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