Flashcards in Orthopaedics (Unit 5:Common fractures) Deck (105)
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1
Which part of bone has a nerve supply?
Periosteum (the membrane which covers the outside of bones)
2
What are the 8 signs of a fracture?
Pain
Deformity
Tenderness
Swelling
Tenderness
Discolouration/bruising
Crepitus
Loss of function
3
How is swelling in a suspected fracture managed?
Raise above level of the heart
4
Why in a fracture does the disolouration change from dark to green then to yellow?
Dark = deoxygenated blood loss into soft tissues
As Hb in RBC is broken down and carried to liver by scavenger cells (colour changes to green then yellow)
5
What methods are used for investigating fractures?
X-ray
Tomograms
CAT
US
Radioisotope scanning
6
When is tomography useful when investigating fractures?
When area is difficult to distinguish due to overlapping structures (e.g. axis bone)
7
How does radioisotope scanning work?
Radioactive substance attaches to phosphate molecules that are taken up actively taken up by bone.
The more metabolically active bone is the faster it takes up radioactive substance.
On x-ray unusual metabolic activity can be seen (i.e. fracture)
8
When is radioisotope scanning useful?
When there is clinical doubt
In not acute situations (2 weeks after injury)
9
Which bone in particular is radioisotope scanning useful for?
Scaphoid
10
What should be commented on when describing a fracture?
Which bone & which side?
Open or closed?
Where on the bone is the break?
What shape is the fracture?
How many fragments
What is the position of the distal fragment?
Could it be pathological?
11
What are the 3 fracture shapes?
Spiral
Oblique
Transverse
12
In what kind of injury do spiral fractures occur and how severe are they?
Twisting (low energy)
Associated with little soft tissue damage to blood supply is preserved and healing likely
13
What might cause oblique or transverse fractures?
Buckling or direct injury to bone (high energy)
14
What are the 3 ways to describe how many fragments are present in a fracture?
Simple
Butterfly
Comminuted
15
How is the distal fragment of a fracture described?
In terms of displacement, angulation and rotation
16
How is he angulation of the distal fragment of a fracture described?
As either anterior, posterior, varus or valgus
17
What is a pathological fracture?
When a fracture seems out of proportion to the violence of the injury
18
What does the immediate management of a fracture involve?
Pain relief splintage
19
What can be used as an alternative to splintage to relieve muscle spasm in the early management of a fracture?
Traction (particularly useful in femoral neck fractures)
20
Which fractures are most likely to be at risk of large blood loss?
Major long bones (femur, tibia)
21
How many units will a patient with a femoral fracture lose?
2-3 units
22
How many units will the average person with a tibia fracture lose?
1 unit
23
How many units can an unstable pelvic fracture lose from the pelvic venous plexuses?
6 units or so
24
What is the treatment strategy for open fractures?
Clean them out and remove all dead tissue as soon as possible
25
Why are open fracture wounds sometimes left open?
If there is any doubt that closure can be achieved without any tension on the skin
26
If a patients wound is left open what extra treatment will they require?
Broad spectrum antibiotics
Tetanus protection
27
Why might a surgeon opt for a less than perfect result when managing a fracture?
The individual may be elderly or have poor bone quality and a less than perfect result might still allow them to do their daily activities (extensive treatment may have complications)
28
What process is used to return a bone to its normal position?
Reduction
29
How is closed reduction performed?
Traction on the distal fragment and relocation of the distal part back onto the proximal fragment by manipulation
30
Name 4 methods of holding a fracture
Casting
External fixation
Internal fixation
Traction
31
What factors should be considered when casting a fracture?
Maintained at proper length
Immobilise joint above & below
32
How does a cast work?
Controls joint movement and position so pressure is exerted at 3 points
33
What are the disadvantages of casting?
Heavy
Immobilise joints
Unable to examine
Unable to use x-ray
Muscle wasting (due to immobility)
34
Why do functional braces tend to be used after a few weeks?
They are highly dependent on a very accurate fit (gives time for pain and swelling to settle)
35
Which materials make ideal cast braces and why?
Glass fibre & polyurethane resin combinations (not so versatile but stronger and lighter)
36
What are the 2 stages of treating a fracture?
Reduction & Holding
37
Why are plaster splints highly unsuitable in high-energy fractures?
Assoc. with extensive soft-tissue damage so blood supply is severely damaged it is important to have an initial phase of soft tissue healing
38
Why is internal fixation hazardous to use in the management of fractures with extensive soft-tissue damage?
Ischaemia
Increases infection risk
39
How does an external fixator work?
Fixed to the bones by pins and stabilises limb by external scaffold (provides stability and allows access to soft tissues)
40
Name a downside to external fixation?
Pin sites are an easy route for infection
41
When is internal fixation used?
When a high degree of accuracy is required or other methods fail
42
What are the 4 types of internal fixation?
Apposition
Interfragmentary compression
Interfragmentary compression plus onlay device
Inlay device
43
What is apposition?
Once a fracture is realigned in only needs held in apposition for healing to procees
44
In what group is apposition particulary useful in and how is it achieved?
Children (using K wires)
45
What is interfragmentary compression and how is it achieved?
Holding 2 bone fragments firmly together (usually achieved by screws or sometimes tension band wires)
46
When is solely interfragmentary compression particularly useful?
In cancellous bone around joints
47
What are onlay devices used for in fracture management?
To buttress weak structures around joints
To fix long bones in the upper limb
48
What is the downside of olay devices?
Very rigid and inhibit natural bone union
Allow early movement but ultimately delay healing and full load bearing
49
Why are inlay devices good?
Achieve correct allignment
Don't disturb natural healing
Very strong (particularly useful in lower limb)
50
How can badly comminuted fractures be treated?
Cross screws inserted into bone using x-ray image intensifier
51
How does traction work?
Pull stimulates muscles to contract which surround the bone and hold the fracture in place
52
What are the 3 methods of traction?
Static
Dynamic
Balanced
53
Name an example of static traction
Thomas splint
54
When is balanced traction used?
Where static traction is in danger of causing damage to a part of the body through pressure
55
How does dynamic traction work?
Joints are still permitted to move by means of pulleys
56
How long are weights applied for in traction?
Short periods of time (a few days)
57
How does traction diminish the need for pain-killing drugs in femoral fractures?
Changes muscle tone to relieve spasm
58
Which specific fractures is traction particularly useful in?
Femur fractures where splintage to include the hip joint is impractical
59
What is the main downside of traction?
The injured person must remain in bed making hospital stay prolonged and nursing care difficult
60
Over what time frame does callus form in bone healing?
2-6 weeks
61
Over what time frame does new bone start forming after a fracture?
6-12 weeks
62
What sort of movement help to stimulate bone healing?
Micromovement directed along the long axis of bone at right angles to the break
63
How should low energy fractures generally be treated?
Manipulation and casting (provided holding is possible)
64
How should low energy fractures be treated if holding is difficult?
Traction
65
If a fracture is displaced and involves a joint how should it be treated?
Internal fixation
66
Why is internal fixation needed for fractures involving joints?
Needs to be very accurate and around joint cancellous bone tends to be fragmented and often with little soft tissue support
67
Why method of holding is particularly valuable in high velocity injuries?
External fixation
68
Name 6 early complications that are primary (as a consequence of the injury)?
Blood loss
Infection (open)
Fat embolism
Renal failure
Soft tissue injury
Compartment syndrome
69
Name 5 early complications that are secondary as a consequence of treatment?
Plaster disease
Renal stones
Immobility
Infection
Compartment syndrome
70
Name 5 late complications of a fracture
Non-union
Delayed union
Mal-union
Growth arrest
Arthritis
71
What is the commonest cause of bone infection in the western world?
Surgery
72
What dictates whether an infected fracture will heal?
Infection + stable = union
Infection + movement = non-union
73
How is an open infected fracture treated?
External fixation followed by surgical wound cleansing and later bone grafting
74
What precipiates pneumonitis after a fracture?
Breakdown of fats to fatty acids
75
Describe a typical patient who might get a fat embolism
Male
Under 20 y/o
Fracture of long bone
76
When do symptoms of fat embolism present?
2-5 days from injury
77
What are the symptoms of fat embolism?
Tachypnoea
Mild confusion
May have chest + neck rash
78
How is fat embolism managed?
Early diagnosis important
High % oxygen
Chest physio
Steroids given early (controversial)
79
What makes a patient prone to renal failure after a fracture?
Massive soft tissue injury
Trapped for prolonged periods
Ischaemia
80
What is found in abundance in the kidneys of patient who die from renal failure after a fracture?
Myoglobin
81
Where does compartment syndrome classically occur?
Forearm also calf
82
What structure surrounds groups of muscles?
Fascial sheath
83
What is the purpose of the fascial sheath?
Supports muscles
Gives muscles shape
Anchors muscles to bone and surrounding soft tissue
Acts as muscle boundary creating compartments
84
Why does pressure increase in a compartment if a bone is broken?
Bleeding into adjacent compartments
Inflammatory reaction
85
What is compartment syndrome?
Increased pressure leads to reduced blood flow locally to muscles resulting in ischaemia
86
What are the symptoms of compartment syndrome?
Pain out of proportion to injury
Assoc. loss of function
Altered sensation over compartment
87
How does compartment syndrome affect the distal pulse?
Distal pulse normal
88
What is a useful diagnostic test for compartment syndrome?
Stretching muscles in compartment precipitates extreme pain
89
What is the first step of management of compartment syndrome?
Remove all dressing and split the plaster
90
If conservative measures fail how is compartment syndrome treated?
Surgical opening of fascia to decompress the compartment
91
How can compartment syndrome be prevented?
Early elevation of injured limb and ensure dressing are not too tight
92
What is fracture (plaster) disease?
Muscle wasting, stiffness and skin sores
93
What does early mobilisation discourage the development of? (5 things)
Osteoporosis
Renal stone formation
Stiffness
Muscle wasting
Skin sores
94
What causes renal stone formation if patient are immobile?
Calcium from the thinning bone
95
How long do upper limb fractures take to heal if left naturally?
6 weeks or so
96
How long do lower limb fracture take to heal fi left naturally?
12 weeks or sp
97
At which site in non-union most common?
Tbia
98
Name 7 factors that might lead to non-union
Excess movement
Too little movement
Soft tissue interposition
Poor blood supply
Infection
Excessive traction or splinting bone too far apart
Intact adjacent bone (e.g. tib & fib)
99
How long is roughly defined as non-union in the upper limb?
10 weeks
100
How long roughly is defined as non-union in the lower limb?
20 weeks
101
What is delayed union?
Period between expected union and accepted non-union
102
How is non-union treated?
Remove cause
Bone graft
103
What does an autologous bone graft mean?
Taken from the bone of that individual (usually pelvis)
104
What is mal-union?
When a fracture has been allowed to heal in a position that precludes normal function
105
