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Pauwels Classification – Femoral Neck Fracture Explained

The Pauwels classification divides femoral neck fractures into three types based on the inclination angle of the fracture line, helping doctors plan the most appropriate treatment.

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Things worth knowing about "Pauwels Classification"

The Pauwels classification divides femoral neck fractures into three types based on the inclination angle of the fracture line, helping doctors plan the most appropriate treatment.

What Is the Pauwels Classification?

The Pauwels classification is a medical grading system used to categorize femoral neck fractures – fractures of the upper part of the thigh bone (femur) in the region connecting the femoral head to the femoral shaft. It was developed by the German orthopaedic surgeon Friedrich Pauwels and first described in 1935. The system is based on the angle of the fracture line relative to the horizontal plane, and it allows physicians to predict the biomechanical forces acting on the fracture and the likelihood of successful healing.

Classification of Pauwels Types

The classification distinguishes three types according to the angle of the fracture line:

Pauwels Type I (angle up to 30°): The fracture line is nearly horizontal. Compressive forces predominate, making this type mechanically stable with a favorable prognosis for healing.
Pauwels Type II (angle between 30° and 50°): The fracture line is moderately steep. Both compressive and shear forces are present. Healing is more uncertain, and surgical stabilization is often required.
Pauwels Type III (angle greater than 50°): The fracture line is steep. Shear forces dominate, significantly impairing fracture healing and greatly increasing the risk of complications such as avascular necrosis (death of the femoral head due to disrupted blood supply). Surgical intervention is almost always necessary.

Clinical Relevance

The Pauwels classification is particularly important for treatment planning in femoral neck fractures. The higher the Pauwels type, the more unstable the fracture and the more likely surgical intervention becomes. It provides the treating physician with essential information about the biomechanical stability of the fracture and potential complication risks.

Diagnosis and Imaging

The Pauwels type is determined using conventional X-rays of the hip joint in two planes (anterior-posterior and axial). The angle of the fracture line relative to the horizontal is measured directly on the image. In ambiguous cases, a computed tomography (CT) scan may be used for more detailed assessment of the fracture geometry.

Treatment According to Pauwels Type

Conservative Treatment

In very elderly or medically frail patients, or in rare cases of Type I fractures, conservative management (restricted weight-bearing, physiotherapy) may occasionally be considered. However, this approach is uncommon and carries the risk of fracture displacement.

Surgical Treatment

The majority of femoral neck fractures are managed surgically. Depending on the Pauwels type and the age of the patient, the following procedures may be used:

Osteosynthesis (e.g., cannulated screws or dynamic hip screw, DHS): Preferred in younger patients and Type I or II fractures, aiming to preserve the native femoral head.
Hemi- or total hip arthroplasty (hip replacement): Commonly performed in elderly patients or in Type III fractures, where the prognosis for biological healing is poor and the risk of femoral head necrosis is high.

Limitations of the Classification

While the Pauwels classification remains widely used, it has certain limitations. Angle measurement depends on X-ray quality and patient positioning and can vary between observers. Modern classification systems such as the Garden classification and the AO/OTA classification incorporate additional parameters like fracture displacement and are commonly used alongside the Pauwels system today.

References

Pauwels F. - Der Schenkelhalsbruch, ein mechanisches Problem. Ferdinand Enke Verlag, Stuttgart, 1935.
Meinberg EG, Agel J, Roberts CS, Karam MD, Kellam JF. - Fracture and Dislocation Classification Compendium 2018. Journal of Orthopaedic Trauma, 2018; 32(Suppl 1): S1-S170. PubMed PMID: 29256945.
Bonnaire F, Lein T, Bula P. - Femoral neck fractures in adults: biomechanics, classification and specific therapeutic options. Chirurg, 2011; 82(7): 634-645.

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