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Orbital decompression for thyroid eye disease: methods, outcomes, and complications

Abstract

Purpose

To determine the safety and effectiveness of orbital decompression for thyroid eye disease (TED) in our unit. To put this in the context of previously published literature.

Patients and methods

A retrospective case review of all patients undergoing orbital decompression for TED under the care of one orbital surgeon (SMS) between January 2009 and December 2015. A systematic literature review of orbital decompression for TED.

Results

Within the reviewed period, 93 orbits of 55 patients underwent decompression surgery for TED. There were 61 lateral (single) wall decompressions, 17 medial one-and-a-half wall, 11 two-and-a-half wall, 2 balanced two wall, and 2 orbital fat only decompressions. For the lateral (single) wall decompressions, mean reduction in exophthalmometry (95% confidence interval (CI) was 4.2 mm (3.7–4.8), for the medial one-and-a-half walls it was 2.9 mm (2.1–3.7), and for the two-and-a-half walls it was 7.6 mm (5.8–9.4). The most common complications were temporary postoperative numbness (29% of lateral decompressions, 17% of other bony decompressions, OR 0.50, 95% CI 0.12–2.11) and new postoperative diplopia (9% of lateral decompressions, 39% of other bony decompressions, OR 6.8, 95% CI 1. 5–30.9). Systematic literature searching showed reduction in exophthalmometry for lateral wall surgery of 3.6–4.8 mm, with new diplopia 0–38% and postoperative numbness 12–50%. For other bony decompressions, reduction in exophthalmometry was 2.5–8.0 mm with new diplopia 0–45% and postoperative numbness up to 52%.

Conclusion

Differing approaches to orbital decompression exist. If the correct type of surgery is chosen, then safe, adequate surgical outcomes can be achieved.

Introduction

Thyroid eye disease (TED) is a heterogeneous condition characterised by inflammation of the extraocular muscles and other orbital tissues. Surgical management of TED may include orbital decompression, defined as any surgical procedure to reduce intraorbital pressure and its effects by the means of enlargement of the bony orbit and/or removal of orbital fat.1 Indications for surgery include sight-threatening compressive optic neuropathy, raised intra-orbital pressure (hydraulic thyroid eye disease), exposure keratopathy, and improved cosmesis for people with stable, disfiguring exophthalmos. Various techniques for orbital decompression exist; they vary in the incision/approach used and in which part of the orbit is removed. For bony decompression, the medial wall, orbital floor, and lateral wall may be removed. Depending on the severity of exophthalmos, removal of orbital fat may also be considered.1, 2 A recent study from Sweden has shown the positive impact that orbital decompression surgery can have on quality-of-life outcomes.3

In 2011, a new technique was described by Geoffrey Rose for lateral (single) wall, rim sparing orbital decompression.4, 5 Results from a small case series on this technique showed it could achieve a moderate decompression effect (mean 4.8 mm) and had low complication rates.4

It has become our practice in Sheffield to use a modified version of the Rose technique for lateral orbital (single) wall decompressions in patients with moderate proptosis. In patients with severe proptosis, a two-and-a-half wall decompression is usually chosen (where the medial wall, medial half of the floor, and lateral wall are removed); and for patients with sight-threatening orbitopathy, a medial one-and-a-half wall approach (where the medial wall and medial half of the floor is removed) is used after a trial of three daily/alternate day injections of high-dose intravenous methylprednisolone. Orbital fat decompression alone is done in cases with mild proptosis.

We describe here our clinical practice, methods, and outcomes for orbital decompressions. We put this into the context of a systematic literature review of outcomes from surgical decompressions. Our hope is that this will help to define acceptable clinical standards and aid clinicians in decision making when considering orbital decompression for patients suffering from TED.

Materials and methods

As part of an evaluation of our orbital decompression service, we carried out a retrospective review of the case notes for all patients who underwent orbital decompression surgery for TED at the Royal Hallamshire Hospital in Sheffield between January 2009 and December 2015 under the care of a single orbital surgeon (SMS). Data were gathered using a standardised proforma. Statistical analysis was carried out using RStudio (Boston, MA, USA) and IBM SPSS Statistics (Version 22 Armonk, NY, USA).

