Inferior Oblique Belly Transposition for Small Angle Hypertropia With Inferior Oblique Overaction: A Pilot Study

Yang, Shumin; Guo, Xianguang; Tien, David Robbins

doi:10.3928/01913913-20170801-04

Cited by 16 publications

(14 citation statements)

References 6 publications

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“…This issue can be caused by marked fibrosis of the extraocular muscle in longstanding cases. Then, the entire body of the IO was sutured to the sclera anterior to the temporal insertion of the IR with IO tendon sparing 8 and the sclera was secured from immediately anterior to the IR insertion to the inferior periorbita. 9 Both procedures can strengthen the effect of treating the severe hypertropia of our patient.…”

Section: Discussionmentioning

confidence: 99%

Bilateral congenital hypertropic strabismus fixus: A case report

Zhou

Lü

2021

European Journal of Ophthalmology

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Purpose: To report an unusual and rare case of both eyes fixed in an extreme superomedial position. Case report: A case of 48-year-old woman presented with both eyes fixed in an extreme superomedial position; the microcorneas were covered almost completely by the upper eyelids even when she opened her eyes. A forced duction test was performed to confirm there were severe restrictions in all directions. She underwent disinsertion of the superior and medial rectus muscle, inferior oblique muscle belly transposition and sclera fixation. At the 1-year follow-up, there was improved ocular alignment. Conclusion: This case may be a special form of myopic strabismus fixus. The infratemporal fossa may be a bony landmark related to the etiology of global fixation.

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Section: Discussionmentioning

confidence: 99%

Bilateral congenital hypertropic strabismus fixus: A case report

Zhou

Lü

2021

European Journal of Ophthalmology

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“…[ 3 , 7 ] The IOMBT procedure was first implemented by Dr. Yang in treating IOOA with small-angle hypertropia (≤5 PD). [ 5 ] Despite the successful outcomes, potential bias may be a concern of this retrospective study, and more clinical data are necessary to support their conclusion due to its small sample size (ten cases).…”

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confidence: 96%

“…Therefore, it remains a clinical challenge to select the most appropriate type of surgery for the treatment of small-angle asymmetric SOP. Inferior oblique muscle belly transposition (IOMBT), [ 5 ] a new IO weakening procedure introduced to our practice lately, has shown positive results in treating small-angle asymmetric SOP as well as a lower risk of complications such as overcorrection and secondary A pattern. In this study, we evaluated the efficacy and safety of the IOMBT procedure for the treatment of small-angle asymmetric SOP.…”

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confidence: 99%

Efficacy analysis of inferior oblique muscle belly transposition for small-angle asymmetric superior oblique palsy

Zhang

Wang

et al. 2021

Chinese Medical Journal

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Asymmetric superior oblique palsy (SOP) is a complicated, non-comitant type of strabismus. Patients usually present with small-angle hypertropia in the affected eyes, accompanied by inferior oblique muscle overaction (IOOA). [1] Compensatory head posture and asymmetric development of the face are typically observed in congenital SOP, while diplopia is more common in an acquired SOP. [2] Prism glasses can improve diplopia and vertical deviation in the primary position, but they are not so successful at correcting non-comitant paralytic strabismus. In addition, vertical strabismus and compensatory head posture will return after the prism glasses are removed, wearing prism glasses will lower the vision of children prominently. Surgery like an inferior oblique muscle (IO) weakening procedure is often required eventually in those patients. However, conventional procedures for IO weakening may cause overcorrection and/or secondary A pattern in patients who have mild to moderate IOOA together with small-angle asymmetric SOP, posing a risk to its safety. [3] In the study by Caldeira, [4] 21% of the patients with mild to moderate IOOA developed A pattern following the surgery. Therefore, it remains a clinical challenge to select the most appropriate type of surgery for the treatment of small-angle asymmetric SOP. Inferior oblique muscle belly transposition (IOMBT), [5] a new IO weakening procedure introduced to our practice lately, has shown positive results in treating small-angle asymmetric SOP as well as a lower risk of complications such as overcorrection and secondary A pattern. In this study, we evaluated the efficacy and safety of the IOMBT procedure for the treatment of small-angle asymmetric SOP.

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“…Recessions [3][4] , myotomies [5][6] , and myectomies [7][8] are well-known as classic techniques of weakening the IO muscle. In 2018, Yang et al [9] reported a weakening procedure without disinsertion, the inferior oblique muscle belly transposition (IOMBT) for correcting IOOA with small-angle hypertropia successfully. The emergence of new technology provides a useful addition to traditional methods and shows certain advantages in reducing risks of complications [9] .…”

Section: Introductionmentioning

confidence: 99%

“…In 2018, Yang et al [9] reported a weakening procedure without disinsertion, the inferior oblique muscle belly transposition (IOMBT) for correcting IOOA with small-angle hypertropia successfully. The emergence of new technology provides a useful addition to traditional methods and shows certain advantages in reducing risks of complications [9] . At present, a few studies have reported this technique [10][11][12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of modified inferior oblique muscle belly transposition for V-pattern exotropia combined with mild to moderate inferior oblique muscle overaction

Hao¹,

Bian²,

Li³

et al. 2023

Int J Ophthalmol

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AIM: To investigate the effectiveness of a modified inferior oblique muscle belly transposition for treatment of V-pattern exotropia combined with mild to moderate inferior oblique muscle overaction. METHODS: Thirteen cases (23 affected eyes) of V-pattern exotropia with inferior oblique muscle overaction (+ or ++) who underwent the modified inferior oblique muscle belly transposition procedure were retrospectively reviewed. The amount of V-pattern, grade of inferior oblique overaction, degree of vertical strabismus, abnormal head posture, and the fovea-disc angle were evaluated before and after surgery. RESULTS: The V-pattern was corrected in all cases, and the amount of V-pattern reduced by 17.85±5.13 prism diopter (PD) on average (t=16.07, P<0.001). The surgical cure rate for mild to moderate inferior oblique muscle overaction was 87.0% (20/23). The degree of the fovea-disc angle has a mean reduction of 5.45°±2.87° (t=3.95, P=0.003) after surgery. The mean vertical deviation in 5 cases with a small-angle hypertropia (5.23±3.06 PD) in the primary position reduced by 3.15±1.86 PD (t=6.10, P<0.001). No serious complications were observed. CONCLUSION: The modified inferior oblique muscle belly transposition procedure can effectively treat mild to moderate inferior oblique overaction and relieve the V-pattern, which is safe and easy to perform.

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Inferior Oblique Belly Transposition for Small Angle Hypertropia With Inferior Oblique Overaction: A Pilot Study

Cited by 16 publications

References 6 publications

Bilateral congenital hypertropic strabismus fixus: A case report

Bilateral congenital hypertropic strabismus fixus: A case report

Efficacy analysis of inferior oblique muscle belly transposition for small-angle asymmetric superior oblique palsy

Effectiveness of modified inferior oblique muscle belly transposition for V-pattern exotropia combined with mild to moderate inferior oblique muscle overaction

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