Musculoskeletal: Upper Extremity: Glenohumeral Joint: Osteokinematics and Arthrokinematics

Question 1

Shoulder: Glenohumeral Joint
Osteokinematic: Flexion

Answer 1

• The Arthrokinematics of GH Flexion in an OPEN KINETIC CHAIN:
• The CONVEX head of the HUMERUS moves POSTERIORLY on the CONCAVE surface of the GLENOID CAVITY, due to the ANTERIOR movement of the shaft of the HUMERUS.

(Humeral Head moves OPPOSITE humeral SHAFT)

• The Arthrokinematics of GH Flexion in a CLOSED KINETIC CHAIN:
• The CONCAVE surface of the GLENOID CAVITY, moves ANTERIORLY on the CONVEX head of the HUMERUS due to the ANTERIOR movement of the shaft of the HUMERUS.

Scapula including the glenoid cavity moves THE SAME DIRECTION as the humeral head/shaft due to the humeral head/shaft being fixed)

Question 2

Shoulder: Glenohumeral Joint
Osteokinematic: Extension

Answer 2

• The Arthrokinematics of GH Extension in an OPEN KINETIC CHAIN:
• The CONVEX head of the HUMERUS moves ANTERIORLY on the CONCAVE surface of the GLENOID CAVITY, due to the POSTERIOR movement of the shaft of the HUMERUS.

(Humeral Head moves OPPOSITE humeral SHAFT)

• The Arthrokinematics of GH Extension in a CLOSED KINETIC CHAIN:
• The CONCAVE surface of the GLENOID CAVITY, moves POSTERIORLY on the CONVEX head of the HUMERUS due to the POSTERIOR movement of the shaft of the HUMERUS.

Scapula including the glenoid cavity moves THE SAME DIRECTION as the humeral head/shaft due to the humeral head/shaft being fixed)

Question 3

Shoulder: Glenohumeral Joint
Osteokinematic: Abduction

Answer 3

• The Arthrokinematics of GH Abduction in an OPEN KINETIC CHAIN:
• The CONVEX head of the HUMERUS moves INFERIORLY on the CONCAVE surface of the GLENOID CAVITY, due to the SUPERIOR movement of the shaft of the HUMERUS.

(Humeral Head moves OPPOSITE humeral SHAFT)

• The Arthrokinematics of GH Abduction in a CLOSED KINETIC CHAIN:
• The CONCAVE surface of the GLENOID CAVITY, moves SUPERIORLY on the CONVEX head of the HUMERUS due to the SUPERIOR movement of the shaft of the HUMERUS.

Scapula including the glenoid cavity moves THE SAME DIRECTION as the humeral head/shaft due to the humeral head/shaft being fixed)

Question 4

Shoulder: Glenohumeral Joint
Osteokinematic: Adduction

Answer 4

• The Arthrokinematics of GH Adduction in an OPEN KINETIC CHAIN:
• The CONVEX head of the HUMERUS moves SUPERIORLY on the CONCAVE surface of the GLENOID CAVITY, due to the INFERIOR movement of the shaft of the HUMERUS.

(Humeral Head moves OPPOSITE humeral SHAFT)

• The Arthrokinematics of GH Extension in a CLOSED KINETIC CHAIN:
• The CONCAVE surface of the GLENOID CAVITY, moves INFERIORLY on the CONVEX head of the HUMERUS due to the INFERIOR movement of the shaft of the HUMERUS.

Scapula including the glenoid cavity moves THE SAME DIRECTION as the humeral head/shaft due to the humeral head/shaft being fixed)

Question 5

Shoulder: Glenohumeral Joint
Osteokinematic: External Rotation

Answer 5

• The Arthrokinematics of GH External Rotation in an OPEN KINETIC CHAIN:
• The CONVEX head of the HUMERUS moves ANTERIORLY on the CONCAVE surface of the GLENOID CAVITY, due to the POSTERIOR movement of the shaft of the HUMERUS.

(Humeral Head moves OPPOSITE humeral SHAFT)

• The Arthrokinematics of GH Extension in a CLOSED KINETIC CHAIN:
• The CONCAVE surface of the GLENOID CAVITY, moves POSTERIORLY on the CONVEX head of the HUMERUS due to the POSTERIOR movement of the shaft of the HUMERUS.

Scapula including the glenoid cavity moves THE SAME DIRECTION as the humeral head/shaft due to the humeral head/shaft being fixed)

Question 6

Shoulder: Glenohumeral Joint
Osteokinematic: Internal Rotation

Answer 6

• The Arthrokinematics of GH Internal Rotation in an OPEN KINETIC CHAIN:
• The CONVEX head of the HUMERUS moves POSTERIORLY on the CONCAVE surface of the GLENOID CAVITY, due to the ANTERIOR movement of the shaft of the HUMERUS.

(Humeral Head moves OPPOSITE humeral SHAFT)

• The Arthrokinematics of GH Flexion in a CLOSED KINETIC CHAIN:
• The CONCAVE surface of the GLENOID CAVITY, moves ANTERIORLY on the CONVEX head of the HUMERUS due to the ANTERIOR movement of the shaft of the HUMERUS.

Scapula including the glenoid cavity moves THE SAME DIRECTION as the humeral head/shaft due to the humeral head/shaft being fixed)

Question 7

Shoulder: Glenohumeral Joint
Osteokinematic: Horizontal Abduction

Answer 7

• The Arthrokinematics of GH Extension in an OPEN KINETIC CHAIN:
• The CONVEX head of the HUMERUS moves ANTERIORLY on the CONCAVE surface of the GLENOID CAVITY, due to the POSTERIOR movement of the shaft of the HUMERUS.

(Humeral Head moves OPPOSITE humeral SHAFT)

• The Arthrokinematics of GH Extension in a CLOSED KINETIC CHAIN:
• The CONCAVE surface of the GLENOID CAVITY, moves POSTERIORLY on the CONVEX head of the HUMERUS due to the POSTERIOR movement of the shaft of the HUMERUS.

Scapula including the glenoid cavity moves THE SAME DIRECTION as the humeral head/shaft due to the humeral head/shaft being fixed)

Question 8

Shoulder: Glenohumeral Joint
Osteokinematic: Horizontal Adduction

Answer 8

• The Arthrokinematics of GH Flexion in an OPEN KINETIC CHAIN:
• The CONVEX head of the HUMERUS moves POSTERIORLY on the CONCAVE surface of the GLENOID CAVITY, due to the ANTERIOR movement of the shaft of the HUMERUS.

(Humeral Head moves OPPOSITE humeral SHAFT)

• The Arthrokinematics of GH Flexion in a CLOSED KINETIC CHAIN:
• The CONCAVE surface of the GLENOID CAVITY, moves ANTERIORLY on the CONVEX head of the HUMERUS due to the ANTERIOR movement of the shaft of the HUMERUS.

Scapula including the glenoid cavity moves THE SAME DIRECTION as the humeral head/shaft due to the humeral head/shaft being fixed)