Abstract
Medial tibial stress syndrome (MTSS) is pain or discomfort in the leg from repetitive running on hard surfaces or forcible excessive use of foot flexors [1]. MTSS accounts for nearly 60% of all overuse injuries seen in the leg [1]. Excessive stress and cyclic loading over time can lead to MTSS. Studies have shown that accumulation of microdamage (linear microcracks or diffuse damage) due to fatigue loading may lead to bone fracture [2]. Early diagnosis is extremely critical for proper treatment and reduces complications. Other studies have also suggested that microdamage accumulation may have influence on bone's bulk properties [3]. Quantitative ultrasound (QUS) has been widely used to assess bone quality non-invasively, it is also radiation free, repeatable, safe, relatively accurate, and suitable for multiple skeleton sites. QUS can provide useful information in diagnosing MTSS and predicting fracture risk. Studies have shown that ultrasound correlates not only with the bone density but also with the bone stiffness [4]. The objective of this study is to evaluate the ability of QUS in early prediction of bone attenuation under repetitive loading. In this study, 8 ovine tibias were scanned by a scanning confocal acoustic diagnostic (SCAD) system to determine the mechanical property changes after cyclic loading.
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