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Mechanical fixation of a novel finger implant (APRICOT) for patients with early-stage osteoarthritis in the MCP joint of the thumb.

Boogert, J.L. (2021) Mechanical fixation of a novel finger implant (APRICOT) for patients with early-stage osteoarthritis in the MCP joint of the thumb.

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Embargo date:1 January 2032
Abstract:Problem definition: For patients with osteoarthrosis in the MCP joint of the thumb the current surgical treatment is joint fusion, which results in loss of joint functionality. As alternative, a novel finger implant was developed: the APRICOT. However, the success of this implant is dependent on its stable fixation in the joint. Design assignment: A mechanical fixation mechanism is therefore desired to prevent migration of the APRICOT with respect to the articulating surfaces of the MCP joint in the thumb. The APRICOT with its fixation mechanism is to be used in patients with osteoarthritic MCP joints of the thumb, with maximally 50% of the cartilage left in the joint. Final design: A medical product design approach was used for the design of the fixation mechanism. The final design cannot be described in detail, because a patent application is foreseen. During testing on an enlarged model of the MCP joint, the final design was the most successful in preventing migration of a prototype implant. A prototype of the final design can be made with 3D printing, which can be tested on a real scale joint model. Conclusion: To prevent migration of the implant in the joint, a fixation mechanism is required. Therefore, a mechanical fixation mechanism is proposed. The final design proved to prevent migration of a prototype implant in a short-term study. Before the design can be used in patients, rigorous testing of the implant and its behaviour in the joint is necessary. This will indicate if the proposed fixation mechanism can prevent the migration of the implant through its lifespan.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:44 medicine, 52 mechanical engineering
Programme:Biomedical Engineering MSc (66226)
Link to this item:https://purl.utwente.nl/essays/88958
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