Fracture Types and Mechanisms of Injury
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Introduction
Butterfly Fracture
Chondral, osteochondral and subchondral Fractures
Comminuted Fracture
Compound Fracture
Crush Fracture in Longbone
Crush Fracture in Spine
Depressed Fracture
Diastasis
Fracture-Dislocation
Greenstick Fracture
Impacted Fracture
Incomplete Fracture
Intra-articular Fracture
Spiral Fracture
Pathological Fracture
Stellate Fracture
Stress fracture
Subluxation (joint)
Torus Fracture
Wedge Fracture
Still to come
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Introduction
Mechanisms of InjuryKnowledge of fracture types and mechanisms can be useful for a variety of reasons.
- You will tend to look for certain types of fractures if you know the patient's mechanism of injury.
- You are more likely to look for associated fractures/co-morbidity
- You can describe the fracture to another health professional with greater accuracy and economy
Avulsion Fracture
Buckle Fracture
Fracture Type Description Mechanism Avulsion fracture fragments tend to be small bone fragments. They are often at the ends of long bones and tend to be adjacent to joints. Anywhere that there is a tendon or ligament attachment is a potential site for an avulsion fracture.
Common avulsion fractures are the ulna styloid fracture (associated with a Colles fracture) and fractures of the base of the 5th metatarsal associated with ankle inversion injuries.An avulsion fracture occurs when an injury causes a ligament or tendon to tear off (avulse) a small piece of a bone to which it's attached. The mechanism is usually a tension force which pulls the avulsed fragment off the bone.
Fracture Type Description Mechanism Buckle Fracture
A buckle fracture is an incomplete fracture in which an isolated radius of the cortex of the bone is buckled.
Butterfly Fracture
Fracture Type Description Mechanism Butterfly FractureA fracture in which the centre fragment is triangular shaped. Butterfly FractureNo particular mechanism is associated with butterfly fractures
Chondral, osteochondral and subchondral Fractures
Comminuted Fracture
Fracture Type Description Mechanism Comminuted FractureA comminuted fracture is one in which there are multiple bone fragments.
This is a comminuted fracture of the calcaneum caused by a fall from a height (so-called lover's fracture or Don Juan fracture)
Memory aid- just think of lots of minute pieces. Comminuted FractureComminuted fractures do not result from a specific mechanism but do tend to be a result of moderately large forces.
Compound Fracture
Fracture Type Description Mechanism Compound FractureThis child has a fracture of the distal 1/3 of the radius and ulna. There is evidence of air in the soft tissues (2) projected over the distal radio-ulnar joint. This would be termed a compound fracture because the skin was breached by a fractured bone and introduced air into the soft tissues.A compound fracture (syn. open fracture) is one in which the patient's skin has been punctured or torn and the skin breach is associated with the fracture.left
The finding of compound fracture is important. Compound fractures have a higher risk of infection and are usually given a higher priority for surgical treatment.
Below
Fractures of the forearm and humerus with a bone fragment penetrating the skin.
<a class="external" href="http://www.purepainracing.com/images/jake_wrist_5_.jpg" rel="nofollow" target="_blank">
</a><a class="external" href="http://www.purepainracing.com/images/jake_wrist_5_.jpg" rel="nofollow" target="_blank">http://www.purepainracing.com/images/jake_wrist_5_.jpg</a><a class="external" href="http://www.airahospital.org/?cat=14" rel="nofollow" target="_blank">http://www.airahospital.org/?cat=14</a> Compound FractureCompound fractures are usually caused by a sharp bone end protruding through the skin. There is no specific mechanism.
Memory aid- compound fractures compound a bad situation!
Crush Fracture in Longbone
Fracture Type Description Mechanism Crush FractureA crush fracture is a fracture type associated with a crushing injury. Long bone crush fractures are usually comminuted. The term crush fracture is commonly used to refer to crushing injuries of the digits and spine, but could refer to a crushing injury of any bone. Crush FractureCrush fractures in long bones result from a compression force that is applied transversely with respect to the long axis of a bone. For non-longbones, the axis of compression could be from any direction. The spine is a special case.
Crush Fracture in Spine
Depressed Fracture
Fracture Type Description Mechanism Depressed FractureA depressed fracture is one in which a fragment or group of fragments is 'pushed in'. These fractures are most frequently associated with the skull. Depressed FractureDepressed fractures suggest a direct blow or shearing force. The forces tend to be localised. For example, a blow from a hammer to the skull can cause a depressed skull fracture.
Diastasis
"Fracture" Type Description Mechanism A diastasis is an abnormal separation of two anatomical structures that are normally located together. This pelvis image demonstrates a iastasis of the symphysis pubis and the right sacroiliac joint Mechanism of injury for diastasis would include shear and tension.
Fracture-Dislocation
Fracture Type Description Mechanism Fracture-DislocationThis is a term which is used to refer to an injury that includes a fracture and a dislocation.
The image shown (left) is a Galeazzi fracture characterised as a fracture of the distal third of the radius and a dislocation of the distal radio-ulnar joint (DRUJ) Fracture-DislocationThere is no specific mechanism for fracture-dislocations
Greenstick Fracture
Impacted Fracture
Fracture Type Description Mechanism Incomplete Fracture
Incomplete Fracture
Intra-articular Fracture
Fracture Type Description Mechanism Intra-articular FractureThis calcaneal fracture extends into the proximal joint and would therefore be classified as an intra-articular fracture. Intra-articular FractureThere is no specific mechanism of injury for intra-articular fractures or extra-articular fractures.
Spiral Fracture
Fracture Type Description Mechanism Spiral FractureA spiral fracture is an obliquely orientated fracture in the shape of a spiral. These fractures sometimes have a very distinctive spiral shape.
This is a spiral fracture of the mid/distal 1/3 of the femur. Spiral FractureSpiral fractures are caused by a rotational or torsion force. A typical mechanism would be if your foot is caught and you rotate your leg, you are at risk of spiral fracture of the tibia.
Pathological Fracture
Stellate Fracture
Fracture Type Description Mechanism This patient suffered a fractured patella after falling directly onto her knee.Stellate fractures are most commonly associated with the patella. The term stellate refers to the fracture being star-shaped with the fracture lines radiating outwards from a central point. Stellate fractures could occur when any plate-like bony structure receives a sufficiently large (localised) blow. Other anatomical regions that can demonstrate stellate fractures are the skull and acetabulum. The mechanism of injury is commonly a direct impact to the patella associated with a patient falling directly onto his/her kneeor striking the knee on a dashboard in a frontal collision. This is a shearing force.
<a class="external" href="http://www.scribd.com/doc/19677370/fractures" rel="nofollow" target="_blank">adapted from http://www.scribd.com/doc/19677370/fractures</a>
Stress fracture
Fracture Type Description Mechanism
Subluxation (joint)
Torus Fracture
Fracture Type Description Mechanism Torus FractureA torus fracture is a circumferential impacted buckle fracture. The term torus refers to a 3 dimensional circular shape as shown below.Torus fracture and buckle fracture are terms that are commonly considered to be interchangeable. It would be reasonable to make a distinction between the two fractures- a buckle fracture can be localised to an isolated segment of cortex- that is, the bony cortex is buckled in an arc rather than a full circle.
<a class="external" href="http://en.wikipedia.org/wiki/Torus" rel="nofollow" target="_blank">http://en.wikipedia.org/wiki/Torus</a>
Wedge Fracture
Still to come
- Longitudinal fracture
- transverse
- oblique
- bowing
- impacted
- epiphyseal
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