A study was conducted to estimate the risk that an adult (age 15 or over) will develop a surgically significant intracranial haematoma after a head injury. Two simple features were used that can be recognised by clinicians with minimal training: a skull fracture and the conscious level. The risks were calculated from samples of 545 patients with haematomas, 2773 head injured patients in accident and emergency departments, and 2783 head injured patients in primary surgical wards. With radiological evidence of skull fracture and any impairment of consciousness (including disorientation) one patient in four in an accident and emergency department or primary surgical ward will develop a haematoma. With no skull fracture and preserved orientation the risk to a patient in an accident and emergency department is one in 6000.

The research examined the effects of alcohol and other variables on cognitive outcome after severe head injury. Alcohol consumption habitually and at the time of injury were strongly related, and both were related to age and educational level but not injury severity. Covariance analysis to remove the effects of age and education showed a reduction in the main effects, so that only alcohol consumption at injury was a significant predictor of memory, but not other cognitive areas late after injury. There were significant interactions between severity of injury (post-traumatic amnesia), and alcohol habitually or at time of injury, with increasing alcohol consumption increasing the size of the memory deficit. To have a short post-traumatic amnesia and have drunk heavily led to a worse memory score than that found in patients with a considerably longer post-traumatic amnesia who had drunk lightly or not at all.

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Criteria for transferring head injured patients to a regional neurosurgical unit were changed to enable a larger proportion of patients admitted to primary surgical wards to have a CT scan. The yearly number of transfers doubled, more intracranial haematomas were detected, and mortality from this complication was reduced.

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