Gardens classification
Asking for Preferences
Reading File
Finding Sources
Searching PubMed
Garden classification femoral neck fracture
Reading File
Reading File
Finding Sources
Reading File
I now have comprehensive information from three major orthopedic textbooks. Here is the full answer:
Garden Classification of Femoral Neck Fractures
Described by Robert S. Garden in 1961, this is the most widely used classification system for intracapsular femoral neck fractures. It grades fractures I-IV based on the degree of displacement, assessed on the AP radiograph by examining the alignment of the compressive trabecular lines in the femoral head relative to those in the acetabulum.
The Four Grades
| Grade | Description | Trabecular Pattern |
|---|---|---|
| I | Incomplete fracture - valgus impacted; medial calcar intact | Head trabeculae angled relative to acetabular trabeculae (tilted into valgus) |
| II | Complete fracture; non-displaced | Trabecular lines in the head are collinear with those in the acetabulum and the distal neck |
| III | Complete fracture; partially displaced | Neck-head contact maintained, but trabecular lines are no longer aligned |
| IV | Complete fracture; fully displaced | No neck-head contact; trabecular lines paradoxically re-align (head rotates back to neutral) |
Key Radiographic Trick: III vs. IV
- Garden III - femoral neck and head still in contact; trabeculae are mis-aligned
- Garden IV - femoral neck and head lose contact; trabeculae appear re-aligned (the head has rotated freely back to a neutral position relative to the acetabulum)
This paradoxical re-alignment in Grade IV can be mistaken for a non-displaced fracture if the displacement is not recognized.
Clinical Significance
| Group | Grades | Stability | Preferred Treatment |
|---|---|---|---|
| Non-displaced / stable | I & II | Stable | Internal fixation (3 parallel cannulated screws) |
| Displaced / unstable | III & IV | Unstable | Arthroplasty (hemi or THA) in most adults |
The main distinction surgeons reliably make is I/II (non-displaced) vs. III/IV (displaced) - this binary split drives management decisions. Inter-observer agreement across all four grades is poor (~22% in some studies), but agreement on the displaced/non-displaced split is much higher.
Complications (Higher Grades = Greater Risk)
- Avascular necrosis (AVN) of the femoral head - due to disruption of the retinacular blood supply (mainly the lateral epifyseal/superior retinacular artery from the medial femoral circumflex artery)
- Non-union - especially in displaced fractures treated with internal fixation (failure rate up to 30%)
- Both risks increase with grade, primarily because displacement tears the retinacular vessels
Limitations of the Garden Classification
- Poor inter-observer reliability across all four grades (only ~22% full agreement; Frandsen et al.)
- Grades I and II are often merged in practice because outcomes are similar
- Grades III and IV are often merged because both are typically managed with arthroplasty
- The classification only considers the AP plane - sagittal angulation is ignored. Some authors recommend that Garden I/II fractures with ≥20° of sagittal plane angulation should not be treated as stable
- Very few true Garden II fractures exist in practice (only 1.2% in one multicenter trial of 1,503 fractures)
Related Classifications
- Pauwels classification - based on the angle of the fracture line to the horizontal (Type I: <30°, Type II: 30-50°, Type III: >50°); more vertical = more shear = higher fixation failure risk
- Anatomic location - subcapital (most common), transcervical, basicervical - location has not been shown to independently influence outcome