Changes in Lower Extremity 3-Dimensional Load-Bearing Axes Before and After Mobile-Bearing Total Knee Arthroplasty

Abstract This study evaluated changes in the lower extremity 3-dimensional load-bearing mechanical axes in the anteroposterior and mediolateral directions before and at 3 weeks after mobile-bearing total knee arthroplasty. The effects of the degrees of anteroposterior constraint of the designs on th...

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Bibliographic Details
Published in:The Journal of arthroplasty 2012-06, Vol.27 (6), p.1203-1209
Main Authors: Ishii, Yoshinori, MD, Noguchi, Hideo, MD, Takeda, Mitsuhiro, MD, Sato, Junko, MD, Ezawa, Nobukazu, RT, Toyabe, Shin-Ichi, MD
Format: Article
Language:English
Subjects:
Aged
Aged, 80 and over
Arthroplasty, Replacement, Knee - instrumentation
Arthroplasty, Replacement, Knee - methods
Biomechanical Phenomena
Female
Humans
Knee Joint - diagnostic imaging
Knee Joint - physiology
Knee Prosthesis - classification
Lower Extremity - diagnostic imaging
Lower Extremity - physiology
Male
meniscal-bearing TKA
Middle Aged
Orthopedics
Osteoarthritis, Knee - surgery
Posterior Cruciate Ligament - surgery
Prosthesis Design
rotating-platform design TKA
three-dimensional load-bearing axes
Tomography, X-Ray Computed
Treatment Outcome
Weight-Bearing - physiology
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Summary:Abstract This study evaluated changes in the lower extremity 3-dimensional load-bearing mechanical axes in the anteroposterior and mediolateral directions before and at 3 weeks after mobile-bearing total knee arthroplasty. The effects of the degrees of anteroposterior constraint of the designs on the location of the load-bearing mechanical axis at the knee joint level were also assessed. We evaluated 151 knees from 134 patients with 74 knees receiving meniscal bearing-type and 77 knees receiving rotating platform-type prostheses. In the mediolateral direction, both designs showed significant improvements, whereas in the anteroposterior direction, they revealed no improvements postoperatively and were worsened significantly in meniscal bearing type. Differences in the degree of bone and soft tissue involvement for the correction of alignment may explain the findings.
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2011.12.013