Evaluation of meniscal extrusion with posterior root disruption and repair using ultrasound

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• 作者：Grant Rowland¹ ; ^{growland@kumc.edu" class="auth_mail" title="E-mail the corresponding author} ; Damon Mar ^{dmar@kumc.edu" class="auth_mail" title="E-mail the corresponding author} ; Terence McIff ^{tmciff@kumc.edu" class="auth_mail" title="E-mail the corresponding author} ; Joshua Nelson ^{jnelson3@kumc.edu" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Meniscus ; Ultrasound ; Root tear ; Meniscus repair ; Extrusion
• 刊名：The Knee
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：23
• 期：4
• 页码：627-630
• 全文大小：527 K

文摘

Ultrasound techniques have been utilized for detection of discrete meniscus tears and extrusion. Meniscal extrusion is associated with increased contact pressure and decreased contact area contributing to the advancement of knee osteoarthritis. The purpose of this biomechanical study was to detect meniscal extrusion using a clinically available, portable ultrasound device. And further, to show that extent of injury and a weight-bearing state correlate with amount of extrusion.

Methods

A portable, hand-held ultrasound was utilized to image the lateral meniscus in association with (1) an intact posterior root attachment, (2) a 50% cut, (3) a 100% cut, and (4) repaired posterior root attachment. Images were obtained in an unloaded condition, and again under a static, physiologic (70 kg) axial load for above injury levels, and again following repair.

Results

Significant differences in extrusion were noted between the intact and both the 50% cut (p = 0.028) and 100% cut groups (p < 0.001) all in the loaded position. No significant difference was found in extrusion between intact state and repaired posterior root in the axially loaded position (p = 0.174). Both load (p = 0.003) and injury level (p = 0.005) had significant effects on the mean extrusion of the lateral meniscus.

Conclusion

Sectioning of the lateral meniscus posterior root will produce significantly increased lateral extrusion of the meniscus under physiologic loads. Unlike MRI evaluation, weight-bearing ultrasound images allow a functional assessment of meniscus extrusion. Trans-tibial posterior root repair can restore the lateral meniscus position and integrity.

Clinical relevance

This weight-bearing ultrasound technique can be an important assessment tool for complete evaluation of meniscus injuries.