Matt Cowley - Academia.edu (original) (raw)

Papers by Matt Cowley

Research paper thumbnail of Diabetic foot ulcer incidence in relation to plantar pressure magnitude and measurement location

Journal of Diabetes and its Complications, 2013

We prospectively examined the relationship between site-specific peak plantar pressure (PPP) and ... more We prospectively examined the relationship between site-specific peak plantar pressure (PPP) and ulcer risk. Researchers have previously reported associations between diabetic foot ulcer and elevated plantar foot pressure, but the effect of location-specific pressures has not been studied. Diabetic subjects (n=591) were enrolled from a single VA hospital. Five measurements of in-shoe plantar pressure were collected using F-Scan. Pressures were measured at 8 areas: heel, lateral midfoot, medial midfoot, first metatarsal, second through fourth metatarsal, fifth metatarsal, hallux, and other toes. The relationship between incident plantar foot ulcer and PPP or pressure-time integral (PTI) was assessed using Cox regression. During follow-up (2.4years), 47 subjects developed plantar ulcers (10 heel, 12 metatarsal, 19 hallux, 6 other). Overall mean PPP was higher for ulcer subjects (219 vs. 194kPa), but the relationship differed by site (the metatarsals with ulcers had higher pressure, while the opposite was true for the hallux and heel). A statistical analysis was not performed on the means, but hazard ratios from a Cox survival analysis were nonsignificant for PPP across all sites and when adjusted for location. However, when the metatarsals were considered separately, higher baseline PPP was significantly associated with greater ulcer risk; at other sites, this relationship was nonsignificant. Hazard ratios for all PTI data were nonsignificant. Location must be considered when assessing the relationship between PPP and plantar ulceration.

Research paper thumbnail of Foot ulcer risk and location in relation to prospective clinical assessment of foot shape and mobility among persons with diabetes

Diabetes Research and Clinical Practice, 2008

Research paper thumbnail of Characterization of Partial-Gravity Analog Environments for Extravehicular Activity Suit Testing

... Lauren Harvill 3 , Lena Desantis 3 , Richard M. Morency 4 , Jessica R. Vos 4 , Michael L. Ger... more ... Lauren Harvill 3 , Lena Desantis 3 , Richard M. Morency 4 , Jessica R. Vos 4 , Michael L. Gernhardt 4 1 Wyle Integrated Science & Engineering Group, Houston ... Lauren Harvill 3 , Lena Desantis 3 , Richard M. Morency 4 , Jessica R. Vos 4 , Michael L. Gernhardt 4 ...

Research paper thumbnail of A Robotic Cadaveric Flatfoot Simulation of Stance Phase

Research paper thumbnail of A Robotic Cadaveric Flatfoot Analysis of Stance Phase

Journal of Biomechanical Engineering, 2011

The symptomatic flatfoot deformity (pes planus with peri-talar subluxation) can be a debilitating... more The symptomatic flatfoot deformity (pes planus with peri-talar subluxation) can be a debilitating condition. Cadaveric flatfoot models have been employed to study the etiology of the deformity, as well as invasive and noninvasive surgical treatment strategies, by evaluating bone positions. Prior cadaveric flatfoot simulators, however, have not leveraged industrial robotic technologies, which provide several advantages as compared with the previously developed custom fabricated devices. Utilizing a robotic device allows the researcher to experimentally evaluate the flatfoot model at many static instants in the gait cycle, compared with most studies, which model only one to a maximum of three instances. Furthermore, the cadaveric tibia can be statically positioned with more degrees of freedom and with a greater accuracy, and then a custom device typically allows. We created a six degree of freedom robotic cadaveric simulator and used it with a flatfoot model to quantify static bone po...

Research paper thumbnail of Diabetic foot ulcer incidence in relation to plantar pressure magnitude and measurement location

Journal of Diabetes and its Complications, 2013

We prospectively examined the relationship between site-specific peak plantar pressure (PPP) and ... more We prospectively examined the relationship between site-specific peak plantar pressure (PPP) and ulcer risk. Researchers have previously reported associations between diabetic foot ulcer and elevated plantar foot pressure, but the effect of location-specific pressures has not been studied. Diabetic subjects (n=591) were enrolled from a single VA hospital. Five measurements of in-shoe plantar pressure were collected using F-Scan. Pressures were measured at 8 areas: heel, lateral midfoot, medial midfoot, first metatarsal, second through fourth metatarsal, fifth metatarsal, hallux, and other toes. The relationship between incident plantar foot ulcer and PPP or pressure-time integral (PTI) was assessed using Cox regression. During follow-up (2.4years), 47 subjects developed plantar ulcers (10 heel, 12 metatarsal, 19 hallux, 6 other). Overall mean PPP was higher for ulcer subjects (219 vs. 194kPa), but the relationship differed by site (the metatarsals with ulcers had higher pressure, while the opposite was true for the hallux and heel). A statistical analysis was not performed on the means, but hazard ratios from a Cox survival analysis were nonsignificant for PPP across all sites and when adjusted for location. However, when the metatarsals were considered separately, higher baseline PPP was significantly associated with greater ulcer risk; at other sites, this relationship was nonsignificant. Hazard ratios for all PTI data were nonsignificant. Location must be considered when assessing the relationship between PPP and plantar ulceration.

Research paper thumbnail of Foot ulcer risk and location in relation to prospective clinical assessment of foot shape and mobility among persons with diabetes

Diabetes Research and Clinical Practice, 2008

Research paper thumbnail of Characterization of Partial-Gravity Analog Environments for Extravehicular Activity Suit Testing

... Lauren Harvill 3 , Lena Desantis 3 , Richard M. Morency 4 , Jessica R. Vos 4 , Michael L. Ger... more ... Lauren Harvill 3 , Lena Desantis 3 , Richard M. Morency 4 , Jessica R. Vos 4 , Michael L. Gernhardt 4 1 Wyle Integrated Science & Engineering Group, Houston ... Lauren Harvill 3 , Lena Desantis 3 , Richard M. Morency 4 , Jessica R. Vos 4 , Michael L. Gernhardt 4 ...

Research paper thumbnail of A Robotic Cadaveric Flatfoot Simulation of Stance Phase

Research paper thumbnail of A Robotic Cadaveric Flatfoot Analysis of Stance Phase

Journal of Biomechanical Engineering, 2011

The symptomatic flatfoot deformity (pes planus with peri-talar subluxation) can be a debilitating... more The symptomatic flatfoot deformity (pes planus with peri-talar subluxation) can be a debilitating condition. Cadaveric flatfoot models have been employed to study the etiology of the deformity, as well as invasive and noninvasive surgical treatment strategies, by evaluating bone positions. Prior cadaveric flatfoot simulators, however, have not leveraged industrial robotic technologies, which provide several advantages as compared with the previously developed custom fabricated devices. Utilizing a robotic device allows the researcher to experimentally evaluate the flatfoot model at many static instants in the gait cycle, compared with most studies, which model only one to a maximum of three instances. Furthermore, the cadaveric tibia can be statically positioned with more degrees of freedom and with a greater accuracy, and then a custom device typically allows. We created a six degree of freedom robotic cadaveric simulator and used it with a flatfoot model to quantify static bone po...