In this section
@article{Holthof:2025:10.1002/ksa.12761,
author = {Holthof, SR and Nejima, S and Rock, M and vanArkel, RJ and Brivio, A and Barrett, D and Amis, AA},
doi = {10.1002/ksa.12761},
journal = {Knee Surgery, Sports Traumatology, Arthroscopy},
pages = {3896--3905},
title = {Total knee replacement designs have differing stability under novel robotic testing method in vitro},
url = {http://dx.doi.org/10.1002/ksa.12761},
volume = {33},
year = {2025}
}
TY - JOUR
AB - Purpose:This study implemented a novel robotic test method to quantify the effect of three distinct total knee arthroplasty (TKA) designs on knee kinematics and stability. It was hypothesised that the implant geometries would affect stability and rollback, with differences between the native and replaced knees, as well as between implant designs.Methods:Eight fresh-frozen cadaveric knees were tested across the arc of flexion-extension under 710 N compressive load, combined with either no anterior-posterior (AP) tibial force, 90 N anterior or 90 N posterior drawer force using a robotic actuator. The same testing protocol was used post-TKA using three distinct implant designs (gradually reducing femoral condylar radius medially stabilised, multi-radius medially conforming and single-radius symmetrical), matched to the same bone cuts. Laxity and rollback were analysed using statistical parametric mapping and implant designs were compared to the intact knee and each other.Results:No significant differences in AP laxity were found between the intact knee (4.7 ± 0.7 mm), gradually reducing radius (6.3 ± 1.3 mm) and multi-radius designs (5.7 ± 1.1 mm). The single-radius implant showed significantly larger average AP laxity envelope (11.6 ± 2.3 mm) than the intact knee, the multi-radius design and the gradually reducing radius design and was more variable between knees. The rollback among the intact knee and TKAs were not significantly different: gradual radius 81% of native, multi-radius 85% and single-radius 90%.Conclusions:Significant differences of AP laxity were found between the pre- and post TKA knee and between implant designs. Rollback did not differ significantly. Implanted knee behaviour also showed differences of sensitivity to cadaveric specimen and implantation variation among the prosthesis designs.Clinical relevance:Instability
AU - Holthof,SR
AU - Nejima,S
AU - Rock,M
AU - vanArkel,RJ
AU - Brivio,A
AU - Barrett,D
AU - Amis,AA
DO - 10.1002/ksa.12761
EP - 3905
PY - 2025///
SN - 0942-2056
SP - 3896
TI - Total knee replacement designs have differing stability under novel robotic testing method in vitro
T2 - Knee Surgery, Sports Traumatology, Arthroscopy
UR - http://dx.doi.org/10.1002/ksa.12761
UR - https://doi.org/10.1002/ksa.12761
VL - 33
ER -