Surgical techniques

We describe here our surgical techniques, videos of which are available as uploaded Supplementary Information.

Lateral (single) wall decompression surgery with a modified Rose technique

See Supplementary Movie 1 for a video of this procedure. Under general anaesthetic, 0.5% marcaine with adrenaline is infiltrated around a limited lateral canthotomy site (without detaching the superior or inferior crus of the lateral canthal tendon). Intravenous antibiotics are administered. A Colorado needle (monopolar diathermy) is used to dissect down to the lateral wall. The lateral wall is then completely exposed with the aid of Stevens tenotomy scissors and Desmarres’ retractors. The periosteum is incised along the length of the lateral wall with monopolar diathermy 10 mm behind the orbital rim. A periosteal flap is then elevated anteriorly from the outer aspect of the lateral wall, around the rim, and then along the inner aspect of the lateral wall by gentle dissection with a Freer elevator and malleable retractor. The exposed zygomaticotemporal and zygomaticofacial arteries are then cut with monopolar cautery. The deeper periosteum is further elevated inferiorly along the inferior orbital fissure, posteriorly up to the superior orbital fissure, and superiorly to expose the lacrimal gland fossa. This is done visualising the exposed area from the lateral orbital rim with a headlight at all times. The periosteum is also elevated posteriorly from the outer aspect of the lateral wall along with temporalis muscle, to which heavy diathermy is then applied.

Saw, hammer and chisel, and then bone rongeurs (Kerrison bone punches) are used to make a rim sparing lateral wall osteotomy (ab-externo) as developed by Mr Geoffrey Rose. The globe is protected throughout the surgery with the aid of appropriate sized malleable retractors. Modification of Rose technique includes further deeper decompression into the trigone and cortical part of the greater wing of sphenoid with the use of burrs: the round fluted soft touch burr (Stryker) is used to cautiously remove further posterolateral bone, whereas the round diamond burr (Stryker) is used to smooth the edges of the decompression and in areas where the exposure is presumed to be close to the underlying dura. The diamond tip burr can also be used without irrigation for haemostasis along with bone wax. The periosteum encasing the lateral orbital contents is then opened over the osteotomy site and lacrimal gland using the Colorado needle and then stripped off the underlying orbital fat and lacrimal gland. This allows prolapse of lateral orbital fat, lateral rectus, and lacrimal gland into the new opening that is encouraged by applying pressure on the eye through the lids. The orbital fat pads, bands, and septae are opened by blut dissection using Stevens scissors above and below lateral rectus, taking due care of the lacrimal artery and other vessels. Decompression effect can be further enhanced if needed with debulking of the inferolateral fat pad. The residual anterior leaf of the periosteum is redraped over the lateral orbital rim and anchored to the posterior leaf of the periosteum. A monovac drain is applied before closure of the limited lateral canthotomy opening. We infiltrate the lower lid with 0.5% marcaine with adrenaline for post op analgesia; this also has the benefit of inducing downward pressure on the globe, encouraging it to sit deeper in the orbit and prolapsing the desired orbital contents into the newly created lateral wall decompression site. A firm pressure dressing is applied for 12–24 h and the monovac drain removed once it is confirmed that there is no active drainage. Intravenous methylprednisolone (10 mg/kg) is administered on first postoperative day before discharge from hospital to reduce inflammation

An ab-interno approach where the deep lateral wall is burred internally, although not our preferred method in Sheffield, may have the advantage of reducing the surgical time. It was used in one patient in the current series because of her high general anaesthetic risk and the desire for a reduced operative time.

