KIN: Elbow 1/2
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| What type of joint is the elbow joint? | Hinge
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| What side of the humerus is the trochlea on? | Medial
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| Where is one of the thinnest areas of cartilage in the human body? | Elbow joint
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| Where is the coronoid fossa located? | Above the trochlear groove
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| What bone articulates with the trochlea? | Ulna
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| What bone articulates with the capitulum? | Radius
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| Where is the radial fossa located? | Above capitulum
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| Where does the biceps brachii insert? | Bicipital tuberosity
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| How is the radial articulation with the humerus typically fractured? | FOOSH
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| Arthrokinematics of HUJ? | Roll and slide same (Concave on convex)
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| Is there much contact in the HRJ at rest in full extension? | No
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| What type of joint does the HRJ act like during pronation/supination? | Pivot
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| Arthrokinematics for HRJ | Roll and slide same (Concave on convex)
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| Does the elbow have very good dynamic stability? | No
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| What does the elbow rely on? | Static constraints
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| What makes up the elbow stability? | Articular surface - 50%
Collateral ligaments - 50%
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| Is injury more common to MCL or LCL of elbow? | MCL
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| Where does the anterior part of the MCL attach?? | Coronoid process of ulna
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| What is the primary stabilizer to valgus stress from 20 - 120 degrees? | Anterior part of MCL
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| Which part of the MCL stays on the ulna? | Oblique
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| Which band of the MCL is the strongest and stiffest? | Anterior
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| When do the posterior fibers become taut? | Deep flexion
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| When are the majority of the MCL fibers taut? | Extension
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| Does the MCL complex originate at the center of the axis of elbow rotation? | No
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| How is the MCL shaped? | Triangular
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| How is the LCL shaped? | Fan-shaped
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| Which is stronger, MCL or LCL? | MCL
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| Where does the LCL run? | Lateral epicondyle of humerus to annular ligament and olecranon process
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| Does the LCL complex lie in the center of the joint axis? What does this mean? | Yes
Consistent length throughout ROM
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| What motions increase tension on the MCL-A? | Valgus
Extension>Flexion
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| What motions increase tension on MCL-P? | Valgus
Flexion
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| What motions increase tension on LCL-RC? | Varus
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| What motions increase tension on LCL-LUC? | Varus
Flexion
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| What motions increase tension on Annular? | Distraction of radius
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| 50% resectino of olecranon process does what for stability? | Decreases
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| What are the flexors of the elbow? | Biceps
Brachialis
Brachioradialis
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| What are the extensors of the elbow? | Triceps
Anconeus
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| O of biceps brachii? | SH - corocoid process
LH - supraglenoid tubercle
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| I of biceps brachii? | Biceps tuberosity
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| Where will the biceps brachii have maximal EMB? | Simultaneous supination and flexion
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| O of brachialis? | Anterior surface of lower portion of humeral shaft
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| I of brachialis? | Coronoid process of proximal ulna
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| Where is the brachialis in relation to biceps brachii? | Deep
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| What muscle has the largest cross sectional area of any elbow mucle? | Brachialis
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| What is the primary elbow flexor? | Brachialis
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| O of brachioradialis? | Lateral supracondyler ridge of distal lateral 2/3 of humerus
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| I of brachiradialis? | Lower end of radius just proximal to styloid process
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| Do motions of pronation or supination have an effect on brachialis? Why/Why not? | No
Because of the attachment to distal ulna
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| What position should your arm be in to check biceps brachii? | Supination
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| What position should your arm be in to check brachioradialis? | Neutral
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| What position should your arm be in to check brachiallis? | Pronation
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