3%) and the inferior rectus
was the most commonly involved muscle (38.
A CT scan showed a 22 mm long foreign body in close relation with the inferior rectus
along the orbital floor causing an inflammatory reaction.
They performed right medial rectus muscle recession 18 months after the trauma, followed 10 months later by full-thickness tendon transposition of the superior and inferior rectus
muscles (with Foster suture).
6%) 1/2 (50%) 3/5 (60%) Inferior rectus
- 1/2 (50%) 1/5 (20%) Lateral rectus 1/3 (33.
Table 1: Extraocular examination of left eye Extraocular muscle Function Movement of left eye Medial rectus Adduction Absent Superior rectus Elevator in abduction Absent Inferior rectus
Depressor in abduction Absent Inferior oblique Elevator in adduction Absent Superior oblique Depressor in adduction Present but not full Lateral rectus Abduction Absent
Magnetic resonance imaging (MRI) of the orbit showed thickening of all left-sided extra-ocular muscles, predominantly left lateral rectus and inferior rectus
muscles with mild retro- orbital inflammatory changes and mild proptosis, consistent with orbital inflammatory pseudotumour (Figure-1).
If restriction to upgaze is demonstrated on the FDT, inferior rectus
muscle (IR) restriction is present.
Medial rectus, inferior rectus
and inferior oblique subnuclei
Mechanical entrapment of the orbital content most commonly the inferior rectus
muscle followed by the inferior oblique muscle causes diplopia in up gaze and down gaze and the forced duction test in this case is positive.
No evidence of any entrapment of the inferior rectus
muscle was seen.
Undercorrection with hypotropia, in one eye of another patient, required inferior rectus
Fortunately, in our patient there was no residual entrapment of the inferior rectus
muscle and this was confirmed by forced-duction test.