Authors: Drs. Paul Cohen and Shihab Ali
A healthy 21-year-old female presents to the ED following a motor vehicle crash. She was the restrained passenger in a head-on collision at approximately 30 mph. Her only complaint is left knee pain. On exam, her left knee is tender over the anterior aspect with moderate swelling and ecchymosis. Her ligamentous exam is limited by pain, but there is no gross laxity. Neurovascular exam is normal, and the remainder of her trauma survey is unremarkable. Plain films are obtained:
What are the pertinent radiographic findings?
Lipohemarthrosis is a layering of fat and blood that is indicative of an intra-articular fracture. Blood and fat from bone marrow escape into the joint space and layer on a horizontal cross-table view because they are different densities. Close inspection also reveals a subtle depression of the lateral tibial condyle consistent with a tibial plateau fracture.
The diagnosis of a minimally depressed lateral tibial plateau fracture (type III) was made. The patient was evaluated by orthopedics in the ED and discharged home in a knee immobilizer with orthopedic follow-up in 2 days.
An active, independent 72-year-old female presents with left leg pain after a mechanical fall at home. She fell down multiple stairs onto a wooden floor. Her exam is notable for swelling and tenderness of the left knee with a normal neurovascular exam. An AP radiograph of the knee is shown below.
What is the diagnosis? How should this injury be managed?
A minimally displaced lateral split tibial plateau fracture is depicted on radiographs. This injury is classified as a Schatzker type I fracture and is amenable to nonoperative treatment.
Orthopedic surgery was consulted. The patient was placed in a knee immobilizer and admitted. Given the minimal displacement of the fracture, she was managed nonoperatively. No weight-bearing was recommended and she was discharged to a skilled nursing facility with orthopedic follow-up in one week.
Overview of Tibial Plateau Fractures:
- Most common mechanism = axial loading
- Bimodal distribution:
o Young adults → high-energy trauma (MVC, fall from height)
o Elderly → low-energy compression force to osteoporotic bone
- Majority involve lateral tibial plateau
- Popliteal artery injury (artery is tethered both proximally and distally at the knee) → any intra-articular disruption can cause vascular injury
- Displacement of the lateral tibial condyle can cause peroneal nerve injury → assess for foot drop!
- Concomitant soft tissue injuries are common (e.g., ligaments, meniscus)
o Ligamentous injury occurs in up to 66% of patients → accurate exam limited on initial presentation due to pain, so follow-up examinations are essential
- High risk for compartment syndrome!
- AP and lateral radiographs for initial imaging
o Lipohemarthrosis suggests occult fracture in the appropriate clinical setting
- CT is useful for:
o Diagnosing occult fracture not evident on plain radiographs
o Improved characterization of fractures
o Identification of articular depression which may alter management in up to 25% of cases
o Operative planning
- MRI shows concomitant soft tissue injury but is rarely indicated in the ED
- Ice and elevate!
- Schatzker IV injuries are associated with high risk of popliteal injury → consider ABIs and/or vascular imaging (i.e. CTA)
- Nonoperative management with a hinged knee brace and protected weight bearing is indicated for:
o Minimally displaced split or depressed fractures
o Nonambulatory patients
- Surgical management is common for tibial plateau fractures, especially:
o Segment depression > 5mm
o Condylar widening > 6mm
o Schatzker type ≥ IV
- Orthopedic consultation is recommended
Take Home Points:
- Tibial plateau fractures are often complex injuries with associated ligament and meniscal disruption
- Clinical suspicion for occult tibial plateau fracture (i.e., mechanism, age, effusion) warrants CT imaging in the ED
- Maintain vigilance for neurovascular injury and recognize risk for compartment syndrome
- Patients with minimally displaced split or depressed fractures can often be discharged in a knee immobilizer as long with close orthopedic follow up assuming adherence to strict non-weight-bearing and adequate pain control
- More complex fractures often require admission for operative management
- Consult orthopedics
Faculty Reviewer: Jeffrey P. Feden, M.D.
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