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UE Ortho
Wrist Biomechanics 1
| Question | Answer |
|---|---|
| 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
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