Medial one-and-a-half wall orbital decompression surgery

See Supplementary Movie 2 for a video of this procedure. Surgery is done under general anaesthetic with a throat pack and intravenous antibiotic is administered at the onset of surgery. A 2.0 silk suture is passed through the medial aspect of the upper and lower eyelids to open the eyelids and expose the caruncular area widely. Marcaine 0.5% with adrenaline is infiltrated into the medial part of the eyelids, vertically along the medial wall of the orbit and between the plica and caruncular area to create a plane of dissection. The Colorado needle is used to make a retrocaruncular incision above the plica semilunaris and extending into the superior and inferior fornix region. Closed Stevens scissors are used at an angle of 30–45° to reach the posterior lacrimal crest and then gently opened to achieve blunt dissection without opening the medial fat pad. Desmarre retractor and small malleable retractors are used to reach the medial orbital wall. The periosteum is opened horizontally behind the posterior lacrimal crest with the Colorado needle and reflected gently off the medial wall with a Freer elevator and increasing sizes of malleable retractors, taking care not to breach the periobita at this stage. The upper margin of the periosteal reflection is up to the anterior and posterior ethmoidal arteries, the deeper margin is to the optic canal, and the lower margin is extended onto the floor, lateral to the infraorbital nerve. Visualisation is from the retrocaruncular opening with the aid of a headlight. A mid and posterior ethmoidectomy is performed with Watson Wilkins forceps and Tilly forceps, aided by suction. The medial half of the orbital floor, medial to the infraorbital nerve, is removed extending as posteriorly as possible taking care to diathermy the vessel entering the infraorbital nerve. The mid and posterior part of the inferomedial strut is removed until the Triradiate point is exposed (the Mercedes sign as taught by Mr Rose—personal communication with SMS). The anterior part of the strut along with its neighbouring anterior ethmoid is not removed as we believe this residual bony area helps support the globe and its removal does not enhance the effect of the decompression.

The sphenoid cavity is then entered via the posterior ethmoid and any remaining posterior ethmoidal bone anterior to the optic canal is removed to complete the medial one-and-a-half wall decompression at the apex.

The periosteum is then opened and stripped in a posterior to anterior direction to prolapse the medial rectus and the superomedial and inferomedial orbital fat pads into the decompressed area. The orbital fat pads, bands, and septae are then opened by blunt dissection with Stevens scissors and pressure is applied on the globe to further facilitate prolapse of the orbital contents into the newly created decompression site. This allows pressure to be released off the optic nerve by reducing crowding at the orbital apex. The newly created space may also allow for inferomedial movement of the optic nerve itself, thus easing the pressure on it at the orbital apex. The retrocaruncular conjunctival incision site is then closed with interrupted 7.0/8.0 vicryl sutures and a pressure dressing applied and left in place for 12–24 h.

Other decompressions: two-and-a-half wall orbital decompression, balanced two wall surgery, and fat decompression

A two-and-a-half wall decompression includes performing the lateral wall decompression surgery along with a medial one-and-a-half wall decompression surgery. When a lateral wall decompression is done with medial wall decompression alone (without removing the medial half of the orbital floor) it is termed as a balanced decompression.

In fat decompression, the inferolateral fat pad is debulked (and superolateral fat pad if required). This is done via a transconjunctival incision made on the inner aspect of the lateral canthus over the lateral orbital rim and extended inferiorly and superiorly as required.

Systematic literature review

In order to put in context the results of this case series we also carried out a literature review. We carried out an initial search of MEDLINE as follows: ‘Decompression, Surgical’ [Major search term] AND ‘Graves Ophthalmopathy’ [MESH search term]. We restricted the search to a 10-year period (search performed in July 2017). Articles not written in English were excluded. Experts in the field were consulted. Reference lists of identified primary reports and review articles were searched. Abstracts were carefully reviewed and relevant papers then considered in detail. We included studies that looked at outcomes for surgical decompression in TED, including bony and/or fat decompressions and open and/or endoscopic approach. Studies were excluded if they did not include outcome data measured by Hertel exophthalmometry.

Results

During the audited period, a total of 57 patients underwent orbital decompression for presumed TED. Case notes were available for all patients. Two patients who had co-pathology identified at biopsy during surgery (MALTOMA and Ig4 disease) were excluded from the remaining analysis. The baseline characteristics for the included 55 patients are shown in Table 1.

