No differences in in vivo kinematics between six different types of knee prostheses.
Summary of "No differences in in vivo kinematics between six different types of knee prostheses."
PURPOSE:
The aim of this study was to compare a broad range of total knee prostheses with different design parameters to determine whether in vivo kinematics was consistently related to design. The hypothesis was that there are no clear recognizable differences in in vivo kinematics between different design parameters or prostheses.
METHODS:
At two sites, data were collected by a single observer on 52 knees (49 subjects with rheumatoid arthritis or osteoarthritis). Six different total knee prostheses were used: multi-radius, single-radius, fixed-bearing, mobile-bearing, posterior-stabilized, cruciate retaining and cruciate sacrificing. Knee kinematics was recorded using fluoroscopy as the patients performed a step-up motion.
RESULTS:
There was a significant effect of prosthetic design on all outcome parameters; however, post hoc tests showed that the NexGen group was responsible for 80% of the significant values. The range of knee flexion was much smaller in this group, resulting in smaller anterior-posterior translations and rotations.
CONCLUSION:
Despite kinematics being generally consistent with the kinematics intended by their design, there were no clear recognizable differences in in vivo kinematics between different design parameters or prostheses. Hence, the differences in design parameters or prostheses are not distinct enough to have an effect on clinical outcome of patients. LEVEL OF
EVIDENCE:
Therapeutic study, Level III.
Affiliation
Biomechanics and Imaging Group, Department of Orthopaedics, Leiden University Medical Center, PO Box 9600, J11-S, 2300 RC, Leiden, The Netherlands, N.Wolterbeek@lumc.nl.
Journal Details
This article was published in the following journal.
Name: Knee surgery, sports traumatology, arthroscopy : official journal of the ESSKA
ISSN: 1433-7347
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21761233
- DOI: http://dx.doi.org/10.1007/s00167-011-1605-y
Medical and Biotech [MESH] Definitions
Artificial Organs
Devices intended to replace non-functioning organs. They may be temporary or permanent. Since they are intended always to function as the natural organs they are replacing, they should be differentiated from PROSTHESES AND IMPLANTS and specific types of prostheses which, though also replacements for body parts, are frequently cosmetic (EYE, ARTIFICIAL) as well as functional (ARTIFICIAL LIMBS).
Knee Injuries
Injuries to the knee or the knee joint.
Knee Prosthesis
Replacement for a knee joint.
Arthroplasty, Replacement, Knee
Replacement of the knee joint.
Popliteal Cyst
A SYNOVIAL CYST located in the back of the knee, in the popliteal space arising from the semimembranous bursa or the knee joint.
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