What are the collateral ligaments of the elbow?
Sometimes also referred to as the ulnar collateral ligament (UCL), the MCL of the elbow attaches the ulna (which, along with the radius, makes up the bones of the lower arm) to the humerus, the bone of the upper arm.
Where is radial collateral ligament located?
The radial collateral ligament connects the radial styloid process with the scaphoid running in a fan-shaped, fairly longitudinal orientation forming the most radial part of the radiocarpal joint capsule. It is located deep to abductor pollicis longus and extensor pollicis brevis tendons 1-6.
What is the name of the ring shaped ligament around the radial head in the elbow?
Annular ligament, which wraps around the radial head (the word annular means “ring-shaped”). The annular ligament cinches the radius to the ulna without interfering with the rotation of the radial head.
What is the name of the ligament that holds the radial head in place?
The annular ligament
The annular ligament stabilizes the radial head within the radial notch of the ulna as it rotates during supination and pronation of the forearm.
Is the radial collateral ligament medial or lateral?
The medial (ulnar) collateral ligament (MCL) supports the ulnohumeral and radiohumeral joints medially, and is a fan-shaped structure. The lateral (radial) collateral ligament (LCL) also supports the ulnohumeral and radiohumeral joints, but laterally. It is more of a cord-like structure.
What ligament wraps around head of the radius?
The annular ligament forms a ring that surrounds the radial head, attaching to the anterior and posterior margins of the radial notch of the ulna [1, 6, 7].
Where does the radial collateral ligament come from?
The radial collateral liga- ment originates and attaches slightly closer to the joint mar- gin and courses less vertically than its ulnar counterpart. The accessory collateral ligaments originate just palmar to the collateral ligaments and insert on the lateral sides of the volar plate.
Is the lateral ulnar collateral ligament low signal?
The normal lateral ulnar collateral and radial collateral ligaments are low in signal on all sequences.
When does the lateral collateral ligament stabilize the annular ligament?
The accessory lateral collateral ligament stabilizes the annular ligament, particularly during varus stress (5a). 5,11
Can a radial head fracture complicate a collateral ligament injury?
Associated fractures of the coronoid process or radial head or avulsion fractures at the origin of the collateral ligaments may complicate the ligamentous injury. 18 In a small subset of patients, adequate healing of the lateral supporting structures does not occur and posterolateral rotatory instability may ensue.