Elbow Joint Stabilizers

1. Medial / (ulnar) collateral ligament complex (MCL)
   Origin: anteroinferior margin of medial epicondyle
   1. anterior bundle (functionally important): inserts on sublime tubercle (= anteromedial aspect of coronoid process) – resists valgus forces
   2. posterior bundle
   3. transverse (oblique) bundle = Cooper lig.
2. Lateral / radial collateral ligament complex
   Origin: inferior margin of lateral epicondyle
   1. Radial collateral ligament (RCL)
      Insertion: on annular ligament
   2. Lateral ulnar collateral ligament (LUCL): functionally important – resists varus forces
      Insertion: distal to tubercle of crista supinatoris ulnae
   3. Annular ligament

Functionally primary stabilization:

1. Ulnohumeral articulation
2. Anterior bundle of MCL
3. LUCL

Functionally secondary stabilization:

1. Radiocapitellar articulation
2. Common flexor-pronator tendon
3. Common extensor tendon
4. Joint capsule