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UE Ortho

Wrist Biomechanics 1

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