Tibial Plateau Coverage in UKA: A Comparison of Patient Specific and Off-The-Shelf Implants

Abstract Poor tibial component fit can lead to issues including pain, loosening and subsidence. Morphometric data, from 30 patients undergoing UKA were utilized; comparing size, match and fit between patient-specific and off-the-shelf implants. CT images were prospectively obtained and implants mode...

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Bibliographic Details
Published in:The Journal of arthroplasty 2014-09, Vol.29 (9), p.1694-1698
Main Authors: Carpenter, Dylan P., MD, Holmberg, Rebecca R., ME, MS, Quartulli, Marc J., BS, Barnes, C. Lowry, MD
Format: Article
Language:English
Subjects:
Arthroplasty, Replacement, Knee - instrumentation
Arthroplasty, Replacement, Knee - methods
Computer Simulation
ConforMIS
CT-based imaging
Humans
Knee Joint - diagnostic imaging
Knee Joint - surgery
Knee Prosthesis
Orthopedics
overhang
patient specific implants
Prosthesis Design
Prosthesis Fitting
Tibia - diagnostic imaging
Tibia - surgery
tibial component
Tomography, X-Ray Computed
unicompartmental knee arthroplasty
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Summary:Abstract Poor tibial component fit can lead to issues including pain, loosening and subsidence. Morphometric data, from 30 patients undergoing UKA were utilized; comparing size, match and fit between patient-specific and off-the-shelf implants. CT images were prospectively obtained and implants modeled in CAD, utilizing sizing templates with off-the-shelf and CAD designs with patient-specific implants. Virtual surgery was performed, maximizing tibial plateau coverage while minimizing implant overhang. Each implant evaluated to examine tibial fit. Patient-specific implants provided significantly greater cortical rim surface area coverage versus off-the-shelf implants: 77% v. 43% medially and 60% v. 37% laterally. Significantly less cortical rim overhang and undercoverage were observed with patient-specific implants. Patient-specific implants provide superior cortical bone coverage and fit while minimizing overhang and undercoverage seen in off-the-shelf implants.
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2014.03.026