Does the change between the native and the prosthetic posterior tibial slope influence the clinical outcomes after posterior stabilized TKA? A review of 793 knees at a minimum of 5 years follow-up

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Table 2

Preoperative and postoperative clinical and radiological assessment between both groups.

	Preoperative			Postoperative
	Group ≤ 10° (n = 703)	Group > 10° (n = 90)	P value	Group ≤ 10° (n = 703)	Group > 10° (n = 90)	P value
	Mean ± SD	Mean ± SD		Mean ± SD	Mean ± SD
	Min/Max	Min/Max		Min/Max	Min/Max
Flexion	119.0 ± 14.7	118.0 ± 14.4	0.54	120.0 ± 11.9	123.0 ± 8.3	0.026
Flexion	60/140	70/140	0.54	70/140	70/140	0.026
Knee IKS score	60.2 ± 16.0	57.1 ± 17.0	0.1	89.5 ± 10.7	89.7 ± 10.2	0.89
Knee IKS score	9/93	20/86	0.1	24/100	39/100	0.89
Function IKS score	62.6 ± 15.6	64.4 ± 15.1	0.28	88.2 ± 15.7	86.3 ± 16.6	0.33
Function IKS score	10/100	20/95	0.28	20/100	20/100	0.33
Total IKS score	123.0 ± 27.5	122.0 ± 28.1	0.66	177.0 ± 22.5	176.0 ± 22.4	0.69
Total IKS score	36/193	84/200	0.66	69/200	84/200	0.69
HKA	176.0 ± 7.4	175.0 ± 8.5	0.11	179.0 ± 2.6	179.0 ± 2.7	0.47
HKA	158/202	162/202	0.11	156/186	172/186	0.47
mFA°	91.6 ± 3.29	91.1 ± 3.61	0.21	89.8 ± 1.9	89.6 ± 1.9	0.29
mFA°	83/103	82/101	0.21	82/98	85/96	0.29
mTA°	86.7 ± 5.8	86.6 ± 4.2	0.87	89.2 ± 1.8	89.3 ± 1.8	0.63
mTA°	75/102	76/97	0.87	79/95	82/94	0.63
PTS	6.6 ± 3.2	13.6 ± 2.4	<0.001	1.6 ± 1.6	0.9 ± 1.8	<0.001
PTS	−16/15	8/21	<0.001	−3/7	−5/7	<0.001
Slope difference				4.96 ± 3.2	12.7 ± 1.8	<0.001
Slope difference				−16/10	11/19	<0.001

HKA°: Hip Knee ankle angle, mFA°: mechanical femoral frontal angle, mTA°: mechanical tibial frontal angle, IKS: International Knee Society score, PTS: Posterior tibial slope, SD: standard deviation.

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