avoiding complications in acetabular and pelvic fractures cme/brochures/avoiding...short term...
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Avoiding Complications in Acetabular and Pelvic fractures
Kenneth Graf, MD
Director of Orthopedic Trauma
Cooper University Health Systems
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Acetabular fractures
Epidemiology:
Bimodal distribution: high energy often in young patients
Low energy in elderly patients
Lower extremity injury most common associated injury- 36%
80% hip survival with well treated acetabular fracture
Male >Female, ? anatomy
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Acetabulum anatomy
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CT differentiation
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Acetabular Fractures
Risk factors for poor outcome:
NON ANATOMICAL REDUCTION (2mm)
Age >40yo. Risk for poor outcome increases directly wit age
Posterior fracture patterns and associated fracture patterns – transverse-posterior wall the worst outcomes of letournel classifications
Delayed hip reduction > 12 hours
Femoral head injury
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Post Traumatic Arthritis
Directly related to quality of reduction-89% excellent to good with anatomic reduction
53% poor outcomes with poor reduction
Highest risk with transverse posterior wall
Elderly highest risk for loss of reduction
Articular injury to femoral head-hip cannot be salvaged by anatomical reduction of acetabulum
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Treatment Goals
1. Multiple studies confirm best predictor of successful treatment of acetabular fractures is obtaining and maintaining a quality reduction
<2mm= 13% post traumatic arthrosis
>2mm= 43% post traumatic arthrosis
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Improving reduction
Time to ORIF- sooner is better
Better reductions with quicker time to OR. Decrease nosocomial contamination and infection rates
Prone vs lateral- no difference proven, possible higher infection rate with prone but prone used on more complex cases
Better results with more experience
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Combined
20 yo male MVC ejected driver Classification?
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Combined
Dual approach chosen
Anterior approch with orif SI joint first
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Combined
Post op ct before second- posterior approach
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Combined
9month follow up
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Elderly
80yo low energy fall on hip at class reunion
History of prostate cancer with open prostetectomy
Beware elderly male with prostate issues/ASA
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Elderly
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Elderly- not difficult to obtain reduction, difficult to maintain reduction Unable to perform medial
stoppa window secondary to previous surgery
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Elderly
Patient with late avn, and residual protrusio
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Elderly
Conversion to tha
Largest risk is acetabular component
May need cement for osteopenia
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Avascular Necrosis
Letournel “Femoral head necrosis is nearly impossible to prevent”
Proven reduction after 12 hours of hip dislocation is higher risk of avn
Need concentric reduction
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Avascular Necrosis
Felt to be die cast at time of injury
Surgical contributions to risk:
incision of piriformis or conjoined tendon less than 1.5 cm from femoral insertion can injure blood supply
Avoid excessive stripping of blood supply to wall fragments
Complete tear of piriformis or obturator has high association with late avn
Can occur up to 2 yrs from injury
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Avascular Necrosis
Posterior fracture patterns: 18-20%
Overall: 6-8%
Higher risk with posterior wall exiting into subchondral arc
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AVN
42 yo in mvc
Pulmonary contusion, and transverse posterior wall acetabular fracture
Post “reduction” ap pelvis
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AVN
Corresponding post “reduction” CT
Now 14 hours post injury
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AVN
Reduction in OR 20 hours post injury
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AVN
Anatomical reduction obtained of acetabular fracture
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AVN
Doing well, returned to work,until developed AVN 9 months post injury
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Dislocation- AVN prevention
One shot at reduction of native hip
If irreducible needs to be taken straight to or with preparations for orif
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Dislocation- AVN prevention
30 yo injured playing soccer Patient transferred with no reduction attemps for osh
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Dislocation- AVN prevention
Pt treated with orif after successful closed reduction
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Nerve injury
German pelvic registry:
4.5% acetabular patients with nerve injury at presentation
8% nerve injury at discharge
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Nerve Injury
Giannaudi: 13 pts with foot drop at presentation.
Only 2/13 improved at 5 yr f/u
0% if emg showed concomitant slowing at knee
Beware ICU palsy: prolonged postioning on peroneal nerve
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Pt developed foot drop between staged surgery
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Intra-articular hardware (schutter)
Archdeacon 2015:
2.5% of all post op CT ”benefitted” from study
1% IA hardware, .7% fragment, .5% malreduction, .3% combined
? Risk/ benefit
Moed: post op ct of posterior wall correlates with outcomes
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Nonunion
Rare in acetabular fracture: must r/o occult infection
Highest risk with 4.5 mm plating
Case: 21 yo female pedestrian struct treated with ORIF acetabulum in Kenya
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Case- nonunion/IA harware
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Case- nonunion/IA hardware
5 year follow up with hip salvage
Full activitie
Mild arthrosis
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Heterotopic Ossification
Brooker classification:
I bone islands
II: 1 cm separation
III: less than 1cm separation
IV: fused/bridged
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Heterotopic Ossification
Risk Factors:
Prolonged mechanical ventilation, Head injury, males, African American, extensile approach
Symptomatic HO 10% kocher
42% extensile
14% combined
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Heterotopic Ossification
Must debride all necrotic gluteus minimus
CORR 2016 davis JA
Decreased HO with irradiation only-preferred over Indocin
Sagi 2014 JOT
Higher indcidence of posterior wall symptomatic nonunion with Indocin, no effect of HO
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Heterotopic Ossification
Karunakar et al: no diff Indocin vs placebo
Indocin associated with higher risk long bone nonunion
Radiation- 700cGy 72 hrs post or 4 hrs prior
Low risk of late sarcoma conversion- case report 11 yrs out chondroblastic osteosarcoma. Felt to be higher risk with second dose
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Heterotopic ossification (DPF WH)
COX 2 inhibitor encouraging data in THA population/military
Need more studies on acetabular fracture patients
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Infection
Deep infection rate is 5-8% in multiple studies
Risk factors:
Longer OR times (3 hours)
Increase time from admission to surgery
Higher blood loss higher BMI
Prolonged ICU stay
Abdominal injury
Morel lesion
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Infection
Prone positioning?
