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Head injuries are a common occurrence in organized sports and recreational activities, such as hockey, soccer, football, skiing, snowboarding, and cycling. Many sports, such as hockey and football, and recreational activities, such as bicycling, require helmets to prevent head injuries. Head injuries can range from minor contusions, lacerations, and superficial hematomas to more serious conditions including concussions, skull fractures, and intracranial hemorrhages.

Head injuries incurred by participation in sports and recreational activities are responsible for a significant number of visits to emergency departments and physicians’ offices each year. More than 10% of all visits to emergency departments are for head injuries, and 3% of all sports-related injuries presenting to emergency departments are head injuries. The majority of sports-related head injuries occur in people under 20 years of age.

Anatomy

The brain is enclosed in the bony skull (cranium). Between the cranium and the brain are three layers of meninges (mater). (1) The outer dura mater encloses the venous sinuses. (2) The arachnoid mater bridges the sulci on the cortical surface of the brain. (3) The pia mater is a delicate vascular membrane lining the cerebral cortex. There are also three potential meningeal spaces: (1) the epidural space between the cranium and the dura, (2) the subdural space between the dura and the arachnoid, and (3) the subarachnoid space between the arachnoid and the pia, containing cerebrospinal fluid.

The brain comprises the left and right cerebral hemispheres. The cerebral hemispheres are divided into lobes corresponding to the overlying cranial bones: frontal, parietal, occipital, and temporal. The cerebral cortex is made up of gyri (folds) and sulci (grooves). The cerebellum and brainstem, consisting of the medulla oblongata, pons, and midbrain, are located posterior and inferior to the cerebral hemispheres.

Evaluation of Injuries

Head injuries can potentially be very serious. Loss of consciousness may indicate a very serious head injury. An unconscious athlete may also have a neck injury and, therefore, should not be moved from the field until the neck has been appropriately immobilized by trained health care personnel. If the airway is compromised or there are signs of neurological deterioration, such as posturing or pupillary abnormalities, the athlete should be intubated and hyperventilated by trained personnel (e.g., a doctor or a paramedic). The athlete should be transported on a spinal board by ambulance to the nearest trauma center immediately (Table 1).

A conscious athlete with a head injury should be removed from the field of play and examined by medical personnel as soon as possible. The athlete should not be left alone and should be frequently reassessed for any signs of deterioration.

Details of Injury

The mechanism of injury may give an indication of the type of injury. Head injuries may result in loss of consciousness, amnesia, or vomiting. Additional symptoms may include headache, nausea, or difficulty concentrating. Athletes may seem dazed, irritable, or moody or may have difficulty answering questions.

Table 1 Indications for Immediate Transfer to Hospital of an Athlete with a Head Injury

None
Source: Reprinted from Hunte G. Sporting emergencies. In: Brukner P, Khan K, eds. Clinical Sports Medicine. 2nd ed. Roseville, New South Wales, Australia: McGraw-Hill; 2001:713–725. With permission from McGraw-Hill Australia.
Note: GCS = Glasgow Coma Scale.

The athlete's orientation, memory, and concentration may be affected. Orientation can be assessed by asking questions about the game, such as the opposing team, the score, and the position played. Memory can be evaluated by asking questions about events prior to the injury, such as when the last game was played, how the team got to the venue, or what the athlete did prior to the game. Immediate and delayed memory can be assessed by asking the athlete to recall a list of five words immediately and at the end of the assessment. Concentration and mental processing speed can be evaluated by asking the athlete to recite the months of the year backward or to do serial sevens. The athlete's ability to do the test may be affected by the injury, resulting in slow responses or mistakes.

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