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Hirohiko Kakizaki - One of the best experts on this subject based on the ideXlab platform.

  • location of the myoneural junction of the Inferior Oblique Muscle an anatomic study
    Annals of Anatomy-anatomischer Anzeiger, 2020
    Co-Authors: Marian Grace Anamagadia, Hirohiko Kakizaki, Hidetaka Miyazaki, Takashi Nakano, Ma Regina Paula Valencia, Munekazu Naito, Yasuhiro Takahashi
    Abstract:

    Abstract Purpose To examine both the horizontal and vertical locations of the myoneural junction of the Inferior Oblique Muscle (IOM) in reference to the ala nasi, IOM origin, and Inferior orbital rim. Materials and Methods Fifty-six orbits from 56 Japanese cadavers (15 male and 41 female cadavers; average age at time of death, 86.5 ± 9.4 years) were used in this experimental anatomical study. The inter-alae-nasi distance and the horizontal distances from the ipsilateral ala nasi to the IOM origin (ala-nasi-origin distance) and to the myoneural junction (ala-nasi-junction distance) were measured. The horizontal distance from the IOM origin to the myoneural junction (origin-junction distance) was calculated by subtraction of the ala-nasi-origin distance from the ala-nasi-junction distance. The vertical distance from the Inferior orbital rim to the myoneural junction (rim-junction distance) was also measured. Results The ala-nasi-junction, origin-junction, and rim-junction distances were 12.2 ± 3.2 mm, 10.6 ± 3.2 mm, and 3.4 ± 1.0 mm, respectively. Males had a longer inter-alae-nasi distance than females (P   0.050). The ala-nasi-junction distance tended to be negatively correlated with the inter-alae-nasi distance (r = −0.222, P = 0.050). Conclusions The ala-nasi-junction distance can be affected by the inter-alae-nasi distance, which was found to be longer in males. Therefore, the IOM origin and the Inferior orbital rim can be considered as more practical and reliable reference points to predict the location of the myoneural junction during the posterior Inferior orbitotomy, irrespective of sex.

  • damage to the Inferior Oblique Muscle branch of the oculomotor nerve a complication during orbital fat decompression
    International Ophthalmology, 2019
    Co-Authors: Yasuhiro Takahashi, Hirohiko Kakizaki
    Abstract:

    To present patients who suffered damage to the Inferior Oblique Muscle branch of the oculomotor nerve during orbital fat decompression. This study was a retrospective chart review of all patients who underwent orbital decompression surgery between April 2009 and June 2016 by the authors. Among 414 sides from 226 consecutive patients who underwent orbital decompression, the Inferior Oblique Muscle branch was injured in two sides (0.5%) of two patients. Both patients showed hypotropia and incyclotropia immediately after surgery. Within 6 months of injury, ocular deviation on primary gaze had mostly resolved after conservative treatment. None of the patients underwent strabismus surgery. Postoperative computed tomographic images demonstrated that the affected branch was indistinct 3–4 mm posterior to the Inferior Oblique Muscle. This report indicates that injury to the Inferior Oblique Muscle nerve branch can occur at a point posterior to the Inferior Oblique Muscle during orbital fat decompression; however, the resulting ocular deviation improves considerably within 6 months of injury.

  • normative measurements of Inferior Oblique Muscle thickness in japanese by magnetic resonance imaging using a new technique
    Graefes Archive for Clinical and Experimental Ophthalmology, 2018
    Co-Authors: Maria Suzanne Sabundayo, Hirohiko Kakizaki, Yasuhiro Takahashi
    Abstract:

