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The relevance of hearing a crack in ankle injuries
P M Reid1, A K Aggarwal, C Browning
1Department of Accident and Emergency Medicine, Addenbrooke's Hospital, Cambridge.
Objective:
To examine the predictive value of a crack noise or sensation in the history of injury in the diagnosis of ankle fracture.
Methods:
A short questionnaire was filled in on 464 patients with isolated ankle injuries attending the accident and emergency department in a three month period from July to September. These patients were seen in the usual way in the department and the need for x ray assessed according to clinical judgement and existing departmental guidelines. Cases which subsequently proved to be other than ankle injuries, for example, fractured calcaneus, were excluded from the study.
Results:
A positive history of hearing or feeling a crack did not indicate the need for an x ray or increase the possibility of a fracture; indeed the history of a crack made the presence of a fracture less likely. The clinical diagnosis of absence of fracture without radiological examination may require careful explanation to the patient.
Conclusions:
Hearing a crack in the ankle does not suggest a fracture.