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Author Notes:

Correspondence should be addressed to Amalie Erwood; amalie.erwood@emory.edu

The authors thank Mabry Johnson for her contributions in medical illustration.

The authors declare that there is no conflict of interest regarding the publication of this article.



  • Femur fracture
  • Motorcross
  • Athlete
  • Sports injury
  • traumatic injury
  • prophylactic knee brace
  • femoral shaft fracture

Femur Fracture Associated with Knee Brace Wear in the Motocross Athlete: A Report of Two Cases and Review of the Literature.


Journal Title:

Case report in Orthopedic Research


Volume 2018


, Pages 1498541-1498541

Type of Work:

Article | Final Publisher PDF


The sport of motocross entails off-road motorcycle racing and is associated with a high incidence of traumatic injury. While prophylactic knee braces are routinely worn, there has been anecdotal concern that brace use is linked to femoral shaft fractures. While this risk remains unreported in the medical literature, preventing this complication has played a role in new commercial knee brace designs. We present two cases in which two motocross riders sustained transverse femoral shaft fractures at the proximal portion of each respective knee brace. The fracture locations measured on anterior-posterior radiograph were 22 and 21.1 cm proximal to the center of the knee, which is also the recommended proximal extent of motocross knee braces. We propose that the rigid knee brace protects the ligamentous knee structures but may focus undue force on the proximal aspect of the brace. New knee brace designs have incorporated features to dissipate the potentially injurious force to prevent femur fracture. While knee braces undoubtedly help prevent ligamentous knee injury, these cases question the safety of standard brace design and highlight the need for further brace development to better protect the patient's bony structures, in addition to the knee joint.

Copyright information:

© 2018 Amalie Erwood et al.

This is an Open Access work distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).
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