Pocket Podiatry: Functional Anatomy by Watkins James & Watkins James

Author:Watkins, James & Watkins, James
Language: eng
Format: epub
ISBN: 978-0-7020-3032-1
Publisher: Elsevier Health Sciences UK
Published: 2009-05-14T16:00:00+00:00

2. Tension in the joint capsule and ligaments at the ends of the various ranges of motion.

3. Soft tissue bulk, mainly skeletal muscle, surrounding the bones forming the joint.

4. Extensibility of the skeletal muscles controlling the movement of the joint.

Shape of articular surfaces

In some joints, flexibility is limited by the impingement or interlocking of the non-articular surfaces of the bones at the end of certain ranges of motion. For example, elbow extension is restricted by the interlocking of the olecranon process of the ulna with the olecranon fossa of the humerus (Figure 5.12A). Similarly, elbow flexion is restricted by the interlocking of the coronoid process of the ulna with the coronoid fossa of the humerus (see Figure 5.12B). Lateral and medial displacement of the radius and ulna relative to the humerus in the elbow joint is severely restricted by the interlocking of the articular surfaces (see Figure 5.12C).

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