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Foot Ankle Surg. 2019 Apr 28. pii: S1268-7731(18)30136-X. doi: 10.1016/j.fas.2019.04.011. [Epub ahead of print]

A simple foot pedal device in a horizontal bore imaging facility replicates weightbearing outcomes for Hallux Valgus patients.

Author information

1
Assiut University, Orthpaedic Department, Assiut, Egypt.
2
Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA, USA; Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, USA.
3
Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, USA.
4
Department of Radiology, Passavant Hospital, Pittsburgh PA, USA.
5
Orthopedic Partners, Pittsburgh PA, USA.
6
Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, USA; Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA; Orthopaedic Biomechanics Laboratory, Allegheny General Hospital, Pittsburgh, PA, USA. Electronic address: mcmllr@pitt.edu.

Abstract

BACKGROUND:

Weightbearing images are important to the diagnosis of foot pathologies as are the three dimensional views available from CT and MRI. Standard three-dimensional imaging hardware, however, does not have a simple tool to obtain weightbearing images. The current research aimed to design, build and test a simple device to apply load in a horizontal bore imaging facility.

METHODS:

With the immediate need in hallux valgus studies, hallux valgus subjects were imaged using the new loading device, which could be easily transported and had no additional electronics.

RESULTS:

Testing showed that the usual angular measures of the foot (intermetatarsal and hallux valgus) replicated the results from the standard of care standing plain film results. With application of load, HV angle changed from 29.9° non-weightbearing to 32.2° weightbearing, while IM angle changed from nonweightbearing 15.8° to weightbearing 16.5°.

CONCLUSION:

The pedal-like device can provide weightbearing images in a horizontal bore MRI facility.

KEYWORDS:

Simulated weightbearing; Weightbearing CT; Weightbearing device

PMID:
31079958
DOI:
10.1016/j.fas.2019.04.011

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