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Effect of single-radius design on in vivo kinematics during stair activities after total knee arthroplasty.
- Source :
-
Journal of orthopaedic surgery (Hong Kong) [J Orthop Surg (Hong Kong)] 2024 Jan-Apr; Vol. 32 (1), pp. 10225536241246326. - Publication Year :
- 2024
-
Abstract
- Background: The single-radius design is one of the major total knee arthroplasty (TKA) designs and widely used all over the world. The objective of this study was to compare in vivo kinematics between the anteroposterior (AP) single-radius design with mediolateral (ML) single-radius (Non Restricted Geometry; NRG) and ML dual-radius (Triathlon) during stair activities.<br />Methods: A total of 21 knees in 18 patients (NRG group: 10 knees in 7 patients, Triathlon group: 11 knees in 11 patients) with a clinically successful posterior stabilized TKA were examined. Under fluoroscopic surveillance, each patient performed stair ascending and descending motions. In vivo kinematics were analyzed using 2D/3D registration technique. The knee flexion angle, rotation angle, varus-valgus angle, AP translation of the femorotibial contact point for both the medial and lateral sides of the knee, and post-cam engagement were evaluated.<br />Results: There were no significant differences between the two groups in rotation angle and AP translation at each flexion angle. Examining the varus-valgus angle, the NRG group showed varus position at an early flexion angle during both stair activities.Post-cam engagement was observed in both groups during both stair activities. The mean flexion angle of engagement in the NRG group, the post of which was located anterior to the Triathlon, was larger than that in the Triathlon group during both stair activities.<br />Conclusion: Despite the same AP single-radius TKA, ML single-radius might affect varus motion at an early flexion angle.<br />Competing Interests: Declaration of conflicting interestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
- Subjects :
- Humans
Biomechanical Phenomena
Aged
Male
Female
Middle Aged
Knee Joint physiopathology
Knee Joint surgery
Osteoarthritis, Knee surgery
Osteoarthritis, Knee physiopathology
Aged, 80 and over
Arthroplasty, Replacement, Knee methods
Knee Prosthesis
Range of Motion, Articular
Stair Climbing physiology
Prosthesis Design
Subjects
Details
- Language :
- English
- ISSN :
- 2309-4990
- Volume :
- 32
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Journal of orthopaedic surgery (Hong Kong)
- Publication Type :
- Academic Journal
- Accession number :
- 38652873
- Full Text :
- https://doi.org/10.1177/10225536241246326