basic principles in the assessment and treatment of fractures in skeletally immature patients
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Basic Principles in the Assessment and Treatment of Fractures in Skeletally Immature Patients. Joshua Klatt, MD Original Author: Steven Frick, MD; March 2004 1st Revision: Steven Frick, MD; August 2006 2nd Revision: Joshua Klatt, MD; December 2010. Anatomy Unique to Skeletally Immature Bones. - PowerPoint PPT PresentationTRANSCRIPT
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Basic Principles in the Assessment and Treatmentof Fractures in Skeletally
Immature Patients
Joshua Klatt, MD
Original Author: Steven Frick, MD; March 20041st Revision: Steven Frick, MD; August 2006
2nd Revision: Joshua Klatt, MD; December 2010
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Anatomy Unique to Skeletally Immature Bones
• Anatomy– Epiphysis
– Physis
– Metaphysis
– Diaphysis
• Physis = growth plate
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Anatomy Unique to Skeletally Immature Bones
• Periosteum– Thicker
– More osteogenic
– Attached firmly at periphery of physes
• Bone– More porous
– More ductile
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Periosteum• Osteogenic
• More readily elevated from diaphysis and metaphysis than in adults
• Often intact on the concave (compression) side of the injury– Often helpful as a hinge for
reduction
– Promotes rapid healing
• Periosteal new bone contributes to remodeling
From: The Closed Treatment of Fractures, John Charley
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Physeal Anatomy
• Gross - secondary centers of ossification
• Histologic zones• Vascular anatomy
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Centers of Ossification
• 1° ossification center– Diaphyseal
• 2° ossification centers– Epiphyseal
– Occur at different stages of development
– Usually occurs earlier in girls than boys
source: http://training.seer.cancer.gov
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Physeal Anatomy
• Reserve zone– Matrix production
• Proliferative zone– Cellular proliferation– Longitudinal growth
• Hypertrophic zone– subdivided into
• Maturation
• Degeneration
• Provisional calcification
With permission from M. Ghert, MDMcMaster University, Hamilton, Ontario
Epiphyseal side
Metaphyseal side
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Examination of the Injured Child
• Assess location of deformity or tenderness
• Carefully assess and document specifically distal neurologic and circulatory function
• Radiographic evaluation
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Radiographic Evaluation of the Injured Child
• At least 2 orthogonal views
• Include joint above and below fracture
• Understand normal ossification patterns
• Comparison radiographs rarely needed, but can be useful in some situations
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Special Imaging
• Evaluate intra-articular involvement
– Tomograms, CT scan, MRI, arthrogram
• Identify fracture through nonossified area
– Arthrogram, MRI
• Identify occult (or stress) fractures
– Bone scan, MRI
• Assess vascularity (controversial)
– Bone scan, MRI
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Fractures common only in skeletally immature
• Physeal injuries– “weak link” = physis,
especially toward end of growth
• Buckle or Torus Fracture
• Plastic Deformation• Greenstick Fracture
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Buckle or Torus Fracture
• Compression failure• Stable• Usually at
metaphyseal / diaphyseal junction
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Plastic Deformation
• The non-reversible deformation after elastic limit surpassed (yield strength)
• Caused predominantly by slip at microcracks
• Permanent deformity can result– These do not remodel well
• Forearm, fibula common
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Greenstick Fractures
• Bending mechanism• Failure on tension side• Incomplete fracture,
plastic deformation on compression side
• May need to complete fracture to realign
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Salter - Harris Classification• Type I
– Through physis only
• Type II– Through physis & metaphysis
• Type III– Through physis & epiphysis
• Type IV– Through metaphysis, physis &
epiphysis
• Type V– Crush injury to entire physis
• Others added later by subsequent authors
Described by Robert B. Salter and W. Robert Harris in 1963.
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Salter Harris Classification General Treatment Principles
• Type I & Type II– Closed reduction &
immobilization
– Exceptions• Proximal femur
• Distal femur
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Salter Harris Classification General Treatment Principles
• Type III & IV– Intra-articular and
physeal step-off needs anatomic reduction
– ORIF, if necessary
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Physeal Fractures
• Traditionally believed to occur primarily through zone of hypertrophy
• Recent studies show fractures often traverse more than one zone
• Growth disturbance/arrest potentially related to – Location of fracture within physeal zones
– Disruption of vascularity
Jaramillo et al, Radiology, 2000.Johnson et al, Vet Surg, 2004.Kleinman & Marks, Am J Roentgenol, 1996.
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Fracture Treatment in Children General Principles
• Children heal faster (factors)– Age
– Mechanism of injury
– Fracture location
– Initial displacement
– Open vs. closed injury
• Growing bones remodel more readily• Need less immobilization time• Stiffness of adjacent joints less likely
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Treatment Principles
• When possible, restore:– Length, alignment & rotation
• Maintain residual angulation as small as possible using closed treatment methods– molded casts, cast changes, cast wedging, etc.
• Displaced intra-articular fractures will not remodel– anatomic reduction mandatory
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Treatment PrinciplesClosed Methods
• Achieve adequate pain control and relaxation– Anesthesia
• Local
• Regional
• General
– Conscious sedation (often combination of drugs)• Propofol
• Ketamine
• Benzodiazepines
• Narcotics
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Treatment PrinciplesClosed Methods
• Vast majority of pediatric fractures treated by closed methods. – Exceptions - open fractures, intra-articular
fractures, multi-trauma
• Attempt to restore alignment (do not always rely on remodeling)
• Gentle reduction of physeal injuries (adequate relaxation, traction)
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Treatment PrinciplesClosed Methods
• Well molded casts/splints– Use 3-point fixation principle
• Consider immobilization method on day of injury that will last through entire course of treatment– Limit splint or cast changes
• Consider likelihood of post-reduction swelling– Cast splitting or splint
• If fracture is unstable, repeat radiographs at weekly intervals to document maintenance of acceptable position until early bone healing
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Excellent reduction maintained with thin, well-molded cast/splint
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Fiberglass cast applied with proper technique and split/spread is excellent way to safely immobilize limb, maintain reduction and
accommodate swelling
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Treatment PrinciplesLoss of Reduction
• Metaphyseal/diaphyseal fractures can be remanipulated with appropriate anesthesia/analgesia up to 3 weeks after injury
• In general, do not remanipulate physeal fractures after 5-7 days– increased risk of physeal damage
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Treatment PrinciplesOpen Methods
• Respect and protect physis
• Adequate visualization– resect periosteum, metaphyseal bone, if needed
• Keep fixation in metaphysis / epiphysis if possible when much growth potential remains– Use smooth K-wires if need to cross physis
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ORIF Salter IVDistal Tibia
* Note epiphyseal/metaphyseal wires to track postoperative growth
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Complications of Fractures- Bone -
• Malunion• Limb length
discrepancy• Physeal arrest• Nonunion (rare)• Crossunion• Osteonecrosis
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Complications of Fractures- Soft Tissue -
• Vascular Injury– Especially elbow/knee
• Neurologic Injury– Usually neuropraxia
• Compartment Syndrome– Especially leg/forearm
• Cast sores/pressure ulcers• Cast burns
– Use care with cast saw
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Complications of Fractures- Cast Syndrome -
• Patient in spica/body cast
• Acute gastric distension, vomiting
• Possibly mechanical obstruction of duodenum by superior mesenteric artery
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Location Specific Pediatric Fracture Complications
Complication Fracture
Cubitus varus Supracondylar humerus fracture
Volkmann’s ischemic contracture Supracondylar humerus fracture
Refracture Femur fractureMid-diaphyseal radius/ulna fractures
Overgrowth Femur fracture (especially < 5 years)
Nonunion Lateral humeral condyle fracture
Osteonecrosis Femoral neck fractureTalus fracture
Progressive valgus Proximal tibia fractures
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Remodeling of Children’s Fractures
• Occurs by physeal & periosteal growth changes
• Greater in younger children
• Greater if near a rapidly growing physis
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Treatment Principles Immobilization Time
• In general, physeal injuries heal in half the time it takes for nonphyseal fracture in the same region
• Healing time dependent on fracture location, displacement
• Stiffness from immobilization rare, thus err towards more time in cast if in doubt
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Remodeling of Children’s Fractures
• Not as reliable for:– Midshaft angulation– Older children– Large angulation (>20-30º)
• Will not remodel for:– Rotational deformity– Intraarticular deformity
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Remodeling more likely if:
• 2 years or more growth remaining
• Fractures near end of bone
• Angulation in plane of movement of adjacent joint
10 weeks post-injury1 week post-injury
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Healing Salter I Distal Tibia Fracture
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Growth Arrest Secondary to Physeal Injury
• Complete cessation of longitudinal growth– leads to limb length
discrepancy
• Partial cessation of longitudinal growth– angular deformity, if
peripheral
– progressive shortening, if central
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Physes Susceptible to Growth Arrest
• Large cross sectional area
• Large growth potential• Complex geometric
anatomy• Distal femur > distal
tibia, proximal tibia > distal radius
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Growth Arrest Lines
• Transverse lines of Park- Harris Lines
• Occur after fracture/stress• Result from temporary
slowdown of normal longitudinal growth
• Thickened osseous plate in metaphysis
• Should parallel physis
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Growth Arrest Lines
• Appear 6-12 weeks after fracture
• Look for them in follow-up radiographs after fracture
• If parallel physis - no growth disruption
• If angled or point to physis - suspect bar
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Physeal Bar- Imaging -
• Scanogram / Orthoroentgenogram
• Tomograms/CT scans• MRI• Map bar to determine
location and extent
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Physeal Bars- Types -
• I - peripheral, angular deformity
• II - central, tented physis, shortening
• III - combined/complete - shortening
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Physeal Bar - Treatment -
• Address – Angular deformity
– Limb length discrepancy
• Assess– Growth remaining
– Amount of physis involved
– Degree of angular deformity
– Projected LLD at maturity
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Physeal Bar Resection- Indications -
• >2 years remaining growth
• <50% physeal involvement (cross-sectional)
• Concomitant osteotomy for >15-20º deformity
• Completion epiphyseodesis and contralateral epiphyseodesis may be more reliable in older child
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Physeal Bar Resection - Techniques
• Direct visualization• Burr/currettes• Interpositional
material (fat, cranioplast) to prevent reformation
• Wire markers to document future growth
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Epiphysis or Apophysis?
• Epiphysis - forces are compressive on physeal plate
• Apophysis - forces are tensile
• Histologically distinct– Apophysis has less
proliferating cartilage and more fibrocollagen to help resist tensile forces
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Apophyseal Injuries
• Tibial tubercle• Medial Epicondyle
– Often associated with dislocation
• May be preceded by chronic injury/reparative processes
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Pathologic Fractures
• Diagnostic workup important– Local bone lesion
– Generalized bone weakness
• Prognosis dependent on biology of lesion
• Often need surgery
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Polyostotic Fibrous Dysplasia
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Open FracturesPrinciples
• IV antibiotics, tetanus prophylaxis
• Emergent irrigation & debridement– Ideally within 6-8
hours of injury
• Skeletal stabilization• Soft tissue coverage
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Chronic Osteomyelitis following Open Femur Fracture
• Extremely rare in children
• Serial debridement
• Followed by simultaneous bone graft and soft tissue coverage
Monsivais, J South Orthop Assoc, 1996.
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Lawnmower Injuries• Common cause of open
fractures & amputations in children
• Most are– A rider or bystander (70%)
– Under 5 years old (78%)
• High complication rate– Infection
– Growth arrest
– Amputation
• > 50% poor results
Loder, JBJS-Am, 2004
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Lawnmower Injuries – often Result in Amputations
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Lawnmower Injuries
• Education/ Prevention key
• Children < 14 y– Shouldn’t operate– Keep out of yard
• No riders other than mower operator
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Overuse Injuries
• More common as children and adolescents participate in high level athletics
• Soccer, dance, baseball, gymnastics
• Ask about training regimens
• Mechanical pain
Femoral stress fracture
Heyworth, Curr Opin Pediatr, 2008.
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Overuse Injuries
• Diagnosis– History/Exam– Serial radiographs– Bone scan– CT/MRI
• Treatment– Abstinence from
sport/activity– Cast if child is overly active– Spica/Fixation for all
femoral neck stress fxs
Femoral stress fracture
Heyworth, Curr Opin Pediatr, 2008.
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Femoral Shaft Stress Fracture in12 year old Male Runner
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Metal Removal in Children
• Controversial
• Historically recommended if significant growth remaining
• Indications evolving
• Intramedullary devices and plates /screws around hip still removed by many in young patients
Kim, Injury 2005.Peterson, J Pediatr Orthop, 2005.
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Summary
• Pediatric musculoskeletal injuries are relatively common
• General orthopaedic surgeons can treat majority of fractures
• Remember pediatric musculoskeletal differences
• Most fractures heal, regardless of treatment
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Summary
• Most important factors: – Patient age
– Mechanism of injury
– Associated injuries• Good results – possible with all types treatment• Trend for more invasive treatment• Must use good clinical judgment and good
technique to get good results
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Bibliography• Salter R, Harris WR: Injuries Involving the Epiphyseal Plate. J Bone Joint
Surg Am. 1963;45:587-622.
• Jaramillo D, Kammen B, Shapiro F: Cartilaginous path of physeal fracture-separations: evaluation with MR imaging--an experimental study with histologic correlation in rabbits. Radiology 2000;215:504-11.
• Johnson J, Johnson A, Eurell J: Histological appearance of naturally occurring canine physeal fractures. Vet Surg 1994;23:81-6.
• Kleinman & Marks: A regional approach to the classic metaphyseal lesion in abused infants: the proximal humerus. Am J Roentgenol 1996;167:1399-403.
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