Where do we use convex mirrors?
These convex mirrors are used for cars because they give an upright image and provide a wider field of view as they are curved outwards. Convex mirrors are also often found in the hallway of various buildings including hospitals, hotels, schools, stores and apartment building.
What is the concave convex rule?
The concave-convex rule by Kaltenborn tells us which part of the joint capsule is stressed when we move an adjacent joint partner: When a convex joint surface is moving, the roll and glide occur in the opposite direction. When a concave joint surface is moving, the roll and the glide occur in the same direction.
What is convex rule?
The concave-convex rule states that if a concave surface moves on a convex surface, roll and slide must occur in the same direction, and if a convex surface moves on a concave surface, roll and slide occurs in opposite directions.
What is Jointplay?
Joint play is defined by Mennell as small movements within a synovial joint that are independent of voluntary muscle contraction (1). It provides roll, glide, distraction, and spin combinations for joint motion and occurs in the shape of the joint surfaces (3).
What bones are concave or convex?
The femur is a convex surface and the tibia is a concave surface. During a squat, the femur moves on a stable tibia. The femur rolls posteriorly and slides anteriorly on the tibia. The roll and glide/slide occur in opposite directions, according to the “convex on concave” rule.
Why is the convex concave rule important?
The convex-concave rule suggests that the preferred direction of a manual glide to improve external rotation is anterior. This logic is consistent with a combined anterior slide and posterior roll during external rotation of the humeral head.
What is meant by concave forward?
Concave describes an inward curve; its opposite, convex, describes a curve that bulges outward. They are used to describe gentle, subtle curves, like the kinds found in mirrors or lenses. If you want to describe a bowl, you might say there is a large blue spot on the center of the concave side.
Is the elbow joint concave or convex?
On the lateral side, the concave end of the head of the radius meets the rounded, convex capitulum to complete the elbow joint. The loose union of the capitulum of the humerus and the head of the radius allows the radius to pivot as well as flex and extend.
What is the primary limiter of extension at the elbow?
LIMITATIONS OF MOTION Elbow extension ROM is limited by contact of the olecranon process of the ulna with the olecranon fossa of the humerus.
Is Trochlea concave or convex?
Description. The medial portion of the articular surface of distal humerus is named the trochlea, and presents a deep depression between two well-marked borders; it is convex from before backward, concave from side to side, and occupies the anterior, lower, and posterior parts of the extremity.
Is elbow a hinge joint?
The elbow is a hinged joint made up of three bones, the humerus, ulna, and radius. The ends of the bones are covered with cartilage.
What are hinge joints examples?
Hinge joints are a type of joint that functions much like the hinge on a door, allowing bones to move in one direction back and forth with limited motion along other planes. The fingers, toes, elbows, knees, and ankles contain hinge joints. Hinge joints are complex and contain many muscles and tissues.
Is knee a hinge joint?
[3][4] The hinge joints of the body include the elbow, knee, interphalangeal (IP) joints of the hand and foot and the tibiotalar joint of the ankle.
What’s the inner elbow called?
medial epicondyle