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Traumatic rupture of the lateral rectus

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Sir,

We present a case of rupture of the lateral rectus that followed a violent assault. Rupture of the lateral rectus is an infrequently encountered injury in isolation from other ocular injuries. The surgical management of this case is described. The various treatment options and a review of current literature are discussed.

Case report

A 39-year-old patient presented to the eye casualty department complaining of double vision following an assault. He was attacked from behind in an attempt to gouge out his eyes. He had no significant medical or ophthalmic history.

On presentation his visual acuity was 6/6 OU. He had a marked right esotropia. There were bilateral lid ecchymoses and subconjunctival haemorrhages. There were bilateral conjunctival lacerations consistent with fingernail gouging. The right lateral rectus muscle was exposed, and the belly of the muscle was completely severed with the insertional end falling onto the lower lid margin (Figure 1). He had a complete loss of right abduction. His posterior segment examination was normal. Radiological investigations showed no orbital fractures.

Figure 1
figure1

Ruptured lateral rectus.

An examination under anaesthesia confirmed complete avulsion of the right lateral rectus. There was 15 mm of the distal muscle attached to the globe. This segment of the muscle was excised at its insertion. The proximal end of the lateral rectus was identified by tracing the intermuscular septum of the superior and inferior recti posteriorly. The capsule was opened and the dark bruised muscle was visualised, contrasting with the pale capsule. The proximal muscle was attached to the insertion on a ‘hangback’ adjustable 6/0 vicryl suture.

On the first postoperative day, the sutures were adjusted to give orthophoria in the primary position. He had a residual esophoria on right lateral gaze. At 2 weeks follow-up, he was symptom free. He had a minimal (<5Δ) esophoria for near and distance. His Hess chart was near normal. At 6 months follow-up, he remained asymptomatic but had a small esophoria (<5Δ) for near and distance.

Comment

Traumatic rupture of a rectus muscle is an infrequent injury. The medial rectus muscle is the most frequently traumatised extraocular muscle followed next by the inferior rectus muscle, the superior rectus muscle, and the lateral rectus muscle respectively.1 Rupture of the inferior rectus has been described as a sequelae of a blow-out fracture.2 Medial rectus laceration has occurred post-medial orbital fracture.3 When extraocular muscle injury has been previously described following trauma, it has usually been associated with extensive orbital and ocular damage. It is unusual that the muscle was damaged in isolation in our case.

A disinserted or severed muscle is a recognised complication of strabismus surgery. When exploring such a case, Parks advises that the eye should not be forced into the opposite field of action of the suspect muscle.4 This may result in the muscle slipping backwards through its penetration site in Tenon's capsule. He suggests that the eye be displaced against the opposite orbital wall and retroplaced into the orbit, retracting Tenon's capsule with a Desmarres lid retractor in order to visualise the lost muscle. We advise that the most effective approach to this problem is to suture the proximal end with 6-0 vicryl and resect the distal portion, cutting it away from the original insertion. The proximal end is then sutured to the original insertion using ‘hangback’ technique. The position is then adjusted the following day as if the procedure had been an elective resection.

This report presents the successful surgical management of a difficult ocular motility problem following trauma.

References

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    Paysse EA, Saunders RA, Coats DK . Surgical management of strabismus after rupture of the inferior rectus muscle. J AAPOS 2000; 4(3): 164–171.

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    Sloan B, McNab AA . Inferior rectus rupture following blowout fracture. Aust N Z J Ophthalmol 1998; 26(2): 171–173.

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    Burke MJ, Delforte M, DeRespinis P . Medial rectus laceration. JPOS 2001; 38: 98–102.

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    Parks M . Slipped, disinserted or severed, and lost muscles. In: Rosembaum A (ed). Clinical Strabismus Management. WB Saunders: Philadelphia PA, 1999, pp 529–538.

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Correspondence to L O'Toole.

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O'Toole, L., Long, V., Power, W. et al. Traumatic rupture of the lateral rectus. Eye 18, 221–222 (2004). https://doi.org/10.1038/sj.eye.6700592

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