Ophthalmic Consequences of Mid-Facial Trauma
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OPHTHALMIC CONSEQUENCES OF MID-FACIAL TRAUMA G. N. DUTTON/ 1. AL-QURAINY,2 L. F. A. STASSEN 3 D. M. TITTERINGTON,4 K. F. MOOSs s A. EL-ATTAR, Glasgow, Plymouth and Sunderland SUMMARY severity of ophthalmic pathology deemed to merit report Fractures of the mid-face are commonly accompanied by ing, Reports written by maxillofacial and plastic surgeons injury to the visual system. Three hundred and sixty give lower estimates than those written by three patients who had sustained mid-facial fractures ophthalmologists, were assessed prospectively for evidence of such injury. When eye injuries are severe, they can be easily identi The data have been used to devise a scoring system for the fied by any clinician, but a number of injuries (such as maxillofacial surgeon in order to help identify those angle recession and retinal tears) may potentially threaten patients at risk of eye injury. The scoring system has been visual function and are difficult to detect by the non evaluated on a further cohort of 100 patients with a ophthalmologist. It is important to be able to identify such similar spectrum of injury and the sensitivity and speci patients so that correct referral can be made for appro ficity of the system have been determined. The results of priate treatment and with a view to thorough documenta these studies have been reported in the maxillofacial liter tion for potential medicolegal claims, ature. This paper reviews the data and results obtained. We have carried out a detailed prospective ophthalmic In summary, impaired visual acuity with a comminuted assessment on a cohort of 363 patients sustaining mid or out blow fracture , a motility abnormality, or facial facial fractures in order to determine the spectrum of oph fracture combined with head injury, sufficient to cause thalmic pathology which may arise and to identify those both retrograde and post-traumatic amnesia, emerged as individuals who would benefit from an ophthalmic opin major risk factors which are indicative of an adverse oph ionY These data have been used to devise a scoring thalmic outcome deemed to warrant referral. The scoring system whereby the maxillofacial surgeon can use his system which was developed from this data was found to observations (without recourse to detailed eye examin have a sensitivity of 94.4% and a specificityof89% for the ation) to identify those patients who may benefit from an detection of patients thought to merit ophthalmic assess ophthalmic opinion,9 The system has subsequently been 0 ment. Failure to assess central visual function as objec evaluated on a separate cohort of 100 similar patients, 1 tively as practicable in patients who have sustained PATIENTS AND METHODS mid-facial fractures may lead to potentially treatable ophthalmic pathology not being identified. Patients Three hundred and sixty three patients who had sustained Mid facial trauma sufficient to give rise to a facial bone mid-facial or frontal bone fractures and who were treated fracture may also injure the visual system. Estimates of at the Maxillofacial Unit, Canniesbum Hospital, Glasgow the incidence of ocular disorders following midfacial frac between April 1, 1985 and March 31, 1987 were admitted 1 ture vary considerably and range between 1 % and 57%? to the initial study, All patients with persistent pathology These estimates depend upon referral practice, whether were followed up for at least one year. Patients with cra the studies were prospective3,4 or retrospective2,5,6 and the niofacial fractures managed by the same team in the 'Tennent Institute of Ophthalmology, Western Infirmary, Glasgow regional neurosurgical unit were only included if they Gl16NT, were transferred to or followed up in Canniesbum 2Royal Eye Infirmary, Apsley Road, Plymouth PL4 6PL HospitaL 3Department of Oral and Maxillofacial Surgery, Sunderland District Patients with major trauma were evaluated ophthalmo General Hospital, Kayll Road, Sunderland, Tyne & Wear SR4 7TP, 4Department of Statistics, University of Glasgow, Glasgow G 12 logically within 48 hours of injury, whilst those with less 8QQ, severe injuries were assessed at the ensuing weekly oph 5Department of Oral and Maxillofacial Surgery, Canniesburn thalmic clinic. At a later stage (between December 1989 Hospital, Bearsden, Glasgow G6l lQL Correspondence to: Dr. G, N, Dutton, FRCS, FCOphth, Tennent and August 1990), 100 additional patients with identical Institute of Ophthalmology, Western Infirmary, Glasgow GIl 6NT. entry criteria were evaluated in the same manner. Eye (1992) 6, 86-89 OPTHALMIC CONSEQUENCES OF MID-FACIAL TRAUMA 87 Clinical Assessment required, for example, retinal detachment and retro-bulbar All patients underwent prospective assessment of their haemorrhage.9 maxillofacial status and were subsequently assessed in Selection of Risk Factors detail by both an ophthalmologist and an orthoptist. All Each of the potential predictors was initially considered data concerningthe facial injuries, the ophthalmic compli separately with respect to