Magnetic Resonance Imaging of the Globe-Tendon Interface for Extraocular Muscles: Is There an "Arc of Contact"?
Magnetic Resonance Imaging of the Globe-Tendon Interface for Extraocular Muscles: Is There an "Arc of Contact"?
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DOI：
10.1016/j.ajo.2018.07.002
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发表时间：
2018-10
影响因子：
4.2
通讯作者：
Demer JL
中科院分区：
文献类型：
--
作者：
Clark RA;Demer JL
To determine if the “arc of contact” is an accurate approximation of the globe-tendon interface for the biomechanical modeling of extraocular muscle (EOM) force transfer onto the globe. At a single academic institution, 18 normal and 14 strabismic subjects were prospectively recruited for surface-coil enhanced magnetic resonance imaging at 312- or 390-micron resolution in axial planes for horizontal EOMs (23 subjects, 26 orbits) and sagittal planes for vertical EOMs (13 subjects, 22 orbits) during large ipsiversive ductions. The measured angle at insertion and the predicted angle assuming an “arc of contact” were compared using paired t-tests. For normal EOMs, the measured angle at insertion was significantly greater than predicted assuming an “arc of contact” for the medial rectus (MR) (5.0° ± 4.8° versus 0.0° ± 0.0°, P=.03), lateral rectus (LR) (4.9° ± 3.0° versus 0.0° ± 0.0°, P=.02), inferior rectus (7.4° ± 4.8° versus 1.2° ± 2.6°, P=.00003), and superior rectus (0.6° ± 1.1° versus 0.0° ± 0.0°, P=.04). In strabismic subjects, the measured angle was significantly greater for the MR in abducens palsy (9.9° ± 4.3° versus 0.5° ± 0.7°, P=.0007) and after MR resection (9.0° ± 6.9° versus 1.2° ± 2.4°, P= .02), but not after LR recession (2.9° versus 0.0°). Single subjects had comparable angles after MR recession, but markedly different angles after MR and LR posterior fixation. Contrary to the “arc of contact” biomechanical model, normal and post-surgical EOMs are significantly non-tangent to the globe at their scleral insertions. The “arc of contact” should be replaced in biomechanical modeling by the experimentally measured angles at tendon insertions.
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影响因子：
2.5
作者：
Demer, Joseph L.;Clark, Robert A.
通讯作者：
Clark, Robert A.
影响因子：
2.5
作者：
Demer, JL;Clark, RA
通讯作者：
Clark, RA
影响因子：
4.2
作者：
Clark, RA;Ariyasu, R;Demer, JL
通讯作者：
Demer, JL
影响因子：
1.6
作者：
Clark, RA;Ariyasu, R;Demer, JL
通讯作者：
Demer, JL
影响因子：
1.6
作者：
Clark, Tiana Y.;Clark, Robert A.
通讯作者：
Clark, Robert A.