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