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Journal of the Korean Academy of Rehabilitation Medicine 2001;25(4):699-706.
Ultrasound and Pathologic Findings of Nodules in the Medial Hamstring Muscle of the Rabbit: Experimental Study for Myofascial Pain Syndrome.
Lee, Chang Hyung , Kang, Yoon Kyoo , Kim, Joo Hyun , Seo, Kwan Sik , Kim, Jung Ryul , Kim, Han Kyum
1Department of Rehabilitation Medicine, Korea University College of Medicine.
2Department of Anatomical Pathology, Korea University College of Medicine.
집토끼 내측 슬굴곡근 결절의 초음파와 조직학적 소견 근막통증후군에 대한 동물실험
이창형, 강윤규, 김주현, 서관식, 김정열1, 김한겸1
고려대학교 의과대학 재활의학교실, 1해부병리학교실
Abstract

Objective
To establish the objective method of diagnosing the myofascial pain syndrome through diagnostic ultrasound and pathology.


Method
Hamstring muscles of 7 female house rabbits, weighing 2.5∼3.0 Kg, were studied. The existence of nodule was confirmed by palpation and through diagnostic ultrasound. A horizontal length, vertical length, thickness, and an area of hyperechoic region were measured. Hyperechoic regions were biopsied and stained with hematoxylin-eosin.


Results
All examined rabbits had muscular nodules in the medial hamstring. Characteristic increase of echogenecity was observed in the medial hamstring muscles. Some uneven hyperechoic areas were seen in the lateral hamstring muscles. Fatty degeneration and giant round cells were observed in the medial hamstring where the echogenecity was increased. The giant round cells were observed only in the lateral hamstring.


Conclusion
Increased echogenecity of the medial hamstring muscle is probably contributed by muscles cells with fatty degeneration and giant round cells, and some portions of hyperechogenecity of lateral hamstring requires further study.

Key Words: Myofascial pain syndrome, Ultrasound, Pathology, Fatty degeneration
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