Abstract
Abstract
Purpose
One of the major contributors to the progression of knee osteoarthritis (OA) is the condition of loading in the knee joint. Innovatively designed load-sharing implants may be effective in terms of reducing joint load. The effects of these implants on contact joint mechanics can be evaluated through cadaver experiments. In this work, a case study is carried out with cadaver knee specimens to carry out a preliminary investigation into a novel load-sharing knee implant, in particular to study the surgical procedures required for attachment, and to determine the contact pressures in the joint with and without the implant.
Methods
Contact pressure in the tibiofemoral joint was measured using pressure mapping sensors, with and without the implant, and radiographs were conducted to investigate the influence of the implant on joint space. The implant was designed from a 3D model of the specimen reconstructed by segmenting MR images of the knee, and it was manufactured by CNC machining.
Results
It was observed that attachment of the implant does not affect the geometry of the hard/soft tissues. Radiographs showed that the implant led to an increase in the joint space on the medial side. Contact pressure measurements showed that the implant reduced the load on the medial side by approximately 18% under all tested loading conditions. By increasing the load from 800 to 1600 N, the percentage of load reduction in the lateral side was decreased by 8%. After applying 800, 1200, and 1600 N load it was observed that the peak contact pressures were 3.7, 4.6, and 5.5 MPa, respectively.
Conclusions
This new knee implant shows some promise as a treatment for OA, through its creation of a conducive loading environment in the knee joint, without sacrificing or damaging any of the hard or soft tissues. This device could be as effective as, for example, the Atlas® system, but without some complications seen with other devices; this would need to be validated through similar results being observed in an appropriate in vivo study.
Publisher
Springer Science and Business Media LLC
Subject
Orthopedics and Sports Medicine
Reference26 articles.
1. Arendt EA, Miller LE, Block JE (2014) Early knee osteoarthritis management should first address mechanical joint overload. Orthop Rev 6:21–23
2. Cheong K (2012) Design and development of a new knee prosthesis design (ME thesis). University of Auckland, Auckland
3. Farr J, Gomoll AH (2018) Cartilage restoration: practical clinical applications. Springer New York, US. https://doi.org/10.1007/978-3-319-77152-6
4. Fojtik E (2017) Finite element analysis of tibiofemoral contact mechanics (MSc thesis). Western Michigan University, Kalamazoo
5. Hayes DA, Waller CS, Li CS, Vannabouathong C, Sprague S, Bhandari M (2015) Safety and feasibility of a KineSpring knee system for the treatment of osteoarthritis: a case series. Clin Med Insights Arthritis Musculoskelet Disord 8:47–54. https://doi.org/10.4137/CMAMD.S24423
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献