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In animal anatomy, a pivot joint (trochoid joint, rotary joint or lateral ginglymus) is a type of synovial joint whose movement axis is parallel to the long axis of the proximal bone, which typically has a convex articular surface.
The proximal radioulnar joint is a synovial pivot joint. [1] It occurs between the circumference of the head of the radius and the ring formed by the radial notch of the ulna and the annular ligament. [2] The interosseous membrane of the forearm and the annular ligament stabilise the joint. [2]
The joint space equals the distance between the involved bones of the joint. A joint space narrowing is a sign of either (or both) osteoarthritis and inflammatory degeneration. [12] The normal joint space is at least 2 mm in the hip (at the superior acetabulum), [13] at least 3 mm in the knee, [14] and 4–5 mm in the shoulder joint. [15]
The distal radioulnar articulation [1] (also known as the distal radioulnar joint, [2] or inferior radioulnar joint [1] [3]) is a synovial pivot joint between the two bones in the forearm; the radius and ulna. It is one of two joints between the radius and ulna, the other being the proximal radioulnar articulation.
In anatomy, flexor is a muscle that contracts to perform flexion (from the Latin verb flectere, to bend), [1] a movement that decreases the angle between the bones converging at a joint. For example, one's elbow joint flexes when one brings their hand closer to the shoulder, thus decreasing the angle between the upper arm and the forearm.
Bones and muscles work together to support daily movements. Physical activity strengthens muscles. Bones adapt by building more cells, and as a result, both become stronger. Strong bones and muscles protect against injury and improve balance and coordination. In addition, active adults experience less joint stiffness and improved flexibility ...
Swimming is a great way to exercise the joints with minimal damage. [3] A joint disorder is termed arthropathy, and when involving inflammation of one or more joints the disorder is called arthritis. Most joint disorders involve arthritis, but joint damage by external physical trauma is typically not termed arthritis.
Muscles involved in the front plank include: [7] Primary muscles: erector spinae , rectus abdominis (abs), and transverse abdominis . Secondary muscles ( synergists / segmental stabilizers ): trapezius (traps), rhomboids , rotator cuff , the anterior, medial, and posterior deltoid muscles (delts), pectorals (pecs), serratus anterior , gluteus ...