    To measure the thickness of the Inferior Oblique Muscle (IOM) among Japanese by magnetic resonance imaging (MRI) using a new technique. This retrospective observational study included 78 patients (36 males and 42 females) who underwent MRI for detection of a unilateral orbital lesion or examining causes of unilateral retrobulbar pain. The thickness of the IOM was measured on the side without the orbital lesion or symptom. On the quasi-sagittal plane through the optic nerve, the major and minor axes of the cross-section of the IOM were measured. On the coronal plane, the maximum thickness perpendicular to the course of the IOM was measured. All measurements were performed using the digital caliper tool of the viewing software. The major and minor axes on the quasi-sagittal plane and the maximum IOM thickness on the coronal plane were 8.00 ± 1.83 mm, 2.98 ± 0.55 mm, 3.04 ± 0.55 mm respectively. There were no significant differences in IOM thickness measurements between sexes and sides (P > 0.050, Student’s t-test). No significant correlation with the major axis (r = 0.064, P = 0.576), minor axis (r = −0.065, P = 0.573) or the maximum thickness on the coronal plane (r = −0.099, P = 0.387) was found in relation to age (Pearson’s correlation coefficient). The normative IOM thickness in Japanese was presented on MRI, which were similar among all ages irrespective of sex and side. The new technique we used is easily applicable, and the results may serve as a guide to detect IOM involvement in inflammatory and neoplastic conditions of the orbit.

  • incarceration of the Inferior Oblique Muscle branch of the oculomotor nerve in patients with orbital floor trapdoor fracture
    Graefes Archive for Clinical and Experimental Ophthalmology, 2017
    Co-Authors: Yasuhiro Takahashi, Maria Suzanne Sabundayo, Hidetaka Miyazaki, Hidenori Mito, Hirohiko Kakizaki
    Abstract:

    Background Incarceration of the Inferior Oblique Muscle (IO) branch of the oculomotor nerve may occur in cases of orbital floor trapdoor fracture.

  • Inferior Oblique Muscle origin: horizontal location in relation to ala nasi and its gender difference.
    Annals of plastic surgery, 2013
    Co-Authors: Yasuhiro Takahashi, Hirohiko Kakizaki, Kiwamu Kohjima, Takashi Nakano, Ken Asamoto, Akihiro Ichinose, Masayoshi Iwaki
    Abstract:

    We studied the horizontal location of the Inferior Oblique Muscle (IOM) origin in relation to the ipsilateral ala nasi and compared the results between genders in 76 orbits of 38 Japanese cadavers. Consequently, the IOM origin was located 1.2 mm laterally to the vertical line through the lateral margin of the ipsilateral ala nasi. No significant difference was noted between genders (males, 1.3 mm; females, 0.9 mm; P = 0.257, Student t test) or between sides (right, 1.1 mm; left, 1.3 mm; P = 0.570, Student t test). In contrast, the mean interalae-nasi distance was 39.8 mm and was significantly greater in males than that in females (males, 40.8 mm; females, 38.6 mm; P = 0.049, Student t test). The ala nasi can be used as a reference point irrespective of gender or side for identifying the IOM origin during oculoplastic surgery.

Yasuhiro Takahashi - One of the best experts on this subject based on the ideXlab platform.

  • location of the myoneural junction of the Inferior Oblique Muscle an anatomic study
    Annals of Anatomy-anatomischer Anzeiger, 2020
    Co-Authors: Marian Grace Anamagadia, Hirohiko Kakizaki, Hidetaka Miyazaki, Takashi Nakano, Ma Regina Paula Valencia, Munekazu Naito, Yasuhiro Takahashi
    Abstract:

    Abstract Purpose To examine both the horizontal and vertical locations of the myoneural junction of the Inferior Oblique Muscle (IOM) in reference to the ala nasi, IOM origin, and Inferior orbital rim. Materials and Methods Fifty-six orbits from 56 Japanese cadavers (15 male and 41 female cadavers; average age at time of death, 86.5 ± 9.4 years) were used in this experimental anatomical study. The inter-alae-nasi distance and the horizontal distances from the ipsilateral ala nasi to the IOM origin (ala-nasi-origin distance) and to the myoneural junction (ala-nasi-junction distance) were measured. The horizontal distance from the IOM origin to the myoneural junction (origin-junction distance) was calculated by subtraction of the ala-nasi-origin distance from the ala-nasi-junction distance. The vertical distance from the Inferior orbital rim to the myoneural junction (rim-junction distance) was also measured. Results The ala-nasi-junction, origin-junction, and rim-junction distances were 12.2 ± 3.2 mm, 10.6 ± 3.2 mm, and 3.4 ± 1.0 mm, respectively. Males had a longer inter-alae-nasi distance than females (P   0.050). The ala-nasi-junction distance tended to be negatively correlated with the inter-alae-nasi distance (r = −0.222, P = 0.050). Conclusions The ala-nasi-junction distance can be affected by the inter-alae-nasi distance, which was found to be longer in males. Therefore, the IOM origin and the Inferior orbital rim can be considered as more practical and reliable reference points to predict the location of the myoneural junction during the posterior Inferior orbitotomy, irrespective of sex.

