د. رائد كساب. pediatric forearm fractures- radial and ulnar shafts approximately 4% of...
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كساب. رائد د
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Pediatric Forearm Fractures- Radial and Ulnar Shafts
Approximately 4% of children’s fractures
Middle and proximal radius more protected by
musculature than distal
Ulna subcutaneous and susceptible to trauma when
raised for self protection
Most fractures are from fall on an outstretched arm
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EPIDEMIOLOGY
These injuries are very common: They make up 40% of all pediatric fractures (only 4% are diaphyseal fractures), with a 3/1 male predominance in distal radius fractures.
80% occur in children >5 years of age.The peak incidence corresponds to the peak velocity of
growth when the bone is weakest owing to a dissociation between bone growth and mineralization.
15% have ipsilateral supracondylar fracture.1% have neurologic injury, most commonly median
nerve.Of pediatric forearm fractures, 60% occur in the distal
metaphyses of the radius or ulna, 20% in the shaft, 14% in the distal physis, and <4% in the proximal third
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Forearm Developmental Anatomy
Primary ossification centers at 8 weeks gestation
in both radius and ulna
Distal physes provide most of longitudinal growth
Distal epiphyses of radius appears
radiographically at age 1, of distal ulna at age 5
Proximal and middle radius connected to ulna by
intraosseous membrane
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The radial and ulnar shafts ossify during the eighth week of
gestation.
The distal radial epiphysis appears at age 1 year (often from
two centers); the distal ulnar epiphysis appears at age 5
years; the radial head appears at age 5 to 7 years; the
olecranon appears at age 9 to 10 years. These all close
between the ages of 16 and 18 years.
The distal physis accounts for 80% of forearm growth.
With advancing skeletal age, there is a tendency for
fractures to occur in an increasingly distal location owing to
the distal recession of the transition between the more
vulnerable wider metaphysis and the more narrow and
stronger diaphysis.
Forearm Developmental Anatomy
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Osteology
The radius is a curved bone, cylindric in the proximal third, triangular in the middle third, and flat distally with an apex lateral bow.
The ulna has a triangular shape throughout, with an apex posterior bow in the proximal third..
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Osteology
The proximal radioulnar joint is most stable in supination where the broadest part of the radial head contacts the radial notch of the ulna and the interosseous membrane is most taut. The annular ligament is its major soft tissue stabilizer.
The distal radioulnar joint (DRUJ) is stabilized by the ulnar collateral ligament, the anterior and posterior radioulnar ligaments, and the pronator quadratus muscle. Three percent of distal radius fractures have concomitant DRUJ disruption.
The periosteum is very strong and thick in the child. It is generally disrupted on the convex fracture side, whereas an intact hinge remains on the concave side. This is an important consideration when attempting closed reduction.
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Biomechanics The posterior distal radioulnar ligament is taut in pronation,
whereas the anterior ligament is taut in supination.The radius effectively shortens with pronation and lengthens
with supination.The interosseous space is narrowest in pronation and widest
in neutral to 30 degrees of supination. Further supination or pronation relaxes the membrane.
The average range of pronation/supination is 90/90 degrees (50/50 degrees necessary for activities of daily living).
Middle third deformity has a greater effect on supination, with the distal third affecting pronation to a greater degree.
Malreduction of 10 degrees in the middle third limits rotation by 20 to 30 degrees.
Bayonet apposition (overlapping) does not reduce forearm rotation
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Deforming Muscle Forces
Brachioradialis: Dorsiflexes and radially deviates the distal segment.
Pronator quadratus, wrist flexors and extensors, and thumb abductors: They also cause fracture deformity.
Proximal third fractures :Biceps and supinator: These function
to flex and supinate the proximal fragment.
Pronator teres and pronator quadratus: These pronate the distal fragment.Middle third
fractures:Supinator, biceps, and pronator teres: The proximal fragment is in neutral.
Pronator quadratus: Pronates the distal fragment.
Distal third fractures:
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Mechanism of injury
Direct trauma to the radial or ulnar shaft.
