Wrist Biomechanics 1
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| How many carpal bones are there? Name them. | 8...Trapezoid, trapezium, lunate, capitate, hamate, pisiform, triquetrum, scaphoid.
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| How many joints are there in the wrist? How many ligaments? | > 20, 26 named ligs
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| What are the two canals of the wrist? | guyon's canal and carpal tunnel
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| How many compartments are there in the extensor retinaculum? How many tendons in each one? | 6/ 221 211
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| What are the tendons of the 1st compartment of the extensor retinaculum? | APL & EPB
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| What are the tendons of the 2nd compartment of the extensor retinaculum? | ECRL & ECRB
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| What is the tendon of the 3rd compartment of the extensor retinaculum? | EPL
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| What are the tendons of the 4th compartment of the extensor retinaculum? | EDC & EI
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| What is the tendon of the 5th compartment of the extensor retinaculum? | EDM
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| What is the tendon of the 6th compartment of the extensor retinaculum? | ECU
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| What stabilizes the DRUJ, provides dual articular surfaces, seperates radioulnar from radiocarpal joint, and provides cushion to the ulnar side of the wrist? | the TFCC
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| What are the primary articulations of the wrist? (there are 4) | DRUJ, radiocarpal, midcarpal, and carpometacarpal
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| What kind of joint is the radiocarpal joint? How many degrees of freedom? | condyloid, 2
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| What is the open packed position of the radiocarpal joint? | slight flexion
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| What is the closed packed position of the radiocarpal joint? | full extension & radial deviation
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| Motion at the radiocarpal joint favors ______ over ______. | flexion over extension
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| The midcarpal joint is said to have a _______ configuration rather than a convex on concave. | functional
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| The midcarpal joint has __ degrees of freedom. | 2
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| Motion at the midcarpal joint favors ______ over _______ | extension over flexion
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| The axis of rotation for flexion/extension at the wrist occurs in a _________ axis between the lunate and capitate. | coronal
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| The axis of rotation for rad/ulnar deviation at the wrist occurs in a _________ axis between the lunate and capitate. | sagittal
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| Lichtman describes the carpus as a _______ system. | ring
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| What is the idea behind the ring system? | Bones within each row are tethered together by interosseous ligaments
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| Extension of the wrist is initiated at the _______ carpal row.(proximal/distal) | distal
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| radial deviation & ulnar deviation are limited in extremes of wrist flex and ext due to what? | ligamentous constraints
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| How much extension do you have at the wrist? | 70-80 degrees
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| How much flexion do you have at the wrist? | 85-90 degrees
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| How much radial deviation do you have at the wrist? | 20-25 degrees
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| How much ulnar deviation do you have at the wrist? | 30-35 degrees
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| Functional wrist flexion = ___ degrees. | 5-10 degrees
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| Functional wrist extension = ___ degrees. | 30-35 degrees
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| Functional wrist radial deviation = ___ degrees. | 10 degrees
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| Functional wrist ulnar deviation = ___ degrees. | 15 degrees
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| Which muscles in the wrist have a larger work capacity? (flexors or extensors) | flexors 2x> extensors
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| Name all of the muscles that produce wrist flexion. | FCU, FDP, FPL, FCR, FDS, PL
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| What are the three primary wrist flexors? | PL, FCR, FCU
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| What are the three secondary wrist flexors? | FPL, FDP, FDS
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| How many tendons cross the dorsal surface of the wrist? How many of these contribute to wrist function? | 9/6
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| What are the three primary wrist extensors? | ECRL, ECRB, ECU
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| What are the secondary wrist extensors? | ED, EDM, EI
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| Generally, what is the most active wrist extensor? | ECRB
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| The functional unit of the wrist complex is made up of what three bones? | scaphoid, capitate, lunate
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| Stability in the wrist is dependent upon what two things? | 1. intact ligaments 2. musculature
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| ______ acts as a pulley for the EPL | Lister’s (Dorsal Radial) tubercle
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| What carpal bones articulate with the radius at the RC jt? | Scaphoid, Lunate
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| What are the contents of the carpal tunnel? | FPL, FDP, FDS, Median nerve
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| What are the contents of Guyon’s canal? | Ulnar artery and ulnar nerve
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| The arthrokinematic motion of the midcarpal row is in the ______direction as the radiocarpal jt. | Opposite (i.e. in flexion, the radiocarpal jt glides dorsally and the midcarpal row glides anteriorly)
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| Axis of rotation for wrist flex/ext =? | Coronal between lunate and capitate
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| Axis of rotation for wrist rad/ulnar deviation =? | Sagittal between lunate and capitate
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Created by:
txst fall 2009
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