Musculoskeletal: Upper Extremity: First Caropmetacarpal Joint: Osteokinematics and Arthrokinematics

Question 1

Thumb: Carpometacarpal Joint
Osteokinematic: Flexion

Answer 1

• The arthrokinematics of the first CMC joint for flexion in an OPEN KINETIC CHAIN
• In an open kinetic chain the concave surface of the first proximal phalanx will roll and glide MEDIALLY on the convex surface of the trapezium.
• The arthrokinematics of the first CMC joint for flexion in an CLOSED KINETIC CHAIN
• In a closed kinetic chain the convex surface of the trapezium will roll MEDIALLY and glide LATERALLY on the concave surface of the first proximal phalanx.

Question 2

Thumb: Carpometacarpal Joint
Osteokinematic: Extension

Answer 2

• The arthrokinematics of the first CMC joint for extension in an OPEN KINETIC CHAIN.
• In an open kinetic chain the concave surface of the first proximal phalanx will roll and glide LATERALLY on the convex surface of the trapezium.
• The arthrokinematics of the first CMC joint for flexion in an CLOSED KINETIC CHAIN
• In a closed kinetic chain the convex surface of the trapezium will roll LATERALLY and glide MEDIALLY on the concave surface of the first proximal phalanx.

Question 3

Thumb: Carpometacarpal Joint
Osteokinematic: Abduction

Answer 3

• The arthrokinematics of of the first CMC joint for abduction in an OPEN KINETIC CHAIN.
• In an open kinetic chain the convex surface of the first proximal phalanx will roll PALMARILY and glide DORSALLY on the concave surface of the trapezium.
• The arthrokinematics of the first CMC joint for abduction in an CLOSED KINETIC CHAIN
• The arthrokinemtaics of the first CMC joint for abduction in a closed kinetic chain are the concave trapezium roll and glide PALMARILY on the convex first proximal phalanx.

Question 4

Thumb: Carpometacarpal Joint
Osteokinematic: Adduction

Answer 4

• The arthrokinematics of of the first CMC joint for adduction in an OPEN KINETIC CHAIN.
• In an open kinetic chain the convex surface of the first proximal phalanx will roll DORSALLY and glide PALMARILY on the concave surface of the trapezium.
• The arthrokinematics of the first CMC joint for adduction in an CLOSED KINETIC CHAIN
• The arthrokinemtaics of the first CMC joint for adduction in a closed kinetic chain are the concave trapezium roll and glide DORSALLY on the convex first proximal phalanx.