Semin Musculoskelet Radiol 2023; 27(03): 283-292
DOI: 10.1055/s-0043-1766098
Review Article

Bone Stress Injuries at the Ankle and Foot

1   Musculoskeletal Imaging, Department of Radiology, Kantonsspital Graubünden, Chur, Switzerland
2   Department of Diagnostic and Interventional Radiology, Medical Center–University of Freiburg, Freiburg, Germany
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1   Musculoskeletal Imaging, Department of Radiology, Kantonsspital Graubünden, Chur, Switzerland
› Author Affiliations
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Abstract

Bone stress injuries (BSIs) are a frequent finding in athletes, particularly of the foot and ankle. A BSI is caused by recurring microtrauma to the cortical or trabecular bone exceeding the repair capacity of normal bone. The most frequent fractures at the ankle are low risk, characterized by a low risk for nonunion. These include the posteromedial tibia, the calcaneus, and the metatarsal diaphysis. High-risk stress fractures have a higher risk for nonunion and need more aggressive treatment. Examples are the medial malleolus, navicular bone, and the base of the second and fifth metatarsal bone.

Imaging features depend on the primary involvement of cortical versus trabecular bone. Conventional radiographs may remain normal up to 2 to 3 weeks. For cortical bone, early signs of BSIs are a periosteal reaction or the “gray cortex sign,” followed by cortical thickening and fracture line depiction. In trabecular bone, a sclerotic dense line may be seen. Magnetic resonance imaging enables early detection of BSIs and can differentiate between a stress reaction and a fracture. We review typical anamnestic/clinical findings, epidemiology and risk factors, imaging characteristics, and findings at typical locations of BSIs at the foot and ankle that may help guide treatment strategy and patient recovery.



Publication History

Article published online:
25 May 2023

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