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Ottawa Ankle Rules Accurately Assess Injuries and Reduce Reliance on Radiographs

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Ottawa Ankle Rules Accurately Assess Injuries and Reduce Reliance on Radiographs AE_Nugent.1004.final 9/21/04 12:04 PM Page 785 Applied Evidence N EW R ESEARCH F INDINGS T HAT A RE C HANGING C LINICAL P RACTICE Ottawa Ankle Rules accurately assess injuries and reduce reliance on radiographs Paul J. Nugent, DO Bethesda Family Practice Residency Program, Cincinnati, Ohio Practice recommendations doing or not doing radiographs will enhance patient-physician communication. As we report in ■ If a patient does not exhibit any of the criteria this article, patients’ satisfaction with care seems of the Ottawa Ankle Rules, radiographs of the not to depend on whether x-ray films are ordered. foot or ankle are unnecessary (SOR: A). ■ APPLYING THE OTTAWA ■ Discuss the history, exam findings, and ANKLE RULES Ottawa Rules with patients. Evidence To address the problem of low positive predictive suggests that satisfaction with care does value of ankle radiographs, Stiell and colleagues4 at not depend on whether radiographs are the University of Ottawa and the Ontario Health ordered (SOR: B). Ministry developed a set of clinical parameters in the early 1990s to evaluate the need for ankle and n the United States, most ankle injuries are midfoot radiographs. Their criteria were based on a evaluated radiographically,1,2 even though only multivariable data analysis involving a large num- I about 15% are found to involve fractures.3 An ber of clinical variables associated with ankle estimated 6 million ankle radiographs are per- injuries. The resulting rules (Figure) have been formed annually in the US and Canada, costing shown to decrease the need for films by about 30%.4 approximately $300 million dollars (US). The If a patient does not exhibit any of the criteria, radi- Ottawa Ankle Rules can significantly decrease the ographs of the foot or ankle are not needed after number of unnecessary ankle radiographs. trauma (strength of recommendation [SOR]: A). The rules are not a substitute for sound clinical judgment, but augment findings in the history and Validation of the rules in different settings physical examination to help the clinician deter- A number of studies have tested the negative pre- mine the appropriateness of ankle films. If the dictive value of the Ottawa Ankle Rules. A high rules are met and radiographs are avoided, it is negative predictive value implies that if the rules unlikely, especially with good communication and are followed, a fracture will not be missed. Most follow-up, that a patient will turn out to have a of these studies were conducted in emergency significant fracture. Moreover, discussing physi- medicine, sports medicine, and orthopedic cal examination findings and the reasons for settings. In a follow-up study, Stiell and col- leagues found a sensitivity of 1.0 (95% confidence Correspondence: Dr. Paul J. Nugent, 4411 Montgomery Rd, interval, 0.95–1.0) for ankle fractures and mid- Suite 200, Cincinnati, Ohio 45212. E-mail: [email protected]. foot fractures. A positive result is a clinically OCTOBER 2004 / VOL 53, NO 10 · The Journal of Family Practice 785 AE_Nugent.1004.final 9/21/04 12:04 PM Page 786 OTTAWA ANKLE RULES ACCURATELY ASSESS INJURIES FIGURE Ottawa Ankle Rules for determining the need for radiographs Indications for ankle radiographs • Tenderness over the inferior or posterior pole of either malleolus, including the distal 6 cm • Inability to bear weight (4 steps taken independently, even if limping) at the time of injury and at the time of evaluation. Indications for midfoot radiographs • Tenderness along the base of the 5th metatarsal or navicular bone • Inability to bear weight (4 steps) at the time of injury and at the time of examination A modification developed by physicians at the University of Buffalo focuses on tenderness along the midline crest instead of fibular tenderness at the posterior and inferior malleolar edges. This modification (the Buffalo Rules) may obviate the need for radiographs in more than 50% of cases. Inferior or posterior pole of malleolus Navicular bone Base of 5th metatarsal EWELL ILLUSTRATION BY ROB FL significant fracture, described as one greater than Emergency medicine. The sensitivity in this 3 mm. Such avulsion type injuries are treated setting was also found to be 1.0, with a negative clinically like a sprain. In the Stiell study, all films predictive value of 1.0 when used by physicians. were evaluated by radiologists. The authors This means that no fractures would be missed by estimated a decrease in ankle radiographs by 28% using the rules. Specificity was only 0.19.3 In a if the rules were followed.4 multicenter Canadian trial, the results were 786 OCTOBER 2004 / VOL 53, NO 10 · The Journal of Family Practice AE_Nugent.1004.final 9/21/04 12:04 PM Page 787 OTTAWA