Imaging Studies
Radiography
Perform radiographs of the knee, tibia/fibula, and ankle as indicated (see the image below). Pedestrians struck by motor vehicles with lower extremity fractures have a high incidence of concomitant spine, chest, or intra-abdominal injuries. [17] These patients may need additional radiographic tests to rule out these injuries when clinically indicated.
Radiograph demonstrating a displaced tibial shaft fracture with associated fibula fracture.
Computed tomography
Computed tomography is indicated for severely injured patients if unable to get diagnostically sufficient radiographs of the knee. [18, 19]
In patients with tibial plateau fractures and tibial plafond fractures, computed tomography can help further evaluate the extent of the fracture. In a study of CT evaluation of characteristics of tibial plateau fractures, diagnostic accuracy of fracture characteristics ranged from 70 to 89% for (1) a posteromedial component, (2) a lateral component, (3) a tibial tubercle component, and (4) a tibial spine (central) component. [20]
See the CT images of tibial plateau fractures below.
Tibial plateau fractures. CT image through the tibial plateau shows a fracture of the posterior aspect of the lateral tibial plateau, which is the source of the lipohemarthrosis.
Tibial plateau fractures. Coronal reformatted CT. This image demonstrates a bicondylar fracture of the tibial plateau along with a fracture of the tibial diaphysis, a Schatzker VI fracture. Note the articular incongruity.
In tibial plateau fractures, radiographs may underestimate the degree of articular depression when compared with computed tomography. This is important because articular depression of greater than 3 mm may be considered for surgery.
For stress fractures
Radiographic findings are usually seen after 2-8 weeks of symptoms, and radiographs may not be very sensitive during the early stages of symptoms.
Radionucleotide scanning and MRI are more sensitive in diagnosing stress fractures and stress injuries than radiographs.
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Shown is an intra-articular fracture of the medial condyle of the tibial plateau.
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Standard anteroposterior radiograph of a tibial shaft fracture with intramedullary nail fixation. Note the commonly associated fibular fracture that is also apparent.
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Radiograph demonstrating a displaced tibial shaft fracture with associated fibula fracture.
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Type II tibial plateau fracture in a young active adult with good bone stock treated with percutaneous elevation and cannulated cancellous screw fixation without bone grafting.
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Type III tibial plateau fracture with central depression in an elderly person treated surgically using percutaneous elevation, bone grafting, and cancellous screw fixation.
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Tibial plateau fractures. Line drawings of Schatzker types I, II, and III tibial plateau fractures. Type I consists of a wedge fracture of the lateral tibial plateau, produced by low-force injuries. Type II combines the wedge fracture of the lateral plateau with depression of the lateral plateau. Type III fractures are classified as those with depression of the lateral plateau but no associated wedge fracture.
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Tibial plateau fractures. Line drawings of Schatzker types IV, V, and VI tibial plateau fractures. Type IV is similar to type I fracture, except that it involves the medial tibial plateau as opposed to the lateral plateau. Greater force is required to produce this type of injury. Type V fractures are termed bicondylar and demonstrate wedge fractures of both the medial and lateral tibial plateaus. Finally, type VI fractures consist of a type V fracture along with a fracture of the underlying diaphysis and/or metaphysis.
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Tibial plateau fractures. CT image through the tibial plateau shows a fracture of the posterior aspect of the lateral tibial plateau, which is the source of the lipohemarthrosis.
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Tibial plateau fractures. Axial CT image through the tibial shows a fracture through the lateral tibial plateau with slight diastasis between the fragments. This is a Schatzker II injury.
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Tibial plateau fractures. Coronal reformatted CT. This image demonstrates a bicondylar fracture of the tibial plateau along with a fracture of the tibial diaphysis, a Schatzker VI fracture. Note the articular incongruity.
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Classification of tibial tuberosity fractures.