Table 1 Characteristics of the 55 patients included in the study

Of the 55 patients, 28 (51%) had bilateral surgery, 10(18%) had sequential orbit surgery, and 17 (31%) had unilateral surgery. This gave a total of 93 operated orbits. Table 2 shows the type of surgery and indication for these 93 orbits.

Table 2 Type of surgery, and indication for the 93 operated orbits

The reduction in exophthalmometry readings and percentage decrease in this reduction for the three main types of bony surgery are shown in Table 3.

Table 3 Comparison of mean pre- and postoperative Hertel exophthalmometry readings using two-tailed paired t-tests and mean percentage decreases (absolute reduction in proptosis/preoperative exophthalmometry) according to type of surgery

A total of 78 (84%) eyes had a postoperative exophthalmometry reading of 21 mm, 82 (88%) had a reading of 22 mm, and 91 (98%) had 24 mm.

Final visual acuities were 6/6 or better for 59 (63%) eyes and 6/9 or better for 84 (90%) eyes. A total of 19 eyes of 10 patients had decompression surgery for dysthyroid optic neuropathy (DON). Of these 10 patients, 7 (70%) were current or recent ex-smokers. For the 10 patients with DON, diagnosis of DON was based on decreased vision (6/12 or less in worse eye, n=7), RAPD (n=9), decreased colour vision (n=8), and apical crowding on CT (n=10). Postoperatively, 8/19 (42%) eyes achieved vision of 6/6 or better and 14/19 (74%) eyes had vision of 6/9 or better. One patient who underwent bilateral surgery for DON had further deterioration in vision postoperatively in one eye (to HM); this patient had been reluctant for initial surgery and declined further surgery, steroid treatment, or radiotherapy; she recovered and maintained good vision in the fellow eye (6/9) following surgery.

One patient who had bilateral medial one-and-a-half wall decompressions for sight-threatening TED developed decreased vision, a right RAPD, and swollen disc 6 weeks later. He then went on to have intravenous methylprednisilone, immunosuppression with azathioprine, further bilateral lateral wall decompression, orbital radiotherapy, and thyroidectomy for the disease to burn out. No other patients in this series required further decompression surgery.

Preoperative diplopia was reported in 21 (38%) patients, and this was improved by decompression surgery in 6 patients, such that 15 (27%) patients still had diplopia postoperatively. There were an additional 10 (18%) patients with new diplopia following orbital decompression. Postoperative numbness in the zygomatico-temporal/zygomatico-facial territory was reported by 13 (24%) patients. This symptom was mild and temporary (<3 months) in all but one person who had ongoing symptomatic numbness. Table 4 shows the number of patients experiencing these common complications.

Table 4 Rates of the two most common complications and further procedures

There was one case of an acute sub-dural haemorrhage in the immediate postoperative period needing urgent neurosurgical intervention. This was following bilateral lateral wall decompressions using an ab-interno technique (the only case in the current series that used the ab-interno technique). The patient was a 65-year-old female who had been a heavy smoker with a history of chronic obstructive pulmonary disease, angina, and a previous pulmonary embolus. She was keen for decompression surgery despite clear counselling of the risks involved. The ab-interno approach was chosen in an attempt to reduce surgical time in light of her anaesthetic risk. Surgery was uneventful and on the left side the dura was exposed (though not breached). Following a turbulent extubation she had altered sensorium and was found to have a tense socket on the left side. Urgent imaging showed a left-sided orbital haemorrhage extending from a sub-dural haemorrhage to be the cause. We postulate that this occurred as a result of haemorrhage from a bridging vessel through an area of exposed dura at the decompression site. Following neurosurgical intervention she eventually made a good recovery with final visual acuities of 6/7.5 in each eye with 3 and 0.5 mm reduction in proptosis on right and left side, respectively.

