52.1	0.771
3	SS	34.9	35.5	0.967	34.4	34.9	0.934
4	LL	-49.6	-45.7	0.201	-46.2	-47.0	0.837
5	SVA	50.1	69.6	0.837	32.6	44.5	0.409

LL: Lumbar lordosis; PI: Pelvic incidence; PT: Pelvic tilt; SS: Sacral slope; SVA: Sagittal vertical axis.