Close Packed - Open Packed Positions

What is the close-packed position of the facet joints?

rotation extension lateral side bending flexion Correct Answer: extension The close packed position of the facet joints is extension. The open packed position is midway between flexion and extension.

What is the close packed position of the radiocarpal joint?

wrist flexion with radial deviation wrist extension with radial deviation wrist extension with ulnar deviation wrist flexion with ulnar deviation Correct Answer: wrist extension with radial deviation The close packed position of the radiocarpal joint is wrist extension with radial deviation. The radiocarpal joint has two degrees of freedom. It is encased in a strong capsule reinforced by numerous ligaments shared with the midcarpal joint.

What is the close packed position of the hip?

30 degrees flexion, 30 degrees abduction, slight lateral rotation 45 degrees flexion, 45 degrees abduction, slight medial rotation full flexion, lateral rotation full extension, medial rotation Correct Answer: full extension, medial rotation The close packed position of the hip is full extension and medial rotation. Some authors include abduction. In this position, the joint structures are the most congruent and the ligaments and capsule are maximally taut.

What is the open packed position for the glenohumeral joint?

55 degrees of abduction, 30 degrees of horizontal adduction 30 degrees of flexion, 30 degrees of abduction 20 degrees of abduction, 55 degrees of horizontal adduction 30 degrees of flexion, 55 degrees of abduction Correct Answer: 55 degrees of abduction, 30 degrees of horizontal adduction The glenohumeral joint is formed by the convex head of the humerus and the concave glenoid fossa of the scapula. The open packed position is 55 degrees abduction and 30 degrees horizontal adduction.

Which articulation has a loose packed position most consistent with 10 degrees of supination?

distal radioulnar joint proximal radioulnar joint radiohumeral radiocarpal Correct Answer: distal radioulnar joint The distal radioulnar joint consists of a convex ulna and a concave radius.

Maximum dorsiflexion is the close packed position for the:

distal tibiofibular joint midtarsal joint subtalar joint talocrural joint Correct Answer: talocrural joint The talocrural joint is formed by the articulations of the distal tibia, talus, and fibula.

What is the loose packed position of the radiohumeral joint?

full elbow extension and forearm supination full elbow flexion and forearm supination full elbow extension and forearm pronation full elbow flexion and forearm pronation Correct Answer: full elbow extension and forearm supination The loose packed position of the radiohumeral joint is full elbow extension and forearm supination. The proximal joint surface of the radiohumeral joint is the ball-shaped capitulum of the distal humerus. The distal joint surface is the concave head of the radius.

What is the close packed position of the acromioclavicular joint?

maximum shoulder elevation arm resting by the side full shoulder abduction and lateral rotation 90 degrees of shoulder abduction Correct Answer: 90 degrees of shoulder abduction The close packed position of the acromioclavicular joint is 90 degrees of abduction. The acromioclavicular joint functions to maintain the relationship between the scapula and clavicle during glenohumeral range of motion.

What is the close packed position of the temporomandibular joint?

mouth maximally open, teeth not touching mouth maximally closed, teeth clenched jaw protraction jaw retraction Correct Answer: mouth maximally closed, teeth clenched The close packed position of the temporomandibular joint is with the mouth maximally closed and teeth clenched. The close packed position of a joint occurs when the joint is maximally congruent and the surrounding ligamentous structures are maximally taut.

The close packed position of the hip is especially important for which process that can help prevent osteoarthritis?

stretching the capsule maintaining proper ligamentous tension nourishment of the articular cartilage decreasing hip range of motion Correct Answer: nourishment of the articular cartilage The close packed position of the hip forces synovial fluid into the articular cartilage which nourishes the cartilage and helps to prevent the degradation commonly seen in osteoarthritis. The close packed position of the hip is full extension and medial rotation.