ANKLE RULES ACCURATELY ASSESS INJURIES similar. Over 12,000 adults were evaluated with A study showed that patients who did the ankle rule at 8 teaching and community not get x-rayed were just as satisfied hospital emergency departments. This study with their care as those that did found a significant decrease in the number of ankle radiographs ordered without an increase in the rate of fractures missed.5 dence supported the rules as an instrument for Orthopedic surgery. In a study involving 153 clinically excluding fractures of the ankle and military cadets at West Point, orthopedic sur- midfoot. This analysis noted the sensitivity of 1.0 geons also showed the sensitivity of these rules found in virtually every study and estimated that was 1.0, with no false negatives. The investiga- the Ottawa Ankle Rules would decrease the need tors estimated they could safely forego 40% of all for films by 30% to 40%.10 ankle films and 79% of all midfoot films. In the 4 years of training at the Military Academy, an ■ THE OTTAWA ANKLE RULES estimated 33% of all cadets suffer an ankle AND CHILDREN sprain, which speaks to the prevalence of this The original Ottawa Ankle Rules were applied condition among young, active persons.6 strictly to adults, but they also have been stud- Sports medicine. A prospective study in a uni- ied considerably in the care of children. versity sports medicine clinic validated the use of Pediatric studies have documented sensitivities the ankle rules in a population of 94 athletes. The ranging from 97% to 100% and specificities investigators found a sensitivity of 1.0 for both from 24% to 47%. All studies have shown sig- ankle and midfoot injuries, and a reduction by 34% nificant decreases in unnecessary films and sig- in the number of films ordered.7 In that study the nificant cost savings. The conclusion of all authors comment on the value of these rules in the authors was that the Ottawa Ankle Rules are a sports medicine venue, where the rate of ankle and cost-effective, highly sensitive test for evaluat- midfoot fractures is low (less than 3%, as opposed ing acute ankle injuries in children.11–14 to up to 20% in the emergency setting).8 However, researchers at the University of Family medicine. Little research in family Colorado prospectively evaluated the use of medicine discusses office use of the Ottawa Ankle Ottawa Ankle Rules in children aged <18 Rules, but there is a need for a set of evidence- years. The previous studies had used the same based protocols in evaluating acute ankle injuries. criteria as used for adults, but because of the Before establishment of the ankle rules, family uncertainty of the long-term effects of Salter I physicians used the clinical findings of (1) (epiphyseal injury) or small (<3 mm) avulsion absence of tenderness on the dorsum of the foot, fractures in the pediatric population, those (2) lack of impaired weight bearing, (3) recent- injuries were included in the fracture category. ness of injury (more than 12 hours earlier), and This brought the sensitivity down to 83%, with (4) absence of additional injuries. Each of these a negative predictive value of 93%. The authors findings had a negative predictive value of least suggested that the Ottawa Rules not be 94%. While family physician researchers involved employed in the pediatric population.15 Clearly, in one study did not establish a set of decision more work needs to be done in order to clear “rules,” they estimated that using these criteria them for use in children. could reduce unnecessary films by about 30%.9 Meta-analysis. To synthesize results from a ■ USING THE RULES large number of studies of the Ottawa Ankle REDUCES COSTS Rules, a meta-analysis involving 27 studies Researchers analyzed the cost effectiveness of the including over 15,000 patients found that evi- rules in the US.16 Variables used to estimate sav- OCTOBER 2004 / VOL 53, NO 10 · The Journal of Family Practice 787 AE_Nugent.1004.final 9/21/04 12:04 PM Page 788 OTTAWA ANKLE RULES ACCURATELY ASSESS INJURIES ings included waiting time and lost productivity lines, but 78% admitted that patient expecta- as well as the obvious medical and radiographic tions influenced their decision making. These costs. Previous studies have indicated at least a rules would likely be of great value where radi- 28% decrease in unneeded ankle films.4 By using ographic facilities are inconvenient or costly for this admittedly conservative reduction, it was patients. estimated that the savings would range from $18 to $90 million annually (depending on payer mix REFERENCES involved). Even the smaller amount represents a 1. Dunlop MG, Beattie TF, White GK, Raab GM, Doull RI. Guidelines for selective radiologic assessment of inver- significant cost savings. sion ankle injuries. BMJ (Clin Res Ed) 1986; 293:603–605. ■ 2. Vargish T, Clarke WR. The ankle injury: indication for RULE MODIFICATIONS COULD selective use of X-rays.
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