Retrospective Cohort Study
Copyright ©The Author(s) 2025.
World J Orthop. Jul 18, 2025; 16(7): 106281
Published online Jul 18, 2025. doi: 10.5312/wjo.v16.i7.106281
Table 1 Patient demographics and reasons for revision of Truliant posterior stabilized compared to aggregate posterior stabilized, n (%)
Characteristic
Truliant PS (n = 1687)
Aggregate PS (n = 523234)
P value
Average age, years (SD)67.2 (9.7)67.3 (9.4)0.56
Average follow-up, months (SD)31.2 (16.5)56.5 (28.7)< 0.001
Sex0.51
    Male650 (38.5)205110 (39.3)
    Female1037 (61.5)316630 (60.7)
    Missing01494
Charlson index, mean (SD)2.57 (1.41)2.71 (1.47)< 0.001
Fallout due to patient death1 (0.06)3921 (0.75)0.001
Primary osteoarthritis diagnosis< 0.001
    Yes1517 (93.3)497650 (97.3)
    No109 (6.7)13942 (2.7)
Reason for revision
    All cause26 (1.54)10499 (2.0)0.17
    Mechanical complications3 (0.18)803 (0.15)0.80
    Mechanical loosening4 (0.24)1743 (0.33)0.49
    Instability4 (0.24)1152 (0.22)0.88
    Infection9 (0.53)2964 (0.57)0.86
    Periprosthetic fracture0 (0)171 (0.03)0.46
    Other fractures0 (0)424 (0.08)0.24
    Fracture or related sequelae0 (0)448 (0.09)0.23
    Articular surface wear0 (0)38 (0.01)0.73
    Pain0 (0)1175 (0.22)0.05
    Hematoma or wound complication0 (0)302 (0.06)0.32
    All other diagnoses6 (0.36)2921 (0.56)0.26
Table 2 Patient demographics and reasons for revision of Truliant cruciate retaining compared to aggregate cruciate retaining, n (%)
Characteristic
Truliant CR (n = 653)
Aggregate CR (n = 537840)
P value
Age, years (SD)68 (9.1)67.3 (9.3)0.045
Average follow-up, months (SD)28.0 (13.4)52.4 (29.6)< 0.001
Sex0.12
    Male240 (36.8)213312 (39.7)
    Female413 (63.3)323421 (60.3)
    Missing01107
Charlson index, mean (SD)2.74 (1.37)2.68 (1.42)0.32
Fallout due to patient death1 (0.15)3419 (0.64)0.12
Primary osteoarthritis diagnosis< 0.001
    Yes561 (90.2)513415 (97.7)
    No61 (9.8)11846 (2.3)
Reason for revision
    All cause2 (0.31)6974 (1.3)0.025
    Mechanical complications0 (0)486 (0.09)0.44
    Mechanical loosening0 (0)878 (0.16)0.3
    Instability0 (0)855 (0.16)0.31
    Infection0 (0)2078 (0.39)0.11
    Periprosthetic fracture0 (0)60 (0.01)0.79
    Other fractures0 (0)217 (0.04)0.61
    Fracture or related sequelae0 (0)222 (0.04)0.6
    Articular surface wear0 (0)55 (0.01)0.8
    Pain0 (0)819 (0.15)0.32
    Hematoma or wound complication0 (0)179 (0.03)0.64
    All other diagnoses2 (0.31)2133 (0.4)0.71
Table 3 Cumulative percent revision rates for Truliant posterior stabilized compared to aggregate posterior stabilized
Years to revisionCumulative percent revision % (number at risk)
Truliant PS (n = 1687)
Aggregate PS (n = 524921)
00.07 (1687)0.06 (521740)
10.82 (1398)0.8 (484679)
21.37 (1045)1.34 (435662)
31.76 (718)1.73 (385269)
42.05 (366)2.01 (320979)
52.26 (121)2.22 (243128)
62.42 (21)2.37 (162578)
72.53 (21)2.48 (97209)
82.64 (21)2.58 (49027)
92.71 (01)2.65 (18461)
Table 4 Cumulative percent revision rates for Truliant cruciate retaining compared to aggregate cruciate retaining
Years to revisionCumulative percent revision % (number at risk)
Truliant CR (n = 653)
Aggregate CR (n = 537840)
00.01 (653)0.02 (536733)
10.18 (544)0.57 (486846)
20.31 (398)0.95 (420494)
30.39 (208)1.2 (360904)
40.44 (351)1.37 (290143)
50.48 (11)1.51 (216888)
60.52 (11)1.60 (147845)
70.54 (11)1.67 (89727)
80.56 (11)1.73 (45593)
90.56 (01)1.75 (17960)
Table 5 Cumulative percent revision rates across the American Joint Replacement Registry, Australian Orthopaedic Association National Joint Replacement Registry, and United Kingdom National Joint Registry
RegistryPS
CR/minimally stabilized/unconstrained
1 year, rate (95%CI)
3 years, rate (95%CI)
1 year, rate (95%CI)
3 years, rate (95%CI)
AJRR (Truliant data)0.82 (0.51-1.13)1.76 (1.09- 2.43)0.18 (0-0.44)0.39 (0-0.92)
AJRR (non-Truliant data)0.8 (0.78-0.83)1.73 (1.69-1.77)0.57 (0.55-0.59)1.2 (1.17-1.23)
AOANJRR (all non-Truliant data)[13]1.2 (1.1-1.2)2.8 (2.7-2.9)0.9 (0.9-0.9)2.3 (2.3-2.4)
UK NJR (all non-Truliant data)[14]0.48 (0.45-0.5)1.65 (1.6-1.7)0.38 (0.37-0.40)1.33 (1.30-1.36)