quiz-11/13/17 Flashcards
(149 cards)
Distal Radius Fractures
One of the most common fractures in adults & usually from a fall on an outstretched hand (FOOSH)
Often associated with co-occurring injury
Radial fractures can cause shortening of the bone which can lead to ulnar abutment syndrome
Colles
Dorsal angulation
Smith
Volar angulation, less common than Colles
- falling with wrist in supination or flexion
Colles fractures- Fracture of the distal radius with DORSAL angulation
Surgical goal restore radial length and joint alignment to avoid ulnar abutment syndrome (compression of TFCC)
If fracture crosses the distal radial ulnar joint (DRUJ) or has involvement of the ulna then supination, pronation and radial/ulnar deviation will be affected
Closed reduction -
no incision made, the fracture is manipulated & realigned under X-ray fluoroscopy or just by feel and a cast is then usually applied.
Smith’s fracture
Volar angulation of distal fragment
Less common than Colles’
Smith’s and colles fracture can cause harm to what nerve?
Median Nerve
Non-articular fractures are easier to treat.
Can be treated non-operatively with immobilization.
Articular fractures involve the joint surface and usually require
external fixation to re-establish normal anatomical surfaces and alignment. If the joint surfaces are not preserved this will lead to pain, limitations in motion and arthritis from wear and tear.
Secondary complication- radius can shorten which causes ulnar abutment
If you have shortening- you get flattening of the incline because the radius is shorter
Positive for ulnar variance
the TFCC gets pinched- this creates ulnar sided wrist pain- supination makes it worse or if you add grip (shoves the ulna even farther in there)
- increases the load on the ulna
Ulnar Abutment Syndrome
-Ulnar sided wrist pain
Pain with supination (ulna migrates distally with supination. If a positive variance exists then more pressure on TFCC and carpals)
-Pain with weight beating and power grip secondary to change in load
-Normally a 22 degree incline between ulna and radius. Weight is distributed approximately 80% radius and 20% ulna.
Kienbock’s Disease
Avascular necrosis- death of the tissue because lack of blood flow
Surgical fixation methods for distal radius fractures
- Arthroscopic pinning
- Volar or dorsal plating and screws
- Cast applied two weeks the wrist control splint.
Percutaneous pinning
This can be added after reduction to provide additional stability
Pins for 6- 8 weeks
The superficial radial nerve is affected in up to 25%
External fixation used on:
Unstable Fractures
When the Fractures Extend Proximally up the Radius
Radiocarpal joint too smashed
Open and grossly contaminated fractures
The joint space has been compromised (not enough space or the articular surfaces don’t match up)
Open Reduction Internal Fixation
Volar plate fixation most common procedure but starting to see some dorsal.
Goal to restore close to normal anatomical position and joint surfaces.
Casted 2 weeks (performing tendon glides, AROM of digits, edema control) then thermoplastic wrist control splint is fabricated. Patient is instructed to remove splint to perform gentle ROM exercises 3 or 4 times a day.
Fracture Splint Following ORIF for distal radius fractures
Following a volar or dorsal plate procedure the wrist is immobilized 2 weeks then gentle AROM is allowed. A wrist control splint is fabricated and the patient can remove to perform exercises.
Management of carpal fractures
Carpal fractures are considerably less common than distal radius fractures.
Scaphoid fractures are the second most common wrist injury & most commonly fractured carpal bone.
Carpal fractures can be a diagnostic challenge
If the fracture is stable, immobilization by casting is the treatment of choice
Scaphoid
60-80% of carpal fractures involve this bone.
Forearm & thumb will have a thumb spica cast with IP free for 6 to 8 weeks.
Wrist immobilization with slight palmar flexion and radial deviation.
Splinting after cast removal is common.
Men are 10 times more likely to
fracture their scaphoid than women
This fracture is missed because:
- Feels like a sprain.
- Unlike the forearm, hand, and finger bones, fractures of the scaphoid rarely show any obvious deformity.
- Diagnosis delayed for weeks, months or even years
- The fracture may occasionally be invisible on the first x-ray, only to show up on an x-ray taken weeks or months later when bone re-absorption at the fracture site occurs
Scaphoid Fracture: Common Presentation is pain in snuffbox
Limited ROM due to pain (extension /RD)
Decreased grip strength
Painful grip and pinch
healing time for scaphoid fracture- Expected time to union for acute fractures is 6-24 weeks:
(1) Distal third = 6-8 weeks
(2) Middle third = 8-12 weeks
(3) Proximal third = 12-24 weeks