each of the outcome categories. cations and the management were comprehensively docu For each of the two-way contingency tables obtained, the mented and coded for subsequent statistical analysis. Chi squared statistic was computed and those predictors which gave results at or near the 5% confidence level were Statistical Analysis noted. All data were coded and tabulated and most statistical analyses were carried out using the statistical package Construction of a Scoring System Minitab. The data obtained above were analysed by means of step wise linear regression analysis. This technique results in a Potential Predictors selection of the subset of predictors which extracts the Seven sets of data were chosen as potential predictors for meaningful predictive information contained by all the ophthalmic injury. These were selected on the basis that predictors. The resulting subset therefore provides a par they may all be routinely recorded by the maxillofacial simonious but efficient means of prediction. The coeffi surgeon and may have a bearing on the ultimate ophthal cients of the corresponding regression equation were mic outcome. They comprised: employed to derive the scores suitable for everyday 1. Basic patient data: sex, age and month of injury practice. 2. Cause of injury RESULTS 3. Type of bone and associated soft tissue injury 4. Method(s) of surgical treatment Details of Injuries Sustained 5. Ophthalmic data: Affected eye. Visual acuity Figure I illustrates the spectrum of mid-facial fractures 6. Ocular motility data: Symptoms of double vision or sustained in the population studied and Figure 2 indicates obvious signs of eye movement disorder the causes of the injuries sustained. The severity of eye 7. Associated conditions: Retrograde and post-traumatic injuries is illustrated in Figure 3. This was classified in a amnesia and cranial nerve palsies manner similar to the outcome criteria described by Holt and Hole in their extensive review of eye injuries sus Outcome Categories tained following facial fractures. Only 34 patients had no The types of potential ophthalmic injury were classified evidence of eye injury. Mild (reversible) disorders includ into three outcome categories.9 'Non-referral cases' com ing eyelid swelling and subconjunctival haemorrhage was prised such self-limiting disorders as bruising and swell seen in 230 patients (60%). Fifty seven patients had sus ing. 'Routine referral cases' included those patients with tained eye injuries sufficient to cause visual dysfunction traumatic pupillary changes, traumatic cataract and for a number of weeks including four cases of choroidal impaired accommodation. 'Early referral cases' were tears not involving the macula and 13 patients with mac those for whom urgent therapeutic intervention might be ular oedema. The types of severe ophthalmic injury seen in 42 patients were as follows: Types of Fracture CAUSES OF INJURY 120 Pure N � u _ Female m 96 b 100 CJ Male e n·363 80 0 Combinations I 60 45 45 45 P a t III i e Fort n t s Undisplaced Arch Fig.!. Pie diagram illustrating the range of fracture types Fig. 2. Histogram showing the types of injuries sustained in seen in the population studied. (Type IV malar fractures are the population studied. (RTA = Road traffic accident. Asslt = characterised by frontozygomatic distraction whilst Type 1lI Assault. Indst = Industrial accident). Patients injured whilst malar fractures are not.) under the influence of alcohol are illustrated separately. 88 G. N. DUTTON ET AL. Retrobulbar haemorrhage Development of the Scoring System (requiring surgical intervention) 4 Corneal laceration 1 Not surprisingly, impairment in visual acuity emerged as Hyphaema 5 the most sensitive, single predictor of eye injury. Angle recession 8 Comminuted fractures of the malar culminated in the Vitreous haemorrhage and/or retinal tears 9 Irreversible maculopathy 6 most severe eye and motility defects, no doubt as a sequel Optic nerve injury 9 to the loss of the protection normally afforded by the lat 42 eral orbital wall. Pure blow out fractures were commonly accompanied EYE INJURIES by motility defects warranting ophthalmic referral. N Abnormalities of eye movement can, in most cases, easily u 186 m be diagnosed by the maxillofacial surgeon primarily on b 200 Male e the basis of diplopia. Although this predictor 'overlaps' o Female with comminuted and blow out fractures, it emerged as a n·363 150 predictor which identified additional cases deemed to war 0 I rant referral. Head injuries of sufficient severity to result in mid P 100 a facial fractures accompanied by both retrograde and post - I 46-- i traumatic amnesia also affect the visual system in many e 50 n cases. This severe form of amnesia thus emerged as a sig t s nificant risk factor. Figure 5 illustrates these risk factors, 0 the scores apportioned, and their significance. The means NORMAL MILD MODERATE SEVERE whereby these values have been derived have been Ocular Disorder described previously.9 Fig. 3. Histogram showing the severity of the injuries The tests for validity for these scores (when applied to sustained.