  • damage to the Inferior Oblique Muscle branch of the oculomotor nerve a complication during orbital fat decompression
    International Ophthalmology, 2019
    Co-Authors: Yasuhiro Takahashi, Hirohiko Kakizaki
    Abstract:

    To present patients who suffered damage to the Inferior Oblique Muscle branch of the oculomotor nerve during orbital fat decompression. This study was a retrospective chart review of all patients who underwent orbital decompression surgery between April 2009 and June 2016 by the authors. Among 414 sides from 226 consecutive patients who underwent orbital decompression, the Inferior Oblique Muscle branch was injured in two sides (0.5%) of two patients. Both patients showed hypotropia and incyclotropia immediately after surgery. Within 6 months of injury, ocular deviation on primary gaze had mostly resolved after conservative treatment. None of the patients underwent strabismus surgery. Postoperative computed tomographic images demonstrated that the affected branch was indistinct 3–4 mm posterior to the Inferior Oblique Muscle. This report indicates that injury to the Inferior Oblique Muscle nerve branch can occur at a point posterior to the Inferior Oblique Muscle during orbital fat decompression; however, the resulting ocular deviation improves considerably within 6 months of injury.

  • normative measurements of Inferior Oblique Muscle thickness in japanese by magnetic resonance imaging using a new technique
    Graefes Archive for Clinical and Experimental Ophthalmology, 2018
    Co-Authors: Maria Suzanne Sabundayo, Hirohiko Kakizaki, Yasuhiro Takahashi
    Abstract:

    To measure the thickness of the Inferior Oblique Muscle (IOM) among Japanese by magnetic resonance imaging (MRI) using a new technique. This retrospective observational study included 78 patients (36 males and 42 females) who underwent MRI for detection of a unilateral orbital lesion or examining causes of unilateral retrobulbar pain. The thickness of the IOM was measured on the side without the orbital lesion or symptom. On the quasi-sagittal plane through the optic nerve, the major and minor axes of the cross-section of the IOM were measured. On the coronal plane, the maximum thickness perpendicular to the course of the IOM was measured. All measurements were performed using the digital caliper tool of the viewing software. The major and minor axes on the quasi-sagittal plane and the maximum IOM thickness on the coronal plane were 8.00 ± 1.83 mm, 2.98 ± 0.55 mm, 3.04 ± 0.55 mm respectively. There were no significant differences in IOM thickness measurements between sexes and sides (P > 0.050, Student’s t-test). No significant correlation with the major axis (r = 0.064, P = 0.576), minor axis (r = −0.065, P = 0.573) or the maximum thickness on the coronal plane (r = −0.099, P = 0.387) was found in relation to age (Pearson’s correlation coefficient). The normative IOM thickness in Japanese was presented on MRI, which were similar among all ages irrespective of sex and side. The new technique we used is easily applicable, and the results may serve as a guide to detect IOM involvement in inflammatory and neoplastic conditions of the orbit.

  • incarceration of the Inferior Oblique Muscle branch of the oculomotor nerve in patients with orbital floor trapdoor fracture
    Graefes Archive for Clinical and Experimental Ophthalmology, 2017
    Co-Authors: Yasuhiro Takahashi, Maria Suzanne Sabundayo, Hidetaka Miyazaki, Hidenori Mito, Hirohiko Kakizaki
    Abstract:

    Background Incarceration of the Inferior Oblique Muscle (IO) branch of the oculomotor nerve may occur in cases of orbital floor trapdoor fracture.

