Hand Flashcards
Tell me what are in the 6 dorsal compartments of the wrist?
- Abductor PL, Extensor PB
2.ECRL, ECRB - Extensor PL
- EDC, EIP
- EDM
- ECU
What structure centralizes the extensor mechanism and attaches to the volar plate at the MCP joint?
Sagittal band
What structure helps with PIP extension?
What structure helps with DIP extension?
Central slip
Lateral bands
Injury to the transverse retinacular ligament may result in what deformity?
Swan neck deformity
Whats in the carpal tunnel?
FDS
FDP
FPL
Mediain Nerve
What innervates the interosseous muscles?
Ulnar nerve
Limited PIP flexion with MCP extension?
Intrinsic tightness
Limited PIP flexion with MCP flexion?
Extrinisic tightness
What does the AIN innervate?
FPL
Index and long FDP
Pronator quadtraus
Radial nerve proper innervates?
Triceps
Anconeus
Brachioradialis
ECRL
The terminal branch of the PIN lies where?
Floor of the fourth dorsal compartment
For DRF, what is the average radial height, inclination, volar tilt?
Radial Height: 11 mm (accept less than 5 degree change)
Inclination: 22 deg (accept less than 5 degree change)
Volar tilt: 11 deg (accept less than 10 degree dorsal anglulation)
What is the main blood supply to the scaphoid?
Dorsal branch of the radial artery distal to waist that flows retrograde
DISI indicates what ligament was injured?
SL ligament
CID (Carpal instability dissociative)
Carpal instability adaptive results from ?
Malunited distal radius fracture
What are the 4 stages of a perilunate dislocation?
- SL disruption
- CL disruption
- LT disruption
4, Circumferential disruption, short radiolunate remains attached
What is the acceptable angulation for metacarpal neck fractures of the index and long fingers?
Less than 15-20 degrees
For metacarpal shaft fracture, what is the acceptable shortening?
Less than 5 mm
Every 2 mm of metacarpal shortening leads to how many degrees of extensor lag?
7 degrees
How do I reduce a thumb metacarpal dislocation?
TAPE: traction, abduction, pronation, extension
In Skiers thumb or gamekeepers thumb, what is injured?
The UCL of the MCP
In testing the MCP, what is injured if:
There is instability at 30 degrees
There is instability at neutral
30 deg is proper UCl and/or dorsal capsular injury
Neutral is the accessory UCL and/or volar plate injury
(more than 35 degrees of opening overall or 20 degrees more than the contralateral side)