Nutritional contribution poorly studied
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Infection
20 yo multiply injured patient in mcc. Hemodynamically unstable. Prolonged wait for surgery
Prone approach
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Infection
Severe chondral injury
Good reduction obtained
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Infection
Abx spacer placed
Pseudomonas
Removal of spacer and culturing prior to tha
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Infection
Successful conversion to THA
5 years out
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Pelvic Fractures ( new pt)
Epidemiology:
High Energy: 50% mortality open fracture- minimal change over years
LC- head/chest injury association
APC- Abdominal
>80% hemodynamic instability pts associated with venous bleeding
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Pelvic Fractures
High Energy:
60% chest I njury
50% sexual disfunction
50% long bone fx
Risk factors for poor outcome:
SI jt > 1 cm
LL discrepancy >2cm
Neurologic injury
Initial resuscitation critical in high energy:
Binder or sheet for open book
Traction for vertical shear
TEG algorhythm replacing 1:!:!
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Pelvic Fracture
Beware CT in binder
Avoid binder on LC injury- risk arterial injury in elderly
Resuscitation SI screws replacing c clamp for posterior injury/instability
Case- SI jt diastasis righ, left bicolumn acet fx, hit by forklift
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Binder properly placed over greater trochanters NOT iliac wings
Effective for APC tamonade, not for LC injuries
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Pelvic Fracture
Algorhythm:
ABC
Temporary stabilization
Resuscitation
If not response: angio
If negative: or for ex fix vs si screws
Recent case- unresponsive to angio, si screws used with anterior column and left acetabular reduction/traction
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Pelvic Fracture
Surgical indications:
Complete/displaced dennis 2/3
Most U types
APC>2.5cm wide
Indications expanding as percutaneous techniques have evolved, especially in elderly
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CT scan critical for sacral evaluation. Verical shear pelvis treated with traction followed by orif and transiliac screws(significantly stronger fixation)
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Pediatric Pelvic Fractures
Most commonly involve iliac wing and ramus
Most non operative
Need to treat similar to adults- unstable vertically/rotationally unstable may need surgical intervention
6 yo pedestrian struck with rotationally and vertically unstable apc injury
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Pediatric Pelvic Fracture
Grossly unstable left hemipelvis
Poor outcomes untreated
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Pediatric Pelvis
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Hardware complications
Most common percutaneous failure is retrograde ramus screw unicortical
No benefit to neuro monitoring with screw placement
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Hardware complications
Complete unstable dennis 2 sacral fractures with bilateral displaced rami fractures- high risk of late deformity
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Severe sacral dysmorphism S1
S2 corridor safest
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Hardware complications
Patient with significant nejuropathic pain post op
Motor intact
CT obtained
Concern for posterior screw placement
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Hardware complications- S2 canal placement
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Hardware complications
Revsion scfre and anterior ring stabilization
Symptoms immediately resolved
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Urogenital
20% of all pelvic fractures with urogenital injury
Higher in Male and APC injury
Blood at meatus mandates retrograde urethrogram
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Elderly Pelvic Fracture
>60yo much more likely to have arterial injury
Displaced LC injury binder can worsen or cause arterial injury
Earlier angio
Surgical indications expanding
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Elderly Pelvic Fracture
7% of all fractures >65yo
Much higher incidence of U/H type fracture
All anterior ring injuries get CT pelvis- difficult to delinieate on plain radiograph
Hospital stays avg 9-43 days world wide
OTB c/s- forteo encouraging results in Europe
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Elderly Pelvic Fracture
Short term results of complete LC1 pelvic fractures in elderly:
Giannoudis: all pts with complete sacral fractures and sup/inferior ramus taken to or for stress testing
>2cm considered positive and treated with si screws and anterior fixation. Those fixed showed significantly less pain meds, significantly decrease hosp stay and quicker pain free ambulation
? Role of fixation in stable patterns
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Elderly Pelvic Fractures
Protocol:
Patients with LC1 fracture pattern deemed stable radiographically should be able to mobilize within 3 days with protected wb.
Patients unable to mobilize- consider surgical treatment/ EUA
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U type
Most commonly missed elderly pelvic fracture
Can lead to severe disability/loss
of ambulation/chronic pain
Most common mechanism: fall on buttocks
Paradoxical inlet/ct sagittal Bilateral sacral fractures-
paradoxical inlet
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U-type classification
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Dennis classification
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Utype- Case
70 yo female who fell at home after revision hemi hip
Self referred to clinic with inablility to walk for 2 weeks and bilateral foot drop
No diagnosis made following multiple xrays of hip
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U-type case
Transiliac S1 screws placed for insitu fixation
Immediate wt bearing
Full return of nerve function at 6 months