Orthotics

Orthotics (Greek: Ορθός, ortho, "to straighten" or "align") is a specialty within the medical field concerned with the design, manufacture and application of orthoses. An orthosis (plural: orthoses) is "an externally applied device used to modify the structural and functional characteristics of the neuromuscular and skeletal system". An orthotist is the primary medical clinician responsible for the prescription, manufacture and management of orthoses. An orthosis may be used to:

Orthotics combines knowledge of anatomy and physiology, pathophysiology, biomechanics and engineering. Patients who benefit from an orthosis may have a condition such as spina bifida or cerebral palsy, or have experienced a spinal cord injury or stroke. Equally, orthoses are sometimes used prophylactically or to optimise performance in sport.

Brace

Brace may refer to:

Medical

Construction and industrial arts

Other meanings

Brace (tool)

A brace or brace and bit is a hand tool used to drill holes, usually in wood. Pressure is applied to the top and the tool is rotated with a U-shaped grip.

The U-shaped part is a kind of crankshaft. It gives the brace much greater torque than other kinds of hand drill; a brace can be used to drill much wider, and deeper, holes than can a gear-driven hand drill. The price of the greater torque is lower rotational speed; it is easy for a hand drill to achieve a rotational speed of several hundred revolutions per minute, but it requires considerable effort to achieve even 100 rpm with a brace. Due to the design of the brace it tends to be easier than a power drill to keep at a precise 90 degree angle.

The front part of the brace consists of a chuck spindle with V-shaped brackets or clamps inside. Turning the spindle of the chuck in a clockwise direction tightens the drill bit in the chuck and turning in a counter-clockwise direction loosens the bit for removal.

In most braces, immediately behind the chuck is a three position gear release which allows ratcheting of the handle when in tight spots. Turning the gear release from the center position allows ratcheting the brace in the direction needed. Turning the gear release fully clockwise lets it remove wood in a clockwise direction with the ratchet action going counter-clockwise. Placing the gear release fully counter-clockwise then allows turning the brace and bit in a counter-clockwise direction, usually to remove the drill bit from the hole. The center position of the gear release prohibits the ratcheting effect.

Hat-trick

A hat-trick or hat trick in sports is the achievement of a positive feat three times in a game, or another achievement based on the number three in some sports.

Origin

The term first appeared in 1858 in cricket, to describe HH Stephenson's taking three wickets with three consecutive deliveries. Fans held a collection for Stephenson, and presented him with a hat bought with the proceeds. The term was used in print for the first time in 1868. The term was eventually adopted by many other sports including hockey, association football, water polo and team handball.

Association football

A hat-trick occurs in association football when a player scores three goals (not necessarily consecutive) in a single game, whereas scoring two goals constitutes a brace. In common with other official record-keeping rules, goals in a penalty shootout are excluded from the tally. The extra time in a knockout cup match may also be calculated towards a player's potential hat-trick. The fastest recorded time to score a hat-trick is 70 seconds, a record set by Alex Torr in a Sunday league game in 2013. The previous Guinness world record of 90 seconds was held by Tommy Ross playing for Ross County against Nairn County on 28 November 1964.

Leg

A leg is a weight bearing and locomotive 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, the table top or chair seat.

Terminology

Many taxa are characterized by the number of legs:

Legé

Legé is a commune in the Loire-Atlantique department in western France.

See also

Cathetus

In a right triangle, a cathetus (originally from the Greek word Κάθετος; plural: catheti), commonly known as a leg, is either of the sides that are adjacent to the right angle. It is occasionally called a "side about the right angle". The side opposite the right angle is the hypotenuse. In the context of the hypotenuse, the catheti are sometimes referred to simply as "the other two sides".

If the catheti of a right triangle have equal lengths, the triangle is isosceles. If they have different lengths, a distinction can be made between the minor (shorter) and major (longer) cathetus. The ratio of the lengths of the catheti defines the trigonometric functions tangent and cotangent of the acute angles in the triangle: the ratio is the tangent of the acute angle adjacent to and is also the cotangent of the acute angle adjacent to .

In a right triangle, the length of a cathetus is the geometric mean of the length of the adjacent segment cut by the altitude to the hypotenuse and the length of the whole hypotenuse.