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Open AccessArticle

Patellofemoral Joint Loads during Running Immediately Changed by Shoes with Different Minimalist Indices: A Cross-sectional Study

1
School of Kinesiology, Shanghai University of Sport, Shanghai 200438, China
2
Key Laboratory of Exercise and Health Sciences of Ministry of Education, Shanghai University of Sport, Shanghai 200438, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(19), 4176; https://doi.org/10.3390/app9194176
Received: 14 September 2019 / Revised: 29 September 2019 / Accepted: 2 October 2019 / Published: 6 October 2019
(This article belongs to the Special Issue Biomechanical Spectrum of Human Sport Performance)
Purpose: Given the high incidence of patellofemoral pain syndrome (PFPS) in runners, this study aimed to investigate the immediate effect of shoes with different minimalist indices (MI) on the mechanical loads of the patellofemoral joint. Methods: Fifteen healthy male rearfoot strike runners were recruited to complete overground running trials at 3.33 m/s (±5%) in two running shoe conditions (MI = 26% versus MI = 86%). The amount of ten Vicon infrared cameras (100 Hz) and two Kistler force plates (1000 Hz) were used to collect kinematic and ground reaction force (GRF) data simultaneously. Quadriceps strength, patellofemoral contact force, patellofemoral contact area, and patellofemoral contact stress were calculated. Results: No significant differences were observed in the impact force and the second peak of the vertical GRF between the two shoe conditions. Compared to wearing low-MI shoes, wearing high-MI shoes showed that the maximum flexion angle of the knee, the contact area of patellofemoral joint and the peak knee extension moment reduced significantly (p < 0.01), and the peak patellofemoral contact force and stress decreased significantly (p < 0.05). Conclusion: These findings suggest that wearing high-MI shoes significantly decreases the patellofemoral contact force and patellofemoral joint stress by reducing the moment of knee extension, thus effectively reducing the load of the patellofemoral joint during the stance phase of running and potentially lowering the risk of PFPS. View Full-Text
Keywords: minimalist index; patellofemoral contact force; patellofemoral contact stress; footwear; patellofemoral joint pain syndrome minimalist index; patellofemoral contact force; patellofemoral contact stress; footwear; patellofemoral joint pain syndrome
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Yang, C.; Xiao, S.; Yang, Y.; Zhang, X.; Wang, J.; Fu, W. Patellofemoral Joint Loads during Running Immediately Changed by Shoes with Different Minimalist Indices: A Cross-sectional Study. Appl. Sci. 2019, 9, 4176.

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