scholarly journals Anterior Transposition of Inferior Oblique Muscle for Treatment of Unilateral Superior Oblique Muscle Palsy with Inferior Oblique Muscle Overaction

2004 ◽  
Vol 45 (4) ◽  
pp. 609 ◽  
Author(s):  
Yoon Hee Chang ◽  
Kyoung Tak Ma ◽  
Jong Bok Lee ◽  
Sueng Han Han
Keyword(s):  
Oblique Muscle ◽  
Inferior Oblique Muscle ◽  
Anterior Transposition ◽  
Superior Oblique Muscle ◽  
Superior Oblique

Treatment of Inferior Oblique Muscle Overaction with Myectomy Or with Anterior Transposition

1996 ◽  
Vol 6 (1) ◽  
pp. 11-13 ◽  
Author(s):  
E. Chimonidou ◽  
K. Chatzistefanou ◽  
G. Theodossiadis
Keyword(s):  
Rectus Muscle ◽  
Oblique Muscle ◽  
Inferior Rectus ◽  
Inferior Oblique Muscle ◽  
Anterior Transposition ◽  
Chi Squared ◽  
Temporal Side ◽  
Superior Oblique Muscle ◽  
Inferior Rectus Muscle ◽  
Superior Oblique

This paper presents a comparative study of the effectiveness of myectomy and anterior transposition in the treatment of inferior oblique muscle overaction. We operated 160 patients with overaction of the inferior oblique muscle. Eighty patients (148 eyes) were operated by myectomy at the insertion and 80 patients (151 eyes) by anterior transposition of the insertion of the inferior oblique near the temporal side of the insertion of the inferior rectus muscle. Comparison of the two methods, using the chi-squared test, showed that: 1) both surgical procedures were equally effective (χ2=0.26) for correcting overaction of the inferior oblique muscle and V-phenomenon; 2) weakening of the inferior oblique muscle of both eyes was almost always required (in 115 out of 116 cases) in cases with V-phenomenon and often (24 out of 44 cases) in cases of congenital paresis of the superior oblique muscle. We conclude that both procedures are equally effective and equally easy to perform.

Trochlear unit activity during ocular convergence

1991 ◽  
Vol 65 (6) ◽  
pp. 1484-1491 ◽  
Author(s):  
L. E. Mays ◽  
Y. Zhang ◽  
M. H. Thorstad ◽  
P. D. Gamlin
Keyword(s):  
Unit Activity ◽  
Sensory Function ◽  
Oblique Muscle ◽  
Inferior Oblique Muscle ◽  
Lateral Translation ◽  
Muscle Innervation ◽  
Trochlear Nucleus ◽  
Ocular Convergence ◽  
Superior Oblique Muscle ◽  
Superior Oblique

1. Ocular convergence is usually accompanied by excyclotorsion of the eyes. Furthermore, the magnitude of cyclotorsion is dependent on the elevation of the eyes. The reason for this excyclotorsion during convergence is not understood. 2. Excyclotorsion could be produced by either increased activity in the inferior oblique muscle or decreased activity in the superior oblique muscle. An earlier study indicated that convergence may also be accompanied by a temporal (lateral) translation of the eye. This observation is more consistent with a relaxation of the superior oblique than contraction of the inferior oblique. 3. This hypothesis was tested by recording the activity of 31 neurons in the trochlear nucleus, which contains the superior oblique motoneurons. This was done in alert monkeys that were trained to make both versional and vergence eye movements. In addition, the cyclotorsion associated with convergence was measured in one of these monkeys. 4. A consistent excyclotorsion associated with convergence was observed. Trochlear unit activity decreased during convergence in all cells tested. The magnitude of this decrease was significantly greater than that seen with conjugate adduction. Furthermore, the size of the decrease varied systematically with ocular elevation in a manner that was consistent with earlier measures of cyclotorsion during convergence. 5. These results suggest that the excyclotorsion seen during convergence, and perhaps the lateral translation of the eye, are due to a relaxation of the superior oblique muscle. This relaxation during convergence is greater than that which accompanies similar conjugate movements of the eyes. We hypothesize that this peculiar pattern of muscle innervation has a motor rather than sensory function.(ABSTRACT TRUNCATED AT 250 WORDS)

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