PHTY101 Lecture Notes - Lecture 3: Proximal Radioulnar Articulation, Trochlear Notch, Hyaline Cartilage
Document Summary
Topic 3: bones, joints and muscles of the elbow region. 3. 4 identify, classify and describe the movements available at the: elbow joint radioulnar articulations, proximal (superior) radioulnar joint, distal (inferior) radioulnar joint. Articulates with head of radius articulates with trochlear notch of ulna. These articular surfaces are covered in articular cartilage. Closed pack position- 90 degrees elbow flexion with forearm being mid-way between supination and pronation. Distally at the wrist: radius is bigger than ulna: radioulnar articulations. Less bony integrity; therefore, relies a lot on the joint capsule, ligaments and interosseous membrane for support. Articular capsule- common capsule for humeroulnar, humeroradial and superior radioulnar joint. Fibrous capsule attaches to the articular margins of the radius and ulna (capsule never attaches to the radius) no direct attachment to the radius; attaches to the annular ligament that wraps around the head of the radius. Thickest and strongest at sides of joints, relatively weak anteriorly, weak posteriorly.
