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Garden Classification – Femoral Neck Fracture Types

The Garden Classification is an orthopaedic grading system for femoral neck fractures, dividing them into four types based on the degree of bone displacement.

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Things worth knowing about "Garden Classification"

The Garden Classification is an orthopaedic grading system for femoral neck fractures, dividing them into four types based on the degree of bone displacement.

What is the Garden Classification?

The Garden Classification is a globally recognised orthopaedic grading system used to classify femoral neck fractures (fractures of the neck of the femur). It was developed in 1961 by British surgeon R. S. Garden and categorises femoral neck fractures into four types based on the degree of fragment displacement and disruption of the trabecular bone pattern. This classification remains clinically important because it guides treatment decisions and helps predict the risk of complications, particularly avascular necrosis (bone death due to interrupted blood supply) of the femoral head.

The Four Types of the Garden Classification

The classification distinguishes the following four grades of severity:

Garden Type I (incomplete fracture): An incomplete or impacted fracture in which the bone ends remain in contact and the bone is not completely broken. Blood supply to the femoral head is usually preserved.
Garden Type II (complete fracture without displacement): A complete fracture with no displacement of the bone fragments. The trabecular pattern remains largely intact, and the risk of vascular compromise is low.
Garden Type III (complete fracture with partial displacement): A complete fracture with partial displacement of the bone fragments. The trabecular alignment is disturbed, and the risk of avascular necrosis is significantly increased.
Garden Type IV (complete fracture with full displacement): A complete fracture with maximum displacement of the bone fragments. The trabecular pattern is completely disorganised, and the risk of serious complications is highest.

Clinical Relevance

In everyday clinical practice, the Garden Classification is often simplified into two groups: Types I and II are considered undisplaced fractures, while Types III and IV are classified as displaced fractures. This distinction is critical in determining the appropriate treatment approach.

Undisplaced Fractures (Types I and II)

Undisplaced femoral neck fractures are generally managed with internal fixation using screws or an intramedullary nail, aiming to preserve the hip joint. The risk of avascular necrosis of the femoral head is relatively low in these cases.

Displaced Fractures (Types III and IV)

In displaced fractures, the blood supply to the femoral head is commonly compromised. For this reason, especially in elderly patients, hip arthroplasty (hip replacement) is often recommended. In younger patients, surgeons may attempt joint-preserving surgery through open reduction and internal fixation, depending on the individual circumstances.

Diagnosis

Grading a femoral neck fracture according to the Garden Classification is based on plain radiographs of the pelvis and the affected hip, typically taken in two planes (anteroposterior and axial views). In ambiguous cases, a computed tomography (CT) scan may be used for more detailed assessment.

Criticism and Further Developments

Although the Garden Classification is widely used, its inter-observer reliability – the degree of agreement between different assessors – has been critically discussed in the literature. In particular, distinguishing between Types III and IV can be challenging in clinical practice. As a result, many modern trauma surgeons prefer the simplified two-group approach of undisplaced versus displaced fractures. Newer systems such as the AO/OTA Classification complement the Garden Classification in both research and clinical settings.

References

Garden RS. - Low-angle fixation in fractures of the femoral neck. In: Journal of Bone and Joint Surgery (Br), 1961; 43-B: 647-663.
Meinberg EG et al. - Fracture and Dislocation Classification Compendium 2018. In: Journal of Orthopaedic Trauma, 2018; 32 Suppl 1: S1-S170.
NICE Guideline NG111 - Hip fracture: management. National Institute for Health and Care Excellence, 2023.

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