tendons Flashcards
(50 cards)
carpal tunnel has which tendons?
FDS x4
FDP x4
FPL
what prevent bowstringing of the digits?
A1 pulleys
flexor tendon zone 1
distal to FDS insertion on midpoint of the middle phalanx
- only FDP injured
flexor tendon zone 2
Insertion of the FDS to level of the A1 pulley (distal to palmar crease)
flexor tendon zone 3
proximal A1 pulley to origin of lumbricals from FDP tendons (dostal edge of the transverse caprpal ligament)
flexor tendon zone 4
carpal tunnel
flexor tendon zone 5
proximal aspect of transverse carpal ligament to the musculotendinosis junction
zone T1
distal to thumb IP joint
zone T2
thumb A1 pulley to IP joint
zone T3
thenar eminence
flexor tendons are relatively ___ between vinculae
avascular
intrinsic healing of tendons occurs from?
direct blood supply or nutrients in the synovial fluid
tendons ___ after they are cut or ruptured
retract
test FDS by
Test FDP by
flexing PIP
flexing DIP
how will the injury look if it occurs when the finger is extended
skin wound and FDP, FDS tendons will be lacerated on the same level
how will the injury look if it occurs when the finger is flexed?
tendon injury will be distal to wound, FDP will be lacerated on a different level than the FDS due to different excursion
symptoms of a flexor tendon injury
abnormal cascade
passive extension of wrist does not produce finger flexion
loss of normal tension
loss of active flexion
early phase of tendon healing
0-2 weeks
inflammatory and proliferative phase
tendon is at its weakest
collagen begins laying down
intermediate phase of tendon healing
2-6 weeks
tendon beings to gain tensile stregnth
what is tensile strength?
amount of force that is tolerated by the tendon before it ruptures
late phase of tendon healing
6+ weeks
continued gain of tensile strength
at 12 weeks enough tensile strength for most functional activities
a 3mm gap can cause a repaired tendon to
fail to glide or rupture due to catching on pulley edge
3 basic protocols for a flexor tendon repair
immobilization (3-4 weeks)
early passive motion (within 24 hours of repair)
early active motion (within a few days of repair)
immobilization protocol for orthosis position
wrist flexed 20-30 degrees
MCPs flexed 50-60 degrees
IPs straight