Spondylopathies are disorders of the vertebrae. When involving inflammation, it can be called spondylitis. In contrast, a spondyloarthropathy is a condition involving the vertebral joints, but many conditions involve both spondylopathy and spondyloarthropathy. Examples include ankylosing spondylitis and spondylosis. See also
Dorsopathies
Spondyloarthropathy
Spondylolisthesis
Spondylosis
Spondylitis
Spondylolysis

References


== External links ==
A leg is a weight-bearing and locomotive anatomical structure, usually having a columnar shape. During locomotion, legs function as "extensible struts". The combination of movements at all joints can be modeled as a single, linear element capable of changing length and rotating about an omnidirectional "hip" joint. As an anatomical animal structure it is used for locomotion. The distal end is often modified to distribute force (such as a foot). Most animals have an even number of legs. As a component of furniture, it is used for the economy of materials needed to provide the support for the useful surface such as the table top or chair seat. Terminology
Uniped: 1 leg, such as clams
Biped: 2 legs, such as humans and birds
Triped: 3 legs, which typically does not occur naturally in healthy animals
Quadruped: 4 legs, such as dogs and horsesMany taxa are characterized by the number of legs:

Tetrapods have four legs. Squamates of genus Bipes have only two. Caecilians and many squamate lineages convergently lost their legs. Panarthropoda: no less than 4 legs. Velvet worms and some arthropods have more than a dozen legs; a few species possess over 100. Despite what their names might suggest, centipedes ("hundred feet") may have fewer than 20 or more than 300 legs, and millipedes ("thousand feet") have fewer than 1,000 legs, but up to 750. Components
A leg is a structure of gross anatomy, meaning that it is large enough to be seen unaided. The components depend on the animal.