Auricular Hematomas
Auricular Hematomas Steven K. Poon, MD, CAQSM Kimberly G. Harmon, MD BASICS ALERT Failure to diagnose and promptly treat this condition with evacuation of the hematoma may lead to permanent…
Atlantoaxial Instability
Atlantoaxial Instability Rebecca L. Carl, MD, MSCI BASICS DESCRIPTION Atlantoaxial instability (AAI) is the term for increased motion at the joint between the 1st and 2nd cervical vertebrae (the atlas…
Athletic Heart Syndrome
Athletic Heart Syndrome Evan D. Perez, MD Daniel Murphy, MD, FAAFP Justin M. Wright, MD, CAQSM BASICS DESCRIPTION A benign condition consisting of physiologic adaptations to increased cardiac workload. Primary…
Anterior Metatarsalgia
Anterior Metatarsalgia Dominic Jacobelli, MD Kenneth Bielak, MD, FACSM, FAAFP, CAQSM BASICS DESCRIPTION Pain in the plantar aspect of the metatarsal (MT) heads Metatarsalgia can be thought of as a…
Ankylosing Spondylitis
Ankylosing Spondylitis Scott Chandler, DO Kevin deWeber, MD, FAAFP, FACSM, RMSK BASICS DESCRIPTION Ankylosing spondylitis (AS) is a chronic inflammatory, autoimmune arthritis characterized by inflammatory back pain (IBP). It is…
Anterior Interosseous Syndrome
Anterior Interosseous Syndrome Jarrod Yamanaka, MD BASICS The anterior interosseous nerve (AIN) is a motor branch of the median nerve that innervates the pronator quadratus, flexor pollicis longus, and flexor…
Ankle Sprains, Medial
Ankle Sprains, Medial Daniel C. Herman, MD, PhD, FAAPMR, FACSM, CAQSM Giorgio A. Negron, MD BASICS DESCRIPTION Injury to the deltoid ligament complex of the medial ankle occurs when the…
Ankle Sprains, Lateral
Ankle Sprains, Lateral Christopher A. Gee, MD, MPH, FACEP, CAQSM BASICS DESCRIPTION Lateral ankle sprains are the most common injury sustained by athletes (1) and comprise approximately 14% of all…
Ankle Impingement
Ankle Impingement Marcia Faustin, MD, CAQSM BASICS DESCRIPTION Impingement is a clinical syndrome of end-range joint pain or restricted motion caused by direct abutment and/or compression of bone or soft…
Anaphylaxis
Anaphylaxis Kristina Wilson, MD, MPH, FAAP, CAQSM BASICS The causative agent in anaphylaxis remains unknown in up to 1/3 of cases. Food is the most common causative agent (about 1/3…
