Pulley tissues maintain the mechanical advantage of extraocular muscles under eye adduction: A simulation study
- VernacularTitle:滑车组织在眼球内旋运动时维持眼外肌力学优势的模拟研究
- Author:
Zhi-peng GAO
1
;
Wei-yi CHEN
1
Author Information
1. Institute of Applied Mechanics and Biomedical Engineering, Taiyuan University of Technology
- Publication Type:Journal Article
- Keywords:
Medial rectus muscle;
Pulley tissues;
Eye adduction;
Biomechanics
- From:
Journal of Medical Biomechanics
2014;29(6):E498-E503
- CountryChina
- Language:Chinese
-
Abstract:
Objective To study the biomechanical effect from pulley tissues of extraocular muscles on super adduction of the eye. Methods By the coordinate parameters of extraocular muscles reported in the literature and based on the mechanical equilibrium of eye movement, two mechanical models, active pulley model and non pulley model (as control), were established to simulate eye adduction in the range of 30°-45°. Results For the contribution of medial rectus muscle, the non pulley model produced more force than the active pulley model to control eye adduction, and its corresponding force value increasingly exceeded the physiologically safe threshold (0.5 N). At the maximum simulative adduction of 45°, the force of medial rectus obtained by active pulley model and non pulley model was 0.508 N and 0.782 N, respectively, and the latter was 56% greater than the safe threshold. For controlling eye adduction, the active pulley model consumed much less energy than the non pulley model. Conclusions Due to the existence of pulley tissues, extraocular muscles could control eye adduction by consuming less biological energy and reinforce the ocular derivation. In addition, with the active pulley, the medial rectus muscle could maintain its mechanical advantage under super adduction of the eye.
