'PAR' in PAR 20 or PAR 50 is an acronym standing for Parabolic Aluminized Reflector. This name refers to the construction of the PAR bulb. The bulb traditionally features a tungsten filament surrounded by a reflector with an aluminum coating (hence aluminized). The reflector intensifies the beam and makes it more efficient.
Toe necrosis; Toe ischemia; Amputation; Dry gangrene Abstract Toe necrosis may have vast different etiologies. These include ischemia, embolus, and others. (1) The most common etiology is ischemia. It is a reduction in blood supply to a viable tissue that can lead to susceptibility to infection and tissue death. Peripheral ischemia, which is rooted in the
Avascular necrosis is characterized by a fracture and collapse of the metatarsal head. This causes the rounded end of the bone to flatten out, and leads to a reduction or loss of blood flow to the toe. It usually occurs in the second metatarsal (the toe next to the big toe), but it can occur in the third or even fourth toes as well.