Indirect: The mechanism is a fall onto an outstretched hand. Forearm rotation determines the direction of angulation
Pronation: flexion injury (dorsal angulation)
Supination: extension injury (volar angulation)
Direct:
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Clinical evaluation
The patient typically presents with pain, swelling, variable
gross deformity, and a refusal to use the injured upper
extremity.
A careful neurovascular examination is essential. Injuries to
the wrist may be accompanied by symptoms of carpal tunnel
compression.
The ipsilateral hand, wrist, forearm, and arm should be
palpated, with examination of the ipsilateral elbow and
shoulder to rule out associated fractures or dislocations.
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Clinical evaluation In cases of dramatic swelling of the forearm, compartment
syndrome should be ruled out on the basis of serial
neurovascular examinations with compartment pressure
monitoring if indicated. Pain on passive extension of the
digits is most sensitive for recognition of a possible
developing compartment syndrome; the presence of any of
the classic signs of compartment syndrome (pain out of
proportion to injury, pallor, paresthesias, pulselessness,
paralysis) should be aggressively evaluated with possible
forearm fasciotomy.
Examination of skin integrity must be performed, with
removal of all bandages and splints placed in the field.
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Radiographic evaluation Anteroposterior and lateral views of forearm, wrist, and
elbow should be obtained. The forearm should not be rotated to obtain these views; instead, the beam should be rotated to obtain a cross-table view.
In the normal, uninjured radius, the bicipital tuberosity is 180% to the radial styloid
Ninety degrees of supination: It is directed medially.
Neutral: It is directed posteriorly. Ninety degrees of pronation: This is
directed laterally.
The bicipital tuberosity is the landmark for identifying the rotational position of the proximal fragment :
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Remodeling Potential – Variables to Consider
Age
Distance from fracture to physis
Proximal forearm fractures less forgiving
Amount of deformity
Direction of angulation
Rotational deformities will not remodel
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Goals of Treatment
Regain full forearm rotation
Restore alignment and clinical appearance
50 degrees supination, 50 degrees pronation
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Nonoperative Treatment
Gross deformity should be corrected on presentation to
limit injury to soft tissues. The extremity should be
splinted for pain relief and for prevention of further
injury if closed reduction will be delayed.
The extent and type of fracture and the child age
are factors that determine whether reduction can
be carried out with sedation, local anesthesia, or
general anesthesia.
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Nonoperative Treatment
Closed reduction and application
of a well-molded (both three-
point and interosseous molds)
long arm cast or splint should be
performed for most fractures,
unless the fracture is open,
unstable, irreducible, or
associated with compartment
syndrome.
Finger traps may be applied
with weights to aid in
reduction.
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Nonoperative Treatment Exaggeration of the deformity (often >90 degrees) should
be performed to disengage the fragments. The angulated distal fragment may then be apposed onto the end of the proximal fragment, with simultaneous correction of rotation.
Reduction should be maintained with pressure on the side of the intact periosteum (concave side).
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Excellent Reduction with Well Molded Cast
Nonoperative Treatment
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Nonoperative Treatment
The arm should be elevated The cast should be
maintained for 4 to 6 weeks until radiographic evidence
of union has occurred. Conversion to a short arm cast
may be undertaken at 3 to 4 weeks if healing is adequate
Because of deforming muscle forces, the level of the fracture determines forearm rotation of immobilization:Proximal third fractures:
supinationMiddle third fractures: neutralDistal third fractures: pronation
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Acceptable deformity: Angular deformities: Correction of 1 degree per
month, or 10 degrees per year results from physeal growth. Exponential correction occurs over time; therefore, increased correction occurs for greater deformities.
Rotational deformities: These do not appreciably correct.
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Acceptable deformity: Bayonet apposition: A deformity
1 cm is acceptable and will remodel if the patient is <8 to 10 years old.
In patients >10 years of age, no deformity should be accepted.
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Nonoperative Treatment
Any plastic deformation should be corrected that :
prevents reduction of a concomitant fracture,
prevents full rotation in a child >4 years,
exceeds 20 degrees
Plastic deformation:
Children <4 years or with
deformities <20 degrees usually
remodel and can be treated with
a long arm cast for 4 to 6 weeks
until the fracture site is
nontender.
