CMC Joint Anatomy and Function

The video tutorial by Adip on the Movement Science channel explains the structure and function of the first CMC joint, focusing on its saddle-shaped articulation, the role of the capsule and ligaments, and the range of motion. It highlights the unique orientation of the trapezium bone, which affects movement, and discusses the body's adaptation in cases of osteoarthritis. The tutorial concludes with a summary of key points covered.

What is the primary focus of the video tutorial?

• The biomechanics of the entire body

• The physiology of the thumb

• The anatomy of the human hand

• The structure and function of the first CMC joint

What type of articulation is found in the first CMC joint?

• Pivot

• Saddle shape

• Hinge

• Ball and socket

Which plane is associated with the concave surface of the trapezium?

• Oblique plane

• Transverse plane

• Sagittal plane

• Frontal plane

What is the nature of the capsule in the neutral position of the CMC joint?

• Compressed

• Tight

• Loose

• Rigid

Which ligaments are key stabilizers of the CMC joint?

• Dorso radial and anterior oblique ligaments

• Collateral and cruciate ligaments

• Ulnar and radial ligaments

• Patellar and popliteal ligaments

What is the range of flexion and extension in the CMC joint?

• 60°

• 17°

• 53°

• 42°

How does the medial orientation of the trapezium affect movement?

• It restricts all movement

• It changes the axis and alters movement

• It has no effect on movement

• It enhances flexion only

What is the incidence of CMC osteoarthritis in women compared to men?

• Non-existent in women

• Equal in both

• Higher in women

• Lower in women

What adaptation occurs when the CMC joint is fused due to osteoarthritis?

• The joint becomes immobile

• The trapezio scaphoid joint adapts to a saddle shape

• The hand becomes weaker

• The thumb loses all function

What is the purpose of the trapezio scaphoid joint adapting to a saddle shape?

• To enhance grip strength

• To reduce pain

• To maintain opposition movement

• To increase thumb length