Inferior rectus rupture following blowout fracture

B Sloan, A A McNab
Australian and New Zealand Journal of Ophthalmology 1998, 26 (2): 171-3

BACKGROUND: Extra-ocular muscle rupture is uncommon, usually seen after penetrating trauma or surgery. It is a very rare cause of diplopia following blunt orbital trauma.

METHODS: A patient who presented with no inferior rectus function after blunt orbital trauma is described.

RESULTS: Computed tomography (CT) scans demonstrated a large orbital floor fracture and suggested that the inferior rectus muscle was ruptured. This was confirmed at operation. Despite anatomical repair, there was no postoperative improvement in ocular motility.

CONCLUSIONS: Traumatic rupture of the inferior rectus is rare. Forced duction and force generation testing and CT are important in diagnosing ocular motility defects following orbital trauma.

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