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Head Injuries
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

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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- Conditioning and Training
- Aerobic Endurance
- Body Composition (Body Mass Index)
- Burnout in Sports
- Cardiovascular and Respiratory Anatomy and Physiology: Responses to Exercise
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- Diagnosis and Treatment of Sports Injuries
- Acupuncture
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- Dual-Energy X-Ray Absorptiometry (DEXA)
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- Pharmacology and Exercise
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- Diet and Nutrition
- Calcium in the Athlete's Diet
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- Postgame Meal
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- Injuries and Disorders
- Altitude Sickness
- Athlete's Heart Syndrome
- Bursitis
- Catastrophic Injuries
- Clavicle (Collarbone) Fracture
- Cold Injuries and Hypothermia
- Contusions (Bruises)
- Cramping
- Cyst, Ganglion
- Dehydration
- Epicondylitis
- Exertional Compartment Syndrome, Chronic
- Fractures
- Handlebar Palsy
- Headache, Exercise-Induced
- Hyponatremia, Exercise-Associated
- Lightning Injuries
- Muscle Cramps
- Organ Injuries
- Pectoralis Strain
- Referred Pain
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- Strains, Muscle
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- Intervertebral Disk Disease
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- Lower Back Muscle Strain and Ligament Sprain
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- Spinal Cord Injury
- Spondylolysis and Spondylolisthesis
- Cervical and Thoracic Spine
- Cervical and Thoracic Disk Disease
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- Cervical and Thoracic Spine Injuries
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- Forearm Fracture
- Little League Elbow
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- Olecranon Stress Injury
- Panner Disease
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- Foot
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- Black Nail
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- Sever Disease
- Turf Toe
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- Hand and Finger
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- Cervical Nerve Stretch Syndrome
- Concussion
- Craniofacial Injuries
- Dental Injuries
- Detached Retina
- Diffuse Axonal Injury
- Ear Infection, Outer (Otitis Externa)
- Ear Injuries
- Epidural Hematoma
- Eye Injuries
- Facial Injuries
- Head Injuries
- Intracerebral Hematoma
- Intracranial Hemorrhage
- Malignant Brain Edema Syndrome
- Neck and Upper Back Injuries
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- Skull Fracture
- Subarachnoid Hemorrhage
- Subdural Hematoma
- Torticollis, Acute
- Hip, Pelvis, and Groin
- Avascular Necrosis of the Femoral Head
- Avulsion Fractures
- Femoral Neck Stress Fracture
- Femoroacetabular Impingement
- Genitourinary Injuries
- Gluteal Strain
- Groin Pain
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- Anterior Cruciate Ligament Tear
- Articular and Meniscal Cartilage Regeneration and Repair
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- Shoulder Injuries, Surgery for
- Shoulder Instability
- Shoulder Subluxation
- Superior Labrum From Anterior to Posterior (SLAP) Lesions
- Skin
- Abrasions and Lacerations
- Allergic Contact Dermatitis
- Angioedema and Anaphylaxis
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- Dermatology in Sports
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- Frostbite and Frost Nip
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- Insect Bites and Stings
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- Sunburn
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- Urticaria and Pruritus
- Warts (Verrucae)
- Thigh
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- Wrist
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- Cholinergic Urticaria
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- Diabetes in the Young Athlete
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- Exercise and Heart Murmurs
- Exercise and Mitral Valve Prolapse
- Fever
- Functionally One-Eyed Athlete
- Gastrointestinal Problems
- Heat Illness
- Hepatitis
- Hypertension (High Blood Pressure)
- Infectious Diseases in Sports Medicine
- Ingrown Toenail
- Jet Lag
- Liver Conditions, Hepatitis, Hepatomegaly
- Marfan Syndrome
- Neurologic Disorders Affecting Sports Participation
- Obesity
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- Sickle Cell Disease
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- Skin Disorders Affecting Sports Participation
- Anatomical Abnormalities
- Infectious Diseases
- Blood-Borne Infections
- Ear Infection, Outer (Otitis Externa)
- Epstein-Barr Virus, Infectious Mononucleosis, and Splenomegaly
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- Hepatitis
- HIV and the Athlete
- Infectious Diseases in Sports Medicine
- Jock Itch
- Methicillin-Resistant Staphylococcus Aureus Infections
- Pulmonary and Cardiac Infections in Athletes
- Skin Conditions in Wrestlers
- Skin Infections, Bacterial
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- Skin Infestations, Parasitic
- Toenail Fungus
- Rehabilitation and Physical Therapy
- Special Populations
- Specialties and Occupations in Sports Medicine
- Athletic Trainers
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- Physiatry and Sports Medicine
- Physical and Occupational Therapist
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- Anger and Violence in Sports
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- Attention Focus in Sports
- Biofeedback
- Bulimia Nervosa
- Burnout in Sports
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- Hypnosis and Sport Performance
- Imagery and Visualization
- Leadership in Sports
- Mental Health Benefits of Sports and Exercise
- Motivation
- Overtraining
- Personality and Exercise
- Psychological Aspects of Injury and Rehabilitation
- Psychological Assessment in Sports
- Sport and Exercise Psychology
- Sports Socialization
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- Sports and Society
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- Anger and Violence in Sports
- Benefits of Exercise and Sports
- Diversity in Sports
- Doping and Performance Enhancement: A New Definition
- Doping and Performance Enhancement: Historical Overview
- Doping and Performance Enhancement: Olympic Games From 2004 to 2008
- Epidemiology of Sports Injuries
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- Protective Equipment in Sports
- Sports Injuries, Overuse
- Team and Group Dynamics in Sports
- Title IX, Education Amendments of 1972
- World Anti-Doping Agency
- Sports and Sports Medicine
- Air Pollution, Effects on Exercise and Sports
- Anatomy and Sports Medicine
- Benefits of Exercise and Sports
- Circadian Rhythms and Exercise
- Diversity in Sports
- Emergency Medicine and Sports
- Epidemiology of Sports Injuries
- Exercise and Disease Prevention
- Future Directions in Sports Medicine
- History of Sports Medicine
- Immune System, Exercise and
- Physical Examination and History
- Seasonal Rhythms and Exercise
- Shift Work and Exercise
- Skill Acquisition in Sports
- Sleep and Exercise
- Sleep Loss, Effects on Athletic Performance
- Sports Injuries, Surgery for
- Travel Medicine and the International Athlete
- Women's Health, Effects of Exercise on
- Organizations
- Issues for Practitioners
- Sports-Specific Injuries
- Aerobic Dance, Injuries in
- Archery, Injuries in
- Badminton, Injuries in
- Baseball, Injuries in
- Basketball, Injuries in
- Biking, Injuries in
- Boxing, Injuries in
- Cheerleading, Injuries in
- Cricket, Injuries in
- Dance Injuries and Dance Medicine
- Extreme Sports, Injuries in
- Field Hockey, Injuries in
- Figure Skating, Injuries in
- Football, Injuries in
- Golf, Injuries in
- Gymnastics, Injuries in
- Horse Riding, Injuries in
- Ice Hockey, Injuries in
- Karate, Injuries in
- Marathons, Injuries in
- Mixed Martial Arts, Injuries in
- Mountain Bike Racing, Injuries in
- Outdoor Athlete
- Racquetball and Squash, Injuries in
- Rowing, Injuries in
- Rugby Union, Injuries in
- Running Injuries
- Sailing and Yacht Racing, Injuries in
- SCUBA Diving, Injuries in
- Skiing, Injuries in
- Snowboarding, Injuries in
- Soccer, Injuries in
- Speed Skating, Injuries in
- Surfing, Injuries in
- Swimming, Injuries in
- Tennis and Racquet Sports, Injuries in
- Tennis Elbow
- Triathlons, Injuries in
- Ultimate Frisbee, Injuries in
- Volleyball, Injuries in
- Weight Lifting, Injuries in
- Windsurfing, Injuries in
- Wrestling, Injuries in
- Women and Sports
- Amenorrhea in Athletes
- Dysmenorrhea
- Eating Disorders
- Exercise During Pregnancy and Postpartum
- Female Athlete
- Female Athlete Triad
- Gender and Age Differences in Response to Training
- Menstrual Cycle and Sports Performance
- Menstrual Irregularities
- Osteoporosis Prevention Through Exercise
- Title IX, Education Amendments of 1972
- Transsexual Athletes
- Women's Health, Effects of Exercise on
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