  • Inferior Oblique Muscle origin: horizontal location in relation to ala nasi and its gender difference.
    Annals of plastic surgery, 2013
    Co-Authors: Yasuhiro Takahashi, Hirohiko Kakizaki, Kiwamu Kohjima, Takashi Nakano, Ken Asamoto, Akihiro Ichinose, Masayoshi Iwaki
    Abstract:

    We studied the horizontal location of the Inferior Oblique Muscle (IOM) origin in relation to the ipsilateral ala nasi and compared the results between genders in 76 orbits of 38 Japanese cadavers. Consequently, the IOM origin was located 1.2 mm laterally to the vertical line through the lateral margin of the ipsilateral ala nasi. No significant difference was noted between genders (males, 1.3 mm; females, 0.9 mm; P = 0.257, Student t test) or between sides (right, 1.1 mm; left, 1.3 mm; P = 0.570, Student t test). In contrast, the mean interalae-nasi distance was 39.8 mm and was significantly greater in males than that in females (males, 40.8 mm; females, 38.6 mm; P = 0.049, Student t test). The ala nasi can be used as a reference point irrespective of gender or side for identifying the IOM origin during oculoplastic surgery.

Maria Suzanne Sabundayo - One of the best experts on this subject based on the ideXlab platform.

  • normative measurements of Inferior Oblique Muscle thickness in japanese by magnetic resonance imaging using a new technique
    Graefes Archive for Clinical and Experimental Ophthalmology, 2018
    Co-Authors: Maria Suzanne Sabundayo, Hirohiko Kakizaki, Yasuhiro Takahashi
    Abstract:

    To measure the thickness of the Inferior Oblique Muscle (IOM) among Japanese by magnetic resonance imaging (MRI) using a new technique. This retrospective observational study included 78 patients (36 males and 42 females) who underwent MRI for detection of a unilateral orbital lesion or examining causes of unilateral retrobulbar pain. The thickness of the IOM was measured on the side without the orbital lesion or symptom. On the quasi-sagittal plane through the optic nerve, the major and minor axes of the cross-section of the IOM were measured. On the coronal plane, the maximum thickness perpendicular to the course of the IOM was measured. All measurements were performed using the digital caliper tool of the viewing software. The major and minor axes on the quasi-sagittal plane and the maximum IOM thickness on the coronal plane were 8.00 ± 1.83 mm, 2.98 ± 0.55 mm, 3.04 ± 0.55 mm respectively. There were no significant differences in IOM thickness measurements between sexes and sides (P > 0.050, Student’s t-test). No significant correlation with the major axis (r = 0.064, P = 0.576), minor axis (r = −0.065, P = 0.573) or the maximum thickness on the coronal plane (r = −0.099, P = 0.387) was found in relation to age (Pearson’s correlation coefficient). The normative IOM thickness in Japanese was presented on MRI, which were similar among all ages irrespective of sex and side. The new technique we used is easily applicable, and the results may serve as a guide to detect IOM involvement in inflammatory and neoplastic conditions of the orbit.

  • incarceration of the Inferior Oblique Muscle branch of the oculomotor nerve in patients with orbital floor trapdoor fracture
    Graefes Archive for Clinical and Experimental Ophthalmology, 2017
    Co-Authors: Yasuhiro Takahashi, Maria Suzanne Sabundayo, Hidetaka Miyazaki, Hidenori Mito, Hirohiko Kakizaki
    Abstract:

    Background Incarceration of the Inferior Oblique Muscle (IO) branch of the oculomotor nerve may occur in cases of orbital floor trapdoor fracture.

Pamela J Kutschke - One of the best experts on this subject based on the ideXlab platform.

