An Advanced Device for Multiplanar Instability Assessment in MRI

Andrade, Renato; Duarte, Hugo; Pereira, Ruth; Arias, Claudia; Bastos, Ricardo; Rodrigues-Gomes, Sérgio; Oliveira, Joaquim M.; Reis, Rui L.; Espregueira-Mendes, João

doi:10.1007/978-3-662-58245-9_3

Cited by 2 publications

(1 citation statement)

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“…The medical device was designed to measure the ankle laxity, that is, the multiplanar displacement after the application of an external mechanical force. The PATD emerges from a research and development line of medical devices to measure joint laxity (patent number: US10470700), including the Porto Knee Testing Device (PKTD ® ) 48 – 53 and the Porto Patella Testing Device (PPTD). 54 – 56 …”

Section: Design Specifications and Technical Requirementsmentioning

confidence: 99%

Development of a medical device compatible with MRI/CT to measure ankle joint laxity: the Porto Ankle Testing Device

Andrade

Pereira

Leal

et al. 2021

Porto Biomedical Journal

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Ankle sprains are common and often develop into chronic ankle instability. Ankle laxity is usually assessed by manual testing followed by magnetic resonance imaging to confirm the diagnosis. Manual testing however provides a subjective measure and is limited to the assessor sensibility. Current available technologies incorporate arthrometers to objectively measuring ankle laxity, but are not capable to assess the structural integrity of the capsuloligamentous structures. To overcome these limitations, we developed a novel medical device to assist in the diagnosis of ankle ligament injuries—the Porto Ankle Testing Device. With this device, it is possible to combine and correlate the assessment of the capsuloligamentous’ structural integrity with the joint functional competence (ie, joint multiplanar laxity). The main purpose of this work is to present the fundamental aspects and step-by-step development of the Porto Ankle Testing Device. We discuss the design specifications and technical requirements with the purpose to design and develop this medical device, described the features of the different components and explained the mechanical systems that are incorporated emulate manual testing and to measure the multiplanar ankle laxity. The preliminary findings are presented with the purpose to display the assessment protocol, the method of laxity measurement and the obtained results. We propose a unique and reliable medical device to safety and effectively assess ankle ligament injuries and contribute to enhance diagnosis, refine treatment indications and allow objective measurement of ligament laxity before and/or after stabilization surgery.

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