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| inferior_oblique_nasal_tranposition [2026/07/13 17:51] – [Inferior Oblique Anterior and Nasal Transposition] Scott Larson | inferior_oblique_nasal_tranposition [2026/07/13 17:52] (current) – Scott Larson |
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| The **inferior oblique anterior and nasal transposition (ANT)** is a strabismus procedure first described by **David R. Stager Sr.** and colleagues in their landmark 2003 publication in the //Journal of AAPOS//. [[https://pubmed.ncbi.nlm.nih.gov/12825055/|Stager et al., 2003]] The procedure involves detaching the inferior oblique (IO) muscle from its insertion and repositioning it both anteriorly and nasally relative to the inferior rectus (IR) muscle insertion, thereby converting the IO from an extorter and elevator into an **intorter and tonic depressor**. | The **inferior oblique anterior and nasal transposition (ANT)** is a strabismus procedure first described by **David R. Stager Sr.** and colleagues in their landmark 2003 publication in the //Journal of AAPOS//. [[https://pubmed.ncbi.nlm.nih.gov/12825055/|Stager et al., 2003]] The procedure involves detaching the inferior oblique (IO) muscle from its insertion and repositioning it both anteriorly and nasally relative to the inferior rectus (IR) muscle insertion, thereby converting the IO from an extorter and elevator into an **intorter and tonic depressor**. |
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| {{::nasal_transposition_io.png?direct|}} | |
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| ====Expected Effect==== | ====Expected Effect==== |
| ====Surgical Technique==== | ====Surgical Technique==== |
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| The IO muscle is disinserted and reattached at a new position typically **2 mm nasal and 2 mm posterior to the nasal border of the IR muscle insertion**. [[https://pubmed.ncbi.nlm.nih.gov/12825055/|Stager et al., 2003]] This placement is critical — by moving the IO's effective insertion nasal to the IR, the muscle's vector of action is fundamentally altered. The procedure differs from standard anterior transposition (ATIO), which places the IO at or near the temporal border of the IR insertion. Stager et al. recommended the use of **Mersilene (permanent) sutures** rather than absorbable suture materials to prevent postoperative retraction of muscle fibers. [[https://pubmed.ncbi.nlm.nih.gov/12825055/|Stager et al., 2003]] | The IO muscle is disinserted and reattached at a new position typically **2 mm nasal and 2 mm posterior to the nasal border of the IR muscle insertion**. [[https://pubmed.ncbi.nlm.nih.gov/12825055/|Stager et al., 2003]] This placement is critical — by moving the IO's effective insertion nasal to the IR, the muscle's vector of action is fundamentally altered. The procedure differs from standard anterior transposition (ATIO), which places the IO at or near the temporal border of the IR insertion. Stager et al. recommended the use of **Mersilene (permanent) sutures** rather than absorbable suture materials to prevent postoperative retraction of muscle fibers. |
| | {{::nasal_transposition_io.png?direct|}}\\ |
| | [[https://pubmed.ncbi.nlm.nih.gov/12825055/|Stager et al., 2003]] |
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| ====Indications==== | ====Indications==== |