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UE Ortho
Elbow Biomechanis 1
| Question | Answer |
|---|---|
| What are the joints of the elbow? | Humeroradial, radioulnar, Humeroulnar |
| What is the orientation of the articulating surfaces on the humerus in the frontal and sagittal plane? | 6 Degrees of valgus in the frontal, Anteriorly rotated 30 degrees in the sagittal plane. |
| Name the ligaments of the elbow. | lateral collateral lig, annular lig, medial collateral lig, capsule |
| How many parts of the medial collateral ligament are there and what are their names? | 3/anterior, oblique, posterior |
| What are the flexor muscles of the elbow? | biceps brachii, brachialis, and brachioradialis |
| What are the elbow extensor muscles of the elbow? | triceps, anconeus |
| What kind of joint is the elbow? | diarthrodial, modified hinge joint |
| How many degrees of freedom does the elbow joint have? | one |
| What is the normal AROM for flexion at the elbow? | 135-145 degrees |
| What is the normal PROM for flexion at the elbow? | 150-160 degrees |
| Normal ROM for extension at the elbow is what? | 0 degrees, maybe slight hyperextension |
| What two things may be limiting factors for ROM at the elbow? | bony opposition, tight anterior musculature & capusle |
| Elbow flexion is naturally limited in what position? | mid-to-full pronation |
| A capsular pattern of the elbow limits _____>_____. | flexion > extension |
| What is the closed packed position of the humeroulnar joint? | full extension and supination |
| What is the open packed position of the humeroulnar joint? | 70 degrees flexion and 10 degrees supination |
| What is the closed packed position of the humeroradial joint? | 90 degrees flexion and 10 degrees supination |
| What is the open packed position of the humeroradial joint? | full extension and supination |
| What muscle is the "workhorse flexor?" | brahialis |
| Muscle Activity of the brahialis is greatest at slightly > ____ degrees. | 100 |
| Is the brachialis affected by changes in forearm position? | no |
| Biceps muscle activity is greatest between __-__ degrees. | 80-100 |
| Biceps is most effective as a ________ at __ degrees of flexion. | supinator/90 |
| The brachialis, triceps, and biceps are spurt or shunt muscles? | spurt |
| The brachioradialis is a spurt or shunt muscle? | shunt |
| The brachioradialis is strongest at __-___ degrees of flexion. | 90-120 |
| Max torque of the triceps is achieved at __ degrees of flexion. | 90 |
| The medial head of the triceps is always active during what motion? | extension |
| The long and lateral heads of the triceps are active with ________ or increased speed of contraction. | resistance |
| The radial head is convex or concave? | convex |
| The radial notch is concave or convex? | concave |
| The distal end of the radius is convex or concave? | concave |
| The distal end of the ulna is convex or concave? | convex |
| What is another name for the radioulnar disc? | triangular fibrocartilage disc(TFCC) |
| What are the three functions of the TFCC? | 1.binds distal ulna and radius, 2.provides dual articular surface, 3.separates radioulnar from radiocarpal joint |
| What kind of joints are the radioulnar joints? | diarthrodial pivot joints |
| How many degrees of freedom do the radioulnar joints have? | one |
| Pronation/supination occur in what plane? | horizontal |
| How many degrees of pronation do we have? | 80-85 |
| How many degrees of supination do we have? | 85-90 |
| With a capsular pattern of the radioulnar joint _____ is limited more than _____. | pronation > supination |
| Proximal Radioulnar closed packed position is what? | full ext. and 5 deg. sup. |
| Proximal Radioulnar open packed position is what? | 70 deg. flex. and 35 deg. sup. |
| Distal Radioulnar closed packed position is what? | 5 degrees supination |
| Distal Radioulnar open packed position is what? | 10 degrees supination |
Created by:
txst fall 2009
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