Crabs are generally covered with a thick exoskeleton, composed primarily of highly mineralized chitin, and armed with a single pair of chelae (claws). Crabs are found in all of the world's oceans, while many crabs live in fresh water and on land, particularly in tropical regions. Crabs vary in size from the pea crab, a few millimetres wide, to the Japanese spider crab, with a leg span of up to 4 metres (13 ft). About 850 species of crab are freshwater, terrestrial or semi-terrestrial species; they are found throughout the world's tropical and semi-tropical regions.
Quick Answer. A pluot is a hybrid fruit created by cross-breeding a plum and an apricot. Pluots do not occur in nature and were first created in the late 20th century.
Home / Treatment Options / Posterior Lumbar Fusion (PLF) Posterior Lumbar Fusion (PLF) Overview and Indications. Posterior Lumbar Fusion (PLF) is the general term used to describe the technique of surgically mending two (or more) lumbar spine bones together along the sides of the bone. Bone graft is placed along side the spine bones (not in between the disc spaces, which is called an interbody fusion), and ultimately fuses together. PLF may be performed in conjunction with or without a posterior decompression (laminectomy) and/or instrumentation (use of metal screws/rods). Typically, metal screws and rods are placed so as to impart immediate stability while the bone mends and to increase the fusion rate (percentage of patients where the bone successfully mends together).