| Muscle Weakening and Change of Tension According to Degree of Superior Rectus Z-Myotomy in Rabbits. |
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So Yoon Kim, Young Chun Lee |
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Department of Ophthalmology and Visual Science, Uijeongbu St. Mary's Hospital, The Catholic University of Korea College of Medicine, Uijeongbu, Korea. yclee@cmcnu.or.kr |
| 가토에서 상직근 Z-근연절단술 후 절단폭에 따른 근육약화 효과와 근장력의 변화 |
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김소윤⋅이영춘 |
Department of Ophthalmology and Visual Science, Uijeongbu St. Mary’s Hospital,
The Catholic University of Korea College of Medicine, Uijeongbu, Korea |
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| Abstract |
PURPOSE
To identify the muscle weakening effect and the change of muscle tension according to degree of superior rectus Z-myotomy in rabbits. METHODS: After dissection of superior rectus in 15 rabbits (30 eyes), marking was done on 10 mm apart from muscle insertion. Then, Z-myotomy was done on 2 mm and 8 mm apart from muscle insertion which are two different positions on apposite sides. 25%, 50% and 75% Z-myotomy were defined as group 1 (10 eyes), group 2 (10 eyes) and group 3 (10 eyes). After Z-myotomy, the change of muscle lengthening between muscle insertion and marking, and muscle tension were measured. At 4 weeks after Z-myotomy, all parameters were re-measured. RESULTS: After Z-myotomy all markings moved posteriorly, and showed result as 10.83 +/- 0.13 mm in group 1, 11.02 +/- 0.17 mm in group 2 and 12.01 +/- 0.23 mm in group 3 respectively. Muscle tension result showed as 3.98 +/- 0.22 mm in group 1, 3.54 +/- 0.18 mm in group 2 and 2.87 +/- 0.25 mm in group 3. In comparison of three groups, group 2 and group 3 showed the significant results (p < 0.05). At 4 weeks after Z-myotomy the markings showed result as 10.55 +/- 0.14 mm, 10.85 +/- 0.20 mm, 11.91 +/- 0.14 mm respectively, and in group 2 and group 3 the significant changes were seen (p < 0.05). Muscle tensions were 4.01 +/- 0.31 mm, 3.88 +/- 0.53 mm, 3.12 +/- 0.42 mm respectively. There were significant results in group 2 and group 3 (p < 0.05). CONCLUSIONS: 75% Z-myotomy of superior rectus showed significant results in muscle weakening and decreasing muscle tension. |
| Key Words:
Muscle weakening;Z-myotomy |
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