The influence of tibial morphology on the design of an anatomical tibial baseplate for TKA.

Hartel, Maximilian J; Loosli, Yannick; Delfosse, Daniel; Diel, Peter; Thali, Michael; Ross, Steffen; Kohl, Sandro; Eggli, Stefan (2014). The influence of tibial morphology on the design of an anatomical tibial baseplate for TKA. The knee, 21(2), pp. 415-419. Elsevier 10.1016/j.knee.2014.01.003

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BACKGROUND Finding the right balance between tibial coverage and minimal implant overhang is an important factor in TKA. Another significant cause of failure is component malrotation. METHODS An average master shape of the proximal tibia at TKA resection level was calculated using fine slice computed tomographies of 117 cadaveric knees. To find out whether alternate implant contours would be necessary depending on the patient's body size, we established five subgroups to compare. CAD-Analysis was performed to simulate the overhang produced after ±4°/±7°/±10° rotation. RESULTS A master shape for the tibial resection cut (with a 5° posterior slope, 7 mm under lateral joint line) could be determined. Neither left vs. right knee joint, nor male vs. female nor the size subdivision appears to alter the calculated master shape significantly. The optimized shape allowing for ±4° of rotational freedom was found to be the best variant. CONCLUSIONS Valid methods have been obtained to design a two-dimensional average shape of the tibial plateau. The modifications described in this study might come in useful, when designing future implant designs. CLINICAL RELEVANCE An optimized fit at the tibial plateau and lower rates of component malrotation may result in better outcomes after TKA.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Kohl, Sandro

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0968-0160

Publisher:

Elsevier

Language:

English

Submitter:

Stefanie Zurbuchen

Date Deposited:

11 Feb 2015 13:11

Last Modified:

27 Apr 2017 10:38

Publisher DOI:

10.1016/j.knee.2014.01.003

PubMed ID:

24503228

Uncontrolled Keywords:

Prosthesis design, Tibial component, Tibial plateau, Total knee arthroplasty (TKA)

BORIS DOI:

10.7892/boris.62962

URI:

https://boris.unibe.ch/id/eprint/62962

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