Pediatric Musculoskeletal Injuries Flashcards
How do children’s bones differ from adult bones? What kinds of injury does this lead to?
children’s bones are more porous and pliable, which results in a greater number of incomplete fractures - due to decreased mineral content and responds to forces differently resulting in unique fracture patterns
ligaments are also relatively stronger and less likely to get injured, making younger children more likely to experience fractures than sprains or dislocations
What are the four anatomic aresa of pediatric long bones?
epiphysis
physis (growth plate)
metaphysis
diaphysis
What are the structural differences in pediatric bones?
periosteum is thick, strong, and metabolically active, holds fracture fragments in alignment and aids in reduction, healing and remodeling
extensive remodeling corrects large degrees of angulation and displacement (age < 8 yrs)
nonunion is rare
Salter-Harris Classification system
used to describe the location of a fracture in relation to the growth plate
fractures are graded as a scale from 1 to 5, with a higher classification indicating an increased risk for affecting further bone growth
type I Salter-Harris Physeal injury
separation through the physis, usually through areas of hypertrophic and degenerating cartilage cell columns
radiograph appears normally initially
diagnosed based on injury (usually shear injury), swelling, pain, and tenderness over growth plate
growth is rarely affected
type II Salter-Harris Physeal injury
fracture through a portion of the physis that extends through the metaphyses
most common fracture pattern involving growth plate
most common fracture pattern involving growth plate
type III Salter-Harris Physeal injury
fracture through a portion of the physis that extends through the epiphysis and into the joint
may interfere with growth
involves articular surface, may affect joint
type IV Salter-Harris Physeal injury
fracture across the metaphysis, physis, and epiphysis
may interfere with growth
involves articular surface, may affect joint
type V Salter-Harris Physeal Injury
crush injury to the physis/growth plate
from severe axial loading
worst prognosis with possible growth arrest
What details should be included when describing fractures?
the bone involved
the location within the bone
the fracture pattern
any displacement
age of the fracture
Does it take more force to cause a transverse fracture, spiral fracture, or spiral fracture?
transverse fracture
transverse fracture
perpendicular to long axis
complete fracture
usually higher force mechanism
direct blow or bending force
often easy to reduce
comminuted fracture
when the bone fractures in multiple places
usually takes a great amount of force
rare in young children and difficult to reduce
often require operative intervention fixation
oblique fracture
oblique to long axis of bone
twisting force or compression/bending mechanism
can have significant displacement, may be difficult to maintain alignment when reduced
spiral fracture
caused by a twisting mechanism
often takes less force than transverse fracture
What is a torus or buckle fracture?
one of the most common fracture patterns seen in children, especially the distal forearm - occurs at the junction of metaphysis and diaphysis in distal forearm, radius +/- ulna
results from a compressive load, such as a fall onto an outstretched hand
the bony cortex of the metaphysis buckles in a small area
these are stable fractures that heal quickly with simple immobilization - use premade splint for 3-4 weeks
as the skeletal system matures and the metaphyseal region becomes stiffer, the incidence of these fractures decreases
What are greenstick fractures?
the most common fracture pattern in children
result of compression or bending force and bone on convex side fails
considered incomplete fractures since the bony cortex remains intact on one side
fracture line does not propagate to the concave side (incomplete)
these fractures usually occur at the junction of the diaphysis and the metaphysis
if reduction needed, need to make break complete to maintain alignment, and casting is needed
What are bowing fractures (plastic deformation)?
compression force causes microscopic failure in bone, resulting in a bending or bowing - up to a 20 degree curve in a child <4 yrs
occur when bone bends without a clear single fracture line - usually ulna +/- radius
though often not a clear cortical defect, the deformity can still be significant and reduction may be needed
also occurs in children due to the pliability and porous nature of pediatric bones - almost unique in children
What is a toddler’s fracture?
usually refers to an oblique, non-displaced fracture in the distal tibia of an ambulating child younger than 5 years old
occurs in an oblique or spiral patterns from a twist in the lower leg while running or falling
sometimes the child’s leg gets caught in something and the fracture occurs when the child twists the leg in trying to free it
fractures may be subtle or not able to be visualized on initial radiograph
What happens in slipped capital femoral epiphysis?
occurs as aresult of instability of the proximal femoral growth plate, resulting in slippage of the epiphysis relative to the femoral neck (Salter Harris Type I fracture through the physis) - inferior and posterior slips
occurs in adolescents (10-16yrs), often during periods of rapid growth
bilateral in up to 40%
What do rib fractures indicate in a child?
an infant’s chest is more malleable than that of an older child and as a result the ribs deform rather than break, unless a major force is exerted - high specificty for abuse
most non-accidental rib fractures are thought to occur from anterior-posterior compression of the chest and are associated with intracranial injuries due to shaking of the infant