  • anterior transposition of the Inferior Oblique Muscle for dissociated vertical deviation
    Ophthalmology, 1993
    Co-Authors: John P Burke, William E. Scott, Pamela J Kutschke
    Abstract:

    Background: Recently, anterior transposition of the Inferior Oblique Muscle was reported to be an effective treatment for dissociated vertical deviation (DVD), but data on long-term stability have not been reported. Methods: A retrospective, longitudinal analysis of 17 consecutive patients (22 eyes) with dissociated vertical deviation and Inferior Oblique overaction who had an anterior transposition of the Inferior Oblique for significant dissociated vertical deviation and a minimum of 12 months postoperative follow-up was undertaken. The size and degree of control of the dissociated vertical deviation and the degree of Inferior Oblique overaction were assessed preoperatively, and postoperatively at 1 week, at 4 to 6 months, and when last seen. The frequency of postoperative hypotropia and elevation deficits were noted. Results: The mean preoperative dissociated vertical deviation measured 13.4 ▵ , and the mean total vertical deviation measured 16.2 ▵ in primary position at 6 meters. The mean dissociated vertical deviation at last follow-up measured 6.7 ▵ , and the mean total vertical deviation was 7 ▵ . The dissociated vertical deviation remained controlled based on objective evaluation and subjective patient/relative response in 19 of 22 eyes after a mean follow-up of 2 years (range, 1 to 4.9 years). It recurred in one eye by 6 months postoperatively and in 3 eyes at the last examination. The Inferior Oblique overaction did not recur to a significant extent in any patient. The best results were achieved in eyes with preoperative dissociated vertical deviations less than 15 ▵ (0 of 11 failures). When the preoperative dissociated vertical deviation measured ▵ , 3 of 11 were failures. Postoperative primary position hypotropia was uncommon (1 of 17 patients), whereas 27% of eyes had mild postoperative elevation deficits in abduction and adduction. Conclusion: Anterior transposition of the Inferior Oblique is an effective treatment for dissociated vertical deviation with Inferior Oblique overaction but may be less stable in the long term when the preoperative dissociated vertical deviation is in excess of 15 ▵ .

Leonard Apt - One of the best experts on this subject based on the ideXlab platform.

  • the effect of anterior transposition of the Inferior Oblique Muscle on ocular torsion
    Journal of Aapos, 1997
    Co-Authors: Alvina Pauline Santiago, Leonard Apt, Sherwin J Isenberg, Y B Roh
    Abstract:

    Abstract Introduction: The effects of anterior transposition of the Inferior Oblique on elevation in adduction have been studied, but changes in objective ocular torsion have not been investigated. Methods: A prospective study on the effect of anterior transposition of the Inferior Oblique on objective torsion with use of fundus photography was undertaken in 24 eyes of 13 patients. The amount of ocular torsion was determined by measuring the angle formed by a horizontal line drawn across the geometric center of the disc and a second line connecting the geometric center to the foveola. Results: The decrease in excyclotorsion at 6 to 8 weeks after surgery was 6.9 ± 5.0 degrees (34%) ( p = 0.006) and 2.8 ± 4.4 degrees (13%) (not significant) after 10 weeks. An overall net change of 6.2 ± 4.8 degrees (33%) was obtained after anterior transposition of the Inferior Oblique adjacent or anterior to the Inferior rectus insertion ( p = 0.006). Transpositions done 1 to 3 mm behind the Inferior rectus insertion showed a negligible torsional change. Torsion where Inferior Oblique function normalized after anterior transposition of the Inferior Oblique (8.5 ± 2.9 degrees) was not different from control, whereas torsion where Inferior Oblique function recurred after surgery (15.9 ± 7.2) was significantly different from control ( p = 0.002). Regression analysis showed that only preoperative Inferior Oblique overaction and preoperative degree of torsion predicted the change in torsion after anterior transposition of the Inferior Oblique. Conclusion: Anterior transposition of the Inferior Oblique Muscle initially decreased objective excyclotorsion, but the effect decayed beyond 10 weeks. At least in the short term only anterior transposition of the Inferior Oblique Muscle done adjacent or anterior to the Inferior rectus insertion affected torsion.

  • the effect of anterior transposition of the Inferior Oblique Muscle
    American Journal of Ophthalmology, 1994
    Co-Authors: Anne J Ziffer, Sherwin J Isenberg, Richard L Elliott, Leonard Apt
    Abstract:

    The effect of anterior transposition of the insertion of the Inferior Oblique Muscle was compared with the results from conventional Inferior Oblique Muscle recession in 50 patients. Even though both groups of patients had a similar degree of overaction preoperatively, postoperative Inferior Oblique Muscle action was weaker (P