Open AccessMalpositioning of Prosthesis: Patient-specific Total Knee Arthroplasty Versus Standard Off-the-Shelf Total Knee Arthroplasty
Author(s) -
KyoungTak Kang,
JungWoo Son,
Ohchan Kwon,
YongGon Koh
Publication year - 2017
Publication title -
journal of the american academy of orthopaedic surgeons. global research and reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.358
H-Index - 2
ISSN - 2474-7661
DOI - 10.5435/jaaosglobal-d-17-00020
Subject(s) - medicine , valgus , prosthesis , medial collateral ligament , total knee arthroplasty , unicompartmental knee arthroplasty , arthroplasty , surgery , orthodontics , ligament , osteoarthritis , alternative medicine , pathology
A recent study has challenged the premise that a patient-specific (PS)–designed total knee arthroplasty (TKA) component has better clinical survival than an off-the-shelf (OTS) prosthesis. Methods: We developed the finite element models for PS TKA and OTS TKA with 5° varus and valgus malalignment and 5° internal and external malrotations. Results: Contact stress on the medial side of the insert increased with internal femoral malrotation and varus tibial malalignment, but it decreased with external femoral malrotation and varus tibial malalignment in both PS TKA and OTS TKA. An increase in ligament force occurred in valgus malalignment and external malrotation, and in particular, the force exerted on the medial collateral ligament increased. However, PS TKA provided better biomechanical effects than did the standard OTS TKA with malpositioning in TKA. Discussion: These results emphasize the importance of precise surgical preservation in regard to the TKA position.