Test 2 Flashcards
1st Dorsal Compartment
Nerve
Muscle
Significance
Nerve: Posterior Interosseous (from radial nerve)
Muscle: Abductor Pollicis Longus and Extensor Pollicis Brevis (lower tendons of the snuff box)
Dequervain’s Syndrome
Treat Dequervain’s Syndrome
- iontophoresis with antiinflammatory, photophoresis with antiinflammatory bu ultrasound, ice, parafin
- thumb spica splint (even include IP so they dont write)
-after surgery can do friction massage to stop it from getting bound down and to desensitize the incision –important to exercise so it doenst get bound down
2nd Dorsal Compartment
Nerve
Muscle
Significance
Nerve: Radial Nerve
Muscle: ECRL, ECRB
Significance:
ECRB is stronger: it attaches to base of 3rd metacarpal so it is on the midline of the hand-mechanical advantage (dont take it off in surgery)
*ECRL attach to base of 2nd metacarpal
Which is stronger:
ECRB ECRL
ECRB is stronger: it attaches to base of 3rd metacarpal so it is on the midline of the hand-mechanical advantage (dont take it off in surgery)
*ECRL attach to base of 2nd metacarpal
3rd Dorsal Compartment
Nerve
Muscle
Significance
Nerve: Posterior Interosseous (radial)
Muscle: EPL (top of snuff box)
Significance: at listers tubercle it makes a 45 degree angle and then goes to the IP joint of the thumb
Which muscle makes a 45 degree angle at listers tubercle?
EPL, then it goes to the IP of the thumb
4th Dorsal Compartment
Nerve
Muscle
Significance
Nerve: Posterior Interosseous
Muscle: Extensor Digitorum
Significance:
- Only one muscle belly : can use to our advantage in rehab
- NO OTHER MUSCLE EXTENDS MCP
- shroud fibers attacked in RA so ED doesnt stay centralized and get ulnar deviation
Which many tendon muscle has one muscle belly that we can use to our advantage in rehab?
ED
Which muscles extend the MCPs?
ED ONLY due to shroud fibers
Why is there ulnar deviation in the fingers in RA?
cannot extend the MCP and instead ulnar deviated because the disease attacks the shroud fibers which causes the ED tendon not to be centralized and get ulnar deviation
5th Dorsal Compartment
Nerve
Muscle
Significance
Nerve: Radial Nerve
Muscle: Extensor Digiti Minimi
significance:
1. extends and abducts the pinky
inserts into the base of the 5th proximal phalanx
ALLOWS GRASP OF LARGE OBJECTS
- Abductor Digiti Minimi is ulnar nerve backup system
how to measure girth
measure of girth between tip of pinky and pulp of thumb
Backup system 5th finger
Ulnar Nerve: Abductor Digti Minimi
Radial Nerve: Extensor Digiti Minimi
THEY BOTH ABDUCT THE PINKY
6th Dorsal Compartment
Nerve
Muscle
Significance
Nerve: Posterior Interosseous
Muscle: Extensor Carpi Ulnaris
2 large heads
Which dorsal compartments have radial innervation?
2nd and 5th
ECRL and ECRB
Extensor Digiti Minimi
Which Dorsal Compartments have posterior interosseous innervation?
1, 3, 4, 6
AbPL, EPB
EPL
ED
ECU
Swan Neck Deformity Splint
hyperextension at PIP because RA or collatereal ligament issues
can use in a volar plate injury
What are the Extrinsic wrist flexors? (3)
Median Nerve
- Flexor Carpi Radialis: inserts into the third metacarpal at the midline of the hand (direct antagonist to the ECRB)
- Flexor Carpi Ulnaris
- Palmaris Longus: inserts into the palmar fascia (missing in 15% of ppl, used for transplants)
What is the antagonist of the FCR?
ECRB
What is the antagonist of the FCU?
actually it is a synergist with ___ ULNAR DEVIATION
What is the synergist of the FCU?
ECU for ulnar deviation
FDP
2 Nerves:
- anterior interosseous nerve (Median)
- ulnar nerve
1 muscle belly : mass action muscle 1 belly divides into 4 tendons (can work other tendons to prevent atrophy, but hard to clinically diagnose)
this muscle belly can get into the carpal tunnel and cause carpal tunnel syndrome
Deep group: finger flexors (2)
- Flexor Digitorum Profundus (dual innervation: anterior interosseous of the median nerve and the ulnar nerve)
- Flexor Pollicis Longus (it is stronger than the EPL)
Flexor Pollicis Longus
Median Nerve
Deep finger flexor
need for pinch and opposition
stronger than the EPL because more on the middle of the bone so more mechanical advantage
What is stronger EPL or FPL?
FPL stronger than the EPL because more on the middle of the bone so more mechanical advantage
FPL is median nerve
EPL is Posterior Interosseous (radial)
Finger Flexors: Superficial Group:
Flexor Digitorum Superficialis
- FOUR DIFFERENT MUSCLE BELLIES–in treating the FDS need to treat the specific muscle belly
- clinically can bend one and not the others in diagnosis to see what is ruptured
-median nerve
Flexor Digitorum Superficialis
median nerve
4 distinct muscle bellies
- in treating the FDS need to treat the specific muscle belly
- clinically can bend one and not the others in diagnosis to see what is ruptured
**after carpal tunnel surgery need to mobilize so it doesnt get bound down
(palpation: claw and feel radial to FCU and under the palmaris longus)
Vinicula Longus and Viniculum Brevis
blood supply to the tendons of FDP and FDS
come off digital artery of the finger
after a flexor tendon repair it pops because of loss of blood supply and now they repair the digital artery and get the vanicula longa and brevis which supply blood to the tendons
Kleiner’s Traction
what is it, when is it used,
need to be able to follow instructions
for flexor tendon injury: ie after cut bagel
–suture through fatty part of finger and hook onto rubberband
–24/7: Dorsal Hood Splint on dorsal forarem pull MCP into 90 degrees of flexion and doesnt allow full extension so as not to stretch the new repair tendon
need to exercise with it
–they extend PIP so volar plate not get stuck (it is tight in extension)–collaterals would be fine because they are taut in all positions
actively make a fist at 3.5 weeks
full excursion open up to see if PIP can get straight at 5 weeks
Volar Plate Vs Collaterals
MCP collateral: oblique: tight in flexion, loose in extension (this is why splint needs to be before palmar crease so we can stretch it)
PIP and DIP collaterals: true collaterals are always taut
Volar Plate: prevent hyperextension at MCP, PIP, and DIP but allows most motion at MCP since it attaches to soft tissue fascia there
PT protocol with Kleiners traction
–24/7: Dorsal Hood Splint on dorsal forarem pull MCP into 90 degrees of flexion and doesnt allow full extension so as not to stretch the new repair tendon
need to exercise with it
–they extend PIP so volar plate not get stuck (it is tight in extension)–collaterals would be fine because they are taut in all positions
actively make a fist at 3.5 weeks
full excursion open up to see if PIP can get straight at 5 weeks
Pulley System
–what is A, what is C: which is most important
A = Annular: straight across
Most important = A2: base of proximal phalanx
—if tear A2 wont be able to have strength in tight excursion especially if ring finger or pinky (power fingers)
A4: middle of middle phalanx
need A2 and A4 for a good fist
C = Cruciate: criss cross: dont necessarily do a surgery if cut
A2
A = Annular: straight across
Most important = A2: base of proximal phalanx
—if tear A2 wont be able to have strength in tight excursion especially if ring finger or pinky
ring finger and pinky are the power fingers
Why we need A2 and A4
need A2 and A4 for a good fist : holds flexor tendon to the bone
Most important = A2: base of proximal phalanx
A4: middle of middle phalanx
Annular vs Cruciate
annular goes straight across so it is more important than the cruciates that criss cross
Swan Neck Deformity
HYPEREXTENSION PIP
1) RA: ED falls into the gully because attack shroud fibers
2) FDS tendon is cut and ED pulls too hard into extension causing ricavatum or hyperextension of PIP
(ED and FDS are antagonists, so if FDS is cut, ED pulls into hyperextension)
What is cut to cause Swan Neck deformity
FDS
FDS tendon is cut and ED pulls too hard into extension causing ricavatum or hyperextension of PIP
(ED and FDS are antagonists, so if FDS is cut, ED pulls into hyperextension)
Thenar Eminance
Positioning Muscles (3)
Median Nerve
- Opponins Pollicis
- Abductor Pollicis Brevis
- Superficial head of Flexor Pollicis Brevis
Thenar Eminance
Power Muscles (3)
Ulnar Nerve
- Deep head of Flexor Pollicis Brevis
- Adductor Pollicis
- 1st Dorsal Interossei
Opponins Pollicis
Role in thumb
Power vs positioner
Positioner, median nerve
Abductor Pollicis Brevis
Role in thumb
Power vs positioner
Positioner, median nerve