One patient who had bilateral lateral wall decompressions developed an inferior corneal perforation secondary to corneal exposure 10 months postoperatively. This was secondary to a combination of a lagopthalmos (due to inferior lid retraction) and an absent Bells’ phenomenon (due to a tight, scarred inferior rectus) and occurred while the patient was waiting for inferior rectus recession surgery. The corneal perforation was managed successfully with corneal gluing and botox (to induce complete ptosis), and later a temporary tarsorrhaphy. The underlying lower eyelid retraction was later managed with a lower eyelid heightening and lateral tarsal strip procedure. Following this there was still some mild residual lagophthalmos that was managed with a gold weight.

One patient, who also had rheumatoid arthritis, developed a postoperative scleritis 2 weeks after bilateral lateral wall decompressions that was managed with high-dose oral steroids. Another two patients having lateral wall decompressions developed postoperative orbital inflammation and were both treated successfully with a tapering course of oral steroids.

Of the 55 patients, 18 (33%) went on to have squint surgery. Of the 10 patients with new diplopia following their decompression surgery, 5 (50%) required squint surgery. No patients with new diplopia following lateral decompression surgery required squint surgery (Table 4). Lid surgery was carried out in 13 (25%) patients following their decompression (see Table 4).

There were postoperative exophthalmometry data for 23 eyes following squint surgery. For these 23 eyes, the mean pre-squint surgery (post decompression) exophthalmometry reading was 20.3 mm (SD 2.08) and post-squint surgery it was 19.3 mm (SD 2.49). The difference between these means was 0.98 mm and this was significant with a 2 -tailed paired t-test (P=0.038, 95% confidence interval (CI) 0.06–1.90).

Results of literature review

A total of 113 abstracts were identified by our search, those that met the inclusion criteria and are included in Table 5.

Table 5 Results from literature search

Discussion

In this evaluation of our decompression service of patients under the care of one orbital surgeon in Sheffield, UK, we have shown our methods, outcomes, and complications for 91 orbital decompressions and put these in the context of a systematic literature review. As a general rule of thumb, lateral (single) wall decompression was preferred for hydraulic TED or disfiguring exophthalmos with moderate proptosis (3–7 mm). In cases with severe proptosis (>7 mm), two-and-a-half wall decompression was preferred (Table 2). We chose medial one-and-a-half wall decompression for dysthroid optic neuropathy (by removing the medial orbital wall and posterior floor, the optic nerve is immediately given space to move inferomedially).

With lateral (single) wall decompressions we saw a reduction in exophthalmometry readings of 4.3 mm and with two-and-a-half wall decompressions a mean reduction in exophthalmometry of 7.6 mm. The mean reduction in exophthalmometry was 2.7 mm with the medial one-and-a-half wall approach. Interestingly, for all types of decompression the mean post-operative exophthalmometry fell close to 20 mm (Table 3). It is important to note that these procedures are not inflexible and that they are tailored to the individual need: intraoperatively, bony removal can be stopped when sufficient decompression effect is noted (when the posterior part of the globe is positioned behind the lateral orbital rim or symmetry with the contralateral side is achieved). Caution therefore needs to be exercised when interpreting the values of reduction in exophthalmometry readings in ours and other series.

Common complications included postoperative numbness and postoperative diplopia. Lateral (single) wall decompressions had a higher rate of postoperative numbness when compared with other bony decompression types, although this was not statistically significant (Table 4). It is important that postoperative numbness is mentioned as a potential complication for patients undergoing other decompression types and not just lateral orbital decompression. New-onset diplopia was less common following lateral decompressions compared with other bony decompressions (significantly so this time—Table 4). Furthermore, for the small number (9%) of patients experiencing new-onset diplopia in the primary position following lateral wall decompression surgery, none went on to require squint surgery (Table 4). This generally mild and transient diplopia following lateral wall decompression was likely due to adjustment to the new globe position following surgery. In contrast, 5 of the 7 patients (71%) with new-onset diplopia following other bony decompression surgery went on to require squint surgery. Patients undergoing lateral wall decompressions need to be counselled about the risk of new diplopia, although in contrast to other decompressions, this is unlikely to require further intervention in terms of squint surgery. Serious complications were rare in our case series. However, one patient with severe medical comorbidities had a life-threatening complication (subdural haemorrhage) requiring urgent neurosurgical intervention. An ab-interno approach was used in this patient in an attempt to reduce the surgical time for a patient with considerable anaesthetic risk. However, the ab-interno approach is not our preferred method as, in our experience, it gives poorer access and visualisation of the decompression site when compared with the ab-externo modified Rose technique. In hindsight, this surgical decision could have been a contributory factor to the complications in this case. This case highlights that this is not a risk-free surgery and patient selection with a thorough discussion of the risks and benefits for patients electing non-sight-threatening decompression surgery is paramount.

It is important to remember that patients are at risk of activation of other inflammatory and autoimmune conditions following the insult of surgery (a case of scleritis and two other reactivations of orbital inflammation in this series). Intravenous methylprednisolone should be considered perioperatively to guard against this as well as close monitoring in the early postoperative period. Furthermore, surgery does not prevent the new development of dysthyroid orbitopathy or other sight-threatening complications such as exposure keratophathy and hence patients need to be counselled about this and followed up appropriately.

Dysthyroid optic neuropathy can be a rapidly progressive and blinding condition, but with adequate immunosuppression and surgery the visual outcomes can be excellent. A pertinent lesson from our series is the importance of patient trust, understanding, and cooperation. In the one patient where there was poor compliance with treatment, the final visual outcome was poor. It is also important to closely monitor and treat any continued clinically active thyroid eye disease postoperatively with immunosuppression/orbital radiotherapy as medial one-and-a-half wall decompression surgery will simply deal with the acute optic neuropathy episode.

We found that squint surgery following orbital decompression does not undo the decompression effect as we suspected it might (we had presumed that the recession surgery on rectus muscles may cause the globe to lux forward and thus undo the reduction in proptosis caused by decompression surgery). Instead, there was a significant reduction in exophthalmometry readings post squint surgery that is likely because of a tendency for the decompression effect to increase over time in spite of squint surgery.

This study is not without its limitations. It presents a retrospective case review of orbital decompressions from a service evaluation of patients under the care of a single surgeon. As such, the transferability of the data needs to be taken with care. It is for this reason that we have put our results within the context of the wider literature on the subject through systematic literature searching.

Our literature search showed a vast array of differing surgical approaches from around the world (Table 5). We limited our literature search to the past 10 years as techniques have evolved considerably in this time period such that older studies become increasingly less meaningful. Lateral wall decompression results were similar to ours in the current series with decompression effects of 3.6–4.8 mm, risk of new diplopia 0–38%, and risk of postoperative numbness up to 50%. We suspect that the widely differing reports of postoperative numbness are because of the variable reporting and questioning about this generally mild postoperative symptom. The other bony decompressions (endoscopic or external) had decompression effects between 1.9 and 8 mm with a general rule that with more walls removed there was a greater decompression effect. The risk of new diplopia ranged from 0 to 45% and new numbness from 0 to 50%. A Cochrane review of orbital decompressions found only one randomised control study comparing two types of surgery.6 This study from Mexico showed similar outcomes, but differing complication rates for the Walsh–Ogura transantral technique and the Kennedy endoscopic endonasal approach. Neither of these techniques is any longer employed in wide clinical practice. As such, the evidence base behind our decision making for decompressions in TED lies very much within expert opinion and the case series' detailed in Table 5. Assimilation of these case series here will hopefully guide decision making and direct future prospective studies.

In summary, surgical orbital decompressions are an established procedure for the management of certain patients with TED. Lateral decompressions are safe and effective for hydraulic TED and stable proptosis and have low complication rates. Where there is severe proptosis, two-and-a-half wall decompression may be more suitable, but the risk of new postoperative diplopia is higher. For dysthyroid optic neuropathy not responding to immunosuppression, medial one-and-a-half wall decompression is usually the surgery of choice and has good results in restoring visual function where there is good patient compliance and understanding.

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Jefferis, J., Jones, R., Currie, Z. et al. Orbital decompression for thyroid eye disease: methods, outcomes, and complications. Eye 32, 626–636 (2018). https://doi.org/10.1038/eye.2017.260

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