Dave Practice Q's Flashcards
Superficial Fascia contents
cutaneous nerves and superficial venous system
Deep Fascia contents
muscles/tendons, arteries, deep veins, and nerves
periosteum (3rd dissection interval)
cartilage
Target tissue in surgery is what?
Bone (5th surgical layer)
Exception with Digital Anatomy (concerning surgical layers)
All neurovascular elements are in the superficial fascia
Target tissue in HAV surgery
1st MT head and Proximal phalanx base
Incision for HAV surgery
Dorsomedial incision centered over shafts of 1st MT and Hallux proximal phalanx, between medial eminence and EHL tendon
Target tissue in digital procedure
Head of the proximal phalanx
Joint capsule closure
Absorbable suture, interrupted cruciate 2-0 or 3-0 Vicryl
Which suture technique offers the most eversion of the skin edges?
Vertical Mattress interrupted suture
Deep fascia closure
2-0 or 3-0 Vicryl cruciate
Superficial fascia closure
buried interrupted (3-0 ir 4-0 Vicryl)
What is the hyponychium?
distal free edge of the nail
eponychium
aka cuticle, proximal skin fold on nail
Nail Matrix Borders
- Distal= lunula
- proximal= distal portion of the extensor ridge
- med/lat= lateral condyles of distal phalanx
When would a total nail avulsion procedure be appropriate?
nail pathology greater than 50% of the nail
When is phenol contraindicated in nail surgery? what is the alternative?
During acute infection, dont use phenol–> do a cold steel matrixectomy (15 blade)
Acisional nail procedures
- Partial nail avulsion
- Bottlecap nail avulsion
Incisional nail procedures
- Winograd
- Frost
- Zadik
When is the Winograd procedure used?
In pediatric patients or if there is hypergranular tissue
What is the advantage of the Frost procedure?
allows visualization of the nail matrix via proximal incision
When is a Zadik procedure appropriate?
For better matrix visualization during a permanent total nail avulsion
Post-Op for partial nail avulsion
1st day post-op, start soaking in epsom salt and warm water for 20min 3x a day
Post-op for total nail avulsion
NO SOAKING! Keep bandage clean/dry/intact
Overdrill
same size as the screw thread diameter, thru proximal cortex only Glide Hole
Underdrill
Thread Hole smaller than screw diameter, thru the near and far cortices **Use a drill guide to stay coaxial to the glide hole**
Countersinking
increases the surface contact area for the screw head, and makes the head less prominent (which would cause soft tissue irritation)
Measure
Using a depth gauge to determine screw length for drill hole ALWAYS after countersinking, because that step will remove some bone
Tapping
cuts the thread pattern for the screw, use the 2 forward 1 back technique
Screw
Always the last step, tighten to 2 finger tightness only
What are the 4 AO principles?
- Fracture reduction and fixation to restore anatomical relationships
- Stability by fixation or splintage, as the personality of the fracture or injury requires
- Preservation of the blood supply to soft tissue and bone by careful handling and gentle reduction techniques
- Early and safe mobilization of the part and the patient
Why do we fixate fractures/osteotomies?
Lack of motion is osteogenic, not compression!
What are the 2 components of interfragmentary compression?
- holding the near fragment with the screw head
- grabbing and pulling the far fragment with the screw threads
Screw sizes in mini-frag set
1.5, 2.0, 2.7
Screw sizes in small frag set
3.5 and 4.0
Screw sizes in large frag set
4.5 and 6.0
What are the 3 stabilization rules?
- Screw fixation
- Plate stability
- Vassals Rule
Screw fixation
Resistance of screws to tear-out depends on screw diameter, length of screw thread gripping bone, and bone strength At least 3 active screw threads are needed to maintain resistance to dislodgment
Plate stability
3 or 4 cortical threads in each main fragment distally, and 5-6 cortical threads proximally