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A saddle joint (sellar joint, [1] [2] articulation by reciprocal reception [citation needed]) is a type of synovial joint in which the opposing surfaces are reciprocally concave and convex. It is found in the thumb , the thorax , the middle ear , and the heel .
The calcaneocuboid joint is conventionally described as among the least mobile joints in the human foot. The articular surfaces of the two bones are relatively flat with some irregular undulations, which seem to suggest movement limited to a single rotation and some translation. However, the cuboid rotates as much as 25° about an oblique axis ...
Trapeziometacarpal osteoarthritis (TMC OA) is, also known as osteoarthritis at the base of the thumb, thumb carpometacarpal osteoarthritis, basilar (or basal) joint arthritis, or as rhizarthrosis. [3][1][2] This joint is formed by the trapezium bone of the wrist and the metacarpal bone of the thumb. This is one of the joints where most humans ...
Shoulder girdle. The shoulder girdle or pectoral girdle is the set of bones in the appendicular skeleton which connects to the arm on each side. In humans, it consists of the clavicle and scapula; in those species with three bones in the shoulder, it consists of the clavicle, scapula, and coracoid. Some mammalian species (such as the dog and ...
Coping (joinery) A scribed joint (right end of sketch) is derived from an internal mitre cut (left end) by cutting along the inside face of the mitre cut at a right angle to the board, typically with a coping saw. Scribing a pencil line to fit two pieces of wood together. Coping or scribing is the woodworking technique of shaping the end of a ...
Amphiarthrosis is a type of continuous, slightly movable joint. [1] Most amphiarthroses are held together by cartilage, as a result of which limited movements between the bones is made possible. An example is the joints of the vertebral column only allow for small movements between adjacent vertebrae, but when added together, these movements ...
Anterior aspect. The ball-and-socket joint (or spheroid joint) is a type of synovial joint in which the ball-shaped surface of one rounded bone fits into the cup-like depression of another bone. The distal bone is capable of motion around an indefinite number of axes, which have one common center. This enables the joint to move in many ...
A saddle, regardless of type, must fit both horse and rider. Saddle fitting is an art and in ideal circumstances is performed by a professional saddle maker or saddle fitter. Custom-made saddles designed for an individual horse and rider will fit the best, but are also the most expensive.