Etiology of total knee arthroplasty failure and functional outcome of revision knee arthroplasty

Table 1 Comparison of pre- and post-revision functional outcomes, mean ± SD

Variable	Pre-revision	Post-revision	N	P value
KSS	39.43 ± 6.18	78.91 ± 6.17	118	< 0.001
Pain VAS	7.99 ± 1.37	1.42 ± 1.17	118	< 0.001

KSS: Knee Society Score; VAS: Visual Analog Scale.

Table 2 Association between gender and etiology of total knee arthroplasty failure, n (%)

Gender	Infection	Aseptic loosening	Implant wear and tear	Total	P value
Male	33 (50.8)	27 (41.5)	5 (7.7)	65	0.391
Female	21 (39.6)	25 (47.2)	7 (13.2)	53
Total	54 (45.8)	52 (44.1)	12 (10.2)	118

Table 3 Association between type of revision surgery and mobility improvement, n (%)

Type of revision	Improved	Not improved	Total	P value
Single-stage	32 (51.6)	30 (48.4)	62	0.574
Two-stage	26 (46.4)	30 (53.6)	56
Total	58 (49.2)	60 (50.8)	118

Table 4 Comparison of age, body mass index, and time since primary total knee arthroplasty between mobility improvement groups

Variable	Mobility improved (n = 58)	Mobility not improved (n = 60)	P value
Age (years)	60.09 ± 7.01	61.90 ± 7.09	0.165
BMI (kg/m2)	27.96 ± 3.76	28.19 ± 4.08	0.753
Time since primary TKA (years)	7.52 ± 4.40	7.72 ± 4.26	0.803

BMI: Body mass index; TKA: Total knee arthroplasty.