Onychauxis is a dermatological and podiatric condition characterized by the abnormal, uniform thickening of the nail plate without the severe curvature or distortion seen in other hypertrophic nail disorders. While it can affect finger nails, it predominantly involves the toenails—most frequently the hallux (great toe). Though often dismissed as a benign cosmetic nuisance associated with…
Onychorrhexis
Onychorrhexis refers to the presence of longitudinal ridges or grooves along the nail plate, often accompanied by split, brittle, or fraying edges. Derived from the Greek words onyx (nail) and rrhexis (bursting or splitting), the condition affects the structural integrity of the keratinized plate. While onychorrhexis frequently occurs on fingernails, its presentation on toenails presents…
Onychophosis
Onychophosis is a common yet frequently underdiagnosed hyperkeratotic lesion that develops within the nail folds (sulci) or beneath the nail plate (subungual area) of the toes. Characterized by an excessive accumulation of horny, calloused skin cells, it occurs primarily as a protective physiological response to localized micro-trauma, friction, and abnormal mechanical pressure. While it can…
Overpronation of the foot in runners
Overpronation—the excessive inward rolling of the foot during the stance phase of gait—is one of the most widely discussed yet frequently misunderstood phenomena in running biomechanics. For decades, the running industry treated pronation as an absolute defect to be corrected with rigid motion-control shoes and prescription orthotics. Modern sports medicine and biomechanical research, however, offer…
The os tibiale externum
An os tibiale externum—commonly referred to as an accessory navicular, prehallux, or os naviculare secundarium—is one of the most frequent congenital accessory ossicles found in the human skeleton. Occurring in roughly 4% to 21% of the population, this extra osseous center arises along the medial border of the midfoot, situated adjacent to the tarsal navicular…
Treatment of onychomycosis
Onychomycosis—a fungal infection of the nail plate, nail bed, or surrounding tissue—is one of the most persistent and challenging dermatological conditions affecting the foot. Accounting for roughly half of all nail disorders, it affects up to 10% of the general population and up to 20% of adults over the age of 60. Beyond its aesthetic…
The Sole of Reconstruction: The Architectural and Cultural Legacy of Onitsuka Tiger
In the modern landscape of global footwear, sneakers are rarely just instruments of athletic utility. They function as cultural artifacts, canvases for artistic expression, and markers of subcultural identity. Yet few silhouettes bridge the divide between post-war industrial ingenuity, athletic performance, and contemporary fashion as seamlessly as Onitsuka Tiger. Founded in 1949 in Kobe, Japan,…
The Heavy Burden: How Obesity Affects Foot Health and Biomechanics
The human foot is an extraordinary piece of biological engineering. Composed of 26 bones, 33 joints, and over 100 muscles, tendons, and ligaments, it functions as both a stable platform and a dynamic shock absorber. Every time a person takes a step, the foot absorbs impact forces equivalent to two to three times their total…
Nighttime Awakening: The Physiology, Etiology, and Management of Nocturnal Leg Cramps
Few physical experiences are quite as jarring as being pulled from a deep sleep by a sudden, violent contraction in the calf or foot. Nocturnal leg cramps—often referred to clinically as nocturnal muscle cramps—are involuntary, intensely painful contractions of skeletal muscle that occur during periods of rest or sleep. Though frequently dismissed as a minor…
The Biomechanical Efficacy of Night Splints in the Management of Plantar Fasciitis
Plantar fasciitis is one of the most common causes of heel pain worldwide, accounting for roughly 10% of all running-related injuries and millions of clinical visits annually. Characterized by sharp, localized pain at the anteromedial aspect of the calcaneus, the condition stems from microtears and chronic degeneration of the plantar fascia—a thick, fibrous band of…