Researcher(s)
- Heather King, Biomedical Engineering, University of Delaware
Faculty Mentor(s)
- Martha Hall, Health Sciences, University of Delaware
Abstract
Foot drop is the inability to perform dorsiflexion and thus causes the toes to drag during a typical walking pattern [1]. Ankle Foot Orthotic (AFO) devices can assist patients with this condition by supporting the foot at a fixed angle. However, patients report that their current AFOs are uncomfortable, bulky, difficult to use, and draw unwanted attention to their condition [2]. Patients also report wishing that their AFO was waterproof to be used in more environments, stating that they lost their independence when it came to entering the shower [2]. This project aimed to design an AFO that can be worn in both wet environments and during the day to increase patient independence while performing ADLs (Activities of Daily Living). The target patient population was younger patients with cerebral palsy who scored on levels I-III of the GMFM (Gross Motor Function Measure) assessment, meaning that the individual can either walk with minimal impairment or is able to bear weight with assistance [3]. The new AFO device was also designed to meet other metrics such as being safe for weight bearing, comfortable, able to be worn with or without shoes, easy to use, and aesthetically pleasing. A prototype of the new AFO was developed using Solidworks and Geomagic Freeform CAD software to create a 3D-printed footplate and strut. Polyester Velcro straps secured the strut and tightened the EVA (Ethylene-Vinyl Acetate) foam-enclosed slap bracelet calf cuff. Wear and material tests will be performed in the future to assess the AFO’s durability in all environments, as well as a Likert test to determine the comfortability and aesthetics of the device. An improved AFO design has the potential to enhance the user experience and increase daily independence for patients.
[1] Alam, Morshed, et al. “Mechanism and Design Analysis of Articulated Ankle Foot Orthoses for Drop-Foot.” The Scientific World Journal, vol. 2014, 2014, pp. 1-14.
[2] A. Neti, “Development of a Novel AFO Design Incorporating User Perspective and Medical Purpose,” Undergraduate Dissertation, University of Delaware, 2020.
[3] Harvey, Adrienne R. “The Gross Motor Function Measure (GMFM).” Journal of Physiotherapy, vol. 63, no. 3, 2017, pp. 187–187, https://doi.org/10.1016/j.jphys.2017.05.007.