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Nonoperative Treatment
The correction should have less than 10 to 20 degrees of angulation
General anesthesia is typically necessary, because forces
of 20 to 30 kg are usually required for correction
The apex of the bow
should be placed over a
well-padded wedge,
with application of a
constant force for 2 to
3 minutes followed by
application of a well-
molded long arm cast.
Plastic deformation:
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Nonoperative Treatment
Nondisplaced or minimally displaced fractures may be immobilized in a well-molded long arm cast. They should be slightly overcorrected to prevent recurrence of deformity.
Completing the fracture decreases the risk of recurrence of the deformity; however, reduction of the displaced fracture may be more difficult. Therefore, it may be beneficial to carefully fracture the intact cortex while preventing displacement. A well-molded long arm cast should then be applied.
Greenstick fractures:
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After Closed Reduction and Casting
Weekly radiographs for 3 weeks to confirm acceptable
alignment and rotation
overriding (bayonette) position OK
Can remanipulate up to 3 weeks after injury for shaft
fractures
Angular deformity exceeding 10 degrees in child older
than 8 years- consider remanipulation
Nonoperative Treatment
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Operative Indications
Unstable/unacceptable fracture reduction after closed
reduction
Open fracture/compartment syndrome
Floating elbow
Refracture with displacement
Segmental fracture
Neurologic/vascular compromise
Age (girls >14 years old, boys >15 years old)
Surgical stabilization of pediatric forearm fractures is
required in 1.5% to 31% of cases.
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Implant Choice for Pediatric Forearm Fractures
IM nails (2 mm typically) allow for stabilization with
minimal soft tissue dissection and easy removal of
implants
IM fixation usually augmented with short term above
elbow cast immobilization
Older children (10 years and above) may be better
treated as adults with plates and screws
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Operative Treatment Intramedullary fixation: Percutaneous insertion of
intramedullary rods or wires may be used for fracture stabilization. Typically, flexible rods are used or rods with inherent curvature to permit restoration of the radial bow.
The radius is reduced first, with insertion of the rod just proximal to the radial styloid after visualization of the two branches of the superficial radial nerve.
Alternate entry point just proximal to Lister's tubercle between second and third dorsal compartment
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Operative Treatment
The ulna is then reduced, with
insertion of the rod either antegrade
through the olecranon or retrograde
through the distal metaphysis, with
protection of the ulnar nerve.
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Open Both Bone Forearm Fracture
Operative Treatment
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12 Year Old- Accept Less Angulation in Older Kids
Operative Treatment
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Operative Treatment
Postoperatively, a volar splint is placed for 4 weeks. The hardware is left in place for 6 to 9 months, at which time removal may take place, provided solid callus is present across the fracture site and the fracture line is obliterated.
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Operative Treatment
Plate fixation: Severely comminuted fractures or those associated with segmental bone loss are ideal indications for plate fixation, because in these patterns rotational stability is needed. Plate fixation is also used in cases of forearm fractures in skeletally mature individuals.
Ipsilateral supracondylar fractures: When associated with forearm fractures, a floating elbow results. These may be managed by conventional pinning of the supracondylar fracture followed by plaster immobilization of the forearm fracture.
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Metal Removal
In younger children IM fixation usually removed at 3-6
months when solid healing noted on radiographs
When plates and screws used then often implants not
removed unless symptomatic
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Acceptable Angulations
Case by case decisions
Closed reduction should be attempted for angulation
greater than 20 degrees
How much to accept before proceeding with open
reduction dependent on many factors
Angulation encroaching on interosseous space may be
more likely to limit rotation
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Acceptable Angulations
We accept 100% translation if shortening is less than 1 cm. Although other authors recommend accepting up to 45 degrees of rotation
Accepted angulation is (provided the child has at least 2 years of growth remaining): 20 degrees of angulation in distal-
third shaft fractures of the radius and ulna 15 degrees at the midshaft level 10 degrees in the proximal third
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Acceptable Angulations
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ComplicationRefracture: This occurs in 5% of patients and is more
common after greenstick fractures and after plate removal.
Malunion: This is a possible complication
Synostosis: Rare complication in children. Risk factors include high-energy trauma, surgery, repeated manipulations, proximal fractures, and head injury.
Compartment syndrome:
One should always bivalve the cast after a reduction.
Nerve injury: Median, ulnar and posterior interosseous nerve (PIN) nerve injuries have all been reported. There is an 8.5% incidence of iatrogenic injury in fractures that are surgically stabilized.
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16 Year old with Rotational Malunion
in older patients operative treatment preferred to maintain functional forearm rotation
Complication
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Galeazzi Fracture- Radial Shaft Fracture with DRUJ Injury
relatively rare injuries in children
Usually at junction of middle and
distal thirds
Distal fragment typically
angulated towards ulna
Closed treatment for most
Carefully assess DRUJ post
reduction, clinically and
radiographically
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Closed Reduction
Galeazzi Fracture
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Galeazzi Equivalent
Radial shaft fracture with distal ulnar physeal injury instead of DRUJ injury
Distal ulnar physeal injuries have a high incidence for growth arrest
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12 Year Old Male Galeazzi Equivalent
Distal ulnar epiphysis
Galeazzi Equivalent
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Distal Radius Fractures
Most commonly fractured bone in children
Metaphyseal most frequent, distal radial physeal second
Simple falls most common mechanism
Rapid growth may predispose, with weaker area at
metaphysis
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Distal Radius Fractures
Metaphyseal
Physeal – Salter II most common
Torus
Greenstick
Complete - Volar angulation with
dorsal displacement of the distal
fragment most common
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Associated Injuries
Frequently distal ulnar metaphyseal fracture or ulnar
styloid avulsion
Occasionally distal ulnar physeal injury – high
incidence of growth disturbance
Median or ulnar nerve injury – rare
Acute carpal tunnel syndrome can occur, also rare
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Nondisplaced distal radius fractures treatment
Below elbow immobilization
3 weeks
Torus fractures are stable
injuries and can be treated
with a removable forearm
splint
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Displaced distal radius fractures-treatment
Closed reduction usually not difficult
Traction (reduce shear), recreate
deformity and reduce using intact
periosteal hinge
Immobilize – many different positions of
wrist and forearm rotation recommended
Well molded cast / splint, above or below
elbow surgeon preference
3-4 weeks immobilization
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Treatment Recommendations – Reduction Attempts?
“Repeated efforts at reduction do nothing more than grate the plate away.”
“These injuries unite quickly, so that attempts to correct malposition after a week are liable to do more damage to the plate than good.”
Rang, Children’s Fractures 1983.
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Treatment Recommendations - Reductions / Acceptable Alignment
No correlation between reduction attempts and growth retardation.
No correlation between post-reduction position and growth retardation.
Noted a relationship between fracture type (S-H IV) and growth arrest.
Aitken, JBJS 1935.
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Treatment Recommendations
“An attempt should be made to reduce all
displacements… however, repeated
manipulations or osteotomy are not warranted.”
“Displacement of the epiphysis does not persist. All
displacements are reduced well within a year.”
“The one case of deformity in the series is
attributed to crushing of the physis.”
Aitken, JBJS 1935.
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Treatment Recommendations
“For Salter-Harris type I and II
injuries in children younger than 10
years of age, angulation of up to 30°
can be accepted. In children older
than 10 years, up to 15° of
angulation is generally acceptable.”
Armstrong et al, Skeletal Trauma, 1998.
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Displaced Distal Radius Fractures – Care after Closed Reduction
Radiograph within one week to check reduction
Do not remanipulate physeal fractures after 5-7 days for
fear of further injuring physis
Metaphyseal fractures may be remanipulated for 2-3
weeks if alignment lost
Expect significant remodeling of any residual deformity
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Remodeling Potential- 12 years Male
Presented 10 days after fracture – no reduction, splinted in ED and now with early healing
At 6 months – extensive remodeling of deformity noted
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Remodeling Potential
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Distal Radius Fractures - Complications
Growth arrest unusual after
distal radius physeal injury
Malunion will typically
remodel – follow for one year
prior to any corrective
osteotomy
Shortening usually not a
problem – resolves with
growth
Remodeling in 8 months
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Distal Radius Fracture – Indications for Operative TreatmentInability to obtain acceptable reduction
Open fractures
Displaced intraarticular fxs
Associated soft tissue injuries
Associated fractures (SC humerus)
Associated acute carpal tunnel syndrome or
compartment syndrome
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Distal Radius – Fixation Options
Smooth K wire
fixation usually
adequate
Ex fix for severe soft
tissue injury
Some fxs amenable to
plate fixation
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Open Metadiaphyseal Fractures- I&D, Pinning
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Complications
Premature Physeal Closure / Growth Arrest
1.25% (Aitken, 1935)
3% (Bragdon, 1965)
7% (Lee, 1984)
Nerve Injury
8%
Ulnar Styloid Nonunions
27% (Aitken, 1935)
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Distal Radius Growth Arrest
Relatively rare (< 1 –
7%)
Severity of trauma
Amount of displacement
Repeated attempts at
reduction
Remanipulation or late
manipulation
Complications
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Conclusions
Most common physeal plate injury (46%)
Increased incidence of growth plate
abnormalities with 2 or more reductions
Acceptable alignment: 50% apposition
30° angulation
Accept malreduced fractures upon late
presentation (over 7 days).
Growth arrest rate up to 7%
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Carpal Injuries in Children
Unusual / Uncommon in children
Scaphoid most commonly fractured carpal bone
Capitate / Lunate / Hamate fractures also can occur
Make a habit of carefully checking carpal bones on
every wrist film
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•The age at the time of
appearance of the ossific
nucleus of the carpal bones
and distal radius and ulna.
•The ossific nucleus of the
pisiform (not shown) appears
at about 6 to 8 years of age
Carpal Injuries in Children
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Scaphoid nonunion Patient gave history of a fall sustained one year ago
with a “bad wrist sprain”
Carpal Injuries in Children
9 years old 1.5 years after After 2 months of casting, early fracture union is present
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Distal Radius and Scaphoid Fractures
Carpal Injuries in Children
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Scaphoid Fractures - Treatment
Tender snuff box – immobilize until tenderness resolves
If still tender at 1-2 weeks – repeat xray
Confirmed fracture – if nondisplaced immobilize in above
elbow cast for 6 – 8 weeks
Displaced fracture ORIF
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Hand Fractures
Metacarpal and phalangeal fractures – if displaced closed
reduction
Correct angulation and rotation
Immobilize in intrinsic plus position 3-4 weeks
Indications for ORIF – open fractures, displaced
intraarticular fractures, inability to obtain or maintain
reduction
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Hand Fractures
•The long axes of the
metacarpal and proximal
phalanx should align, as
they do in this normal
hand.•If there is a fracture in
the proximal phalanx, as
in this patient's opposite
or injured hand, the axes
will not be colinear
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Distal Phalangeal Fractures
Address any associated
nail bed injuries
If open give appropriate
antibiotics, I&D
Crush injuries
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Distal Phalangeal Fractures
Mallet finger injuries
Closed or open management
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Distal Phalangeal Fractures
Physeal injury
• Clinically resemble a mallet finger
• S-H I or II fracture
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Middle and Proximal Phalangeal Fractures
Closed management for
majority
ORIF for displaced
intraarticular fractures
Restore rotational alignment
Physeal fractures of the proximal
phalanx may be the most common
pediatric hand fracture
Extraarticular S-H II fractures are
most prevalent
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Can use pencil in
webspace trick or flex
MP to 90 and push
radially to reduce
“extra-octave”
fractures
Middle and Proximal Phalangeal Fractures
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Middle and Proximal Phalangeal Fractures
Phalangeal Neck Fractures
Closed treatment of fractures
of the phalangeal neck is
difficult because these
fractures often are unstable
and displaced
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Reduce and Fix Displaced Intraarticular Fractures
Middle and Proximal Phalangeal Fractures
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Metacarpal Fractures
Closed management for most
Accept less angulation in index
than small finger
The metacarpal neck is the
most frequent site of
metacarpal fractures in
children. (10 to 30 degrees of
angulation is acceptable)
more common in the small and
ring fingers
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Metacarpal Fractures
Metacarpal Neck Fractures
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Metacarpal Base Fractures
Metacarpal Fractures
Closed reduction and percutaneous pinning usually are sufficient
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Open Crush Injury to Hand
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Osteology The radius is a curved bone, cylindric in the proximal third, triangular in the
middle third, and flat distally with an apex lateral bow. The ulna has a triangular shape throughout, with an apex posterior bow in the
proximal third. The proximal radioulnar joint is most stable in supination where the broadest
part of the radial head contacts the radial notch of the ulna and the interosseous membrane is most taut. The annular ligament is its major soft tissue stabilizer.
The distal radioulnar joint (DRUJ) is stabilized by the ulnar collateral ligament, the anterior and posterior radioulnar ligaments, and the pronator quadratus muscle. Three percent of distal radius fractures have concomitant DRUJ disruption.
The triangular fibrocartilage complex (TFCC) has an articular disc joined by volar and dorsal radiocarpal ligaments and by ulnar collateral ligament fibers. It attaches to the distal radius at its ulnar margin, with its apex attached to the base of the ulna styloid, extending distally to the base of the fifth metacarpal.
The periosteum is very strong and thick in the child. It is generally disrupted on the convex fracture side, whereas an intact hinge remains on the concave side. This is an important consideration when attempting closed reduction.
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S/P Closed Reduction
Distal ulnar epiphysis
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Growth Arrest following Distal Radius Fracture
Injury films Injured and uninjured wrists after premature physeal closure
Complications
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Closed Reduction MethodsAdequate analgesia
/ anesthesiaTraction –
countertractionIncrease deformityReduce / lock on
fragmentsCorrect rotational
deformity
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Cast Burns- can occur during cast removal if blade dull or improper technique used
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Pediatric Forearm FracturesCompleteGreenstick fracturesBuckle or torus fracturesPlastic deformationProximal, middle or distalFxs at same levelFxs at different levelAlmost always a rotational component
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Forearm Rotation Position in Cast – Supinate, Pronate or Midposition?Depends on location
of fracture and position of distal fragment in relation to proximal
Match distal fragment to proximal – can use bicipital tuberosity as a guide, and compare diameter of bones at fx
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Maintaining ReductionAppropriately molded
cast very importantEasier to maintain an
initial excellent reduction than a marginal one
Above elbow or below elbow immobilization – surgeon preference for distal 1/3 fractures
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Indications for Open ReductionOpen fracturesInability to maintain
acceptable reductionMultiple traumaFloating elbowNeurologic/vascular
compromiseRefracture
IM fixation- little soft tissue disruption required to insert
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Forearm Fractures - ComplicationsMalunion-most
commonRefracture – 5%
within 6 monthsCompartment
syndrome – observe closely, diagnosis and treatment similar to adults
Synostosis rareNeurologic injury
uncommon
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Plastic Deformation of the ForearmFixed bending
remains when bone deformed past elastic limit
Most commonly in forearm, may be ulna or radius
Periosteum intact and thus usually no periosteal callus
Can limit rotation
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Plastic Deformation
Remodeling not as reliable
Significant curvature that produces clinical deformity should be corrected
Greater than 20 degrees, older than 8 years – reduce deformity
General anesthesiaConsiderable force,
slowly applied over a padded fulcrum
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ORIF Distal Ulna
Exposed end of metaphysis
Ulnar epiphysis
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Pin fixation ulnar epiphysis and ulna to radius pin with above elbow cast
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•This lecture is one of a series of lectures were prepared and presented by residents in the department of orthopedics in Damascus hospital, under the supervision of Dr. Bashar Mirali.
•This site is not responsible of any mistake may exist in this lecture.
كاظم. مؤيد Dr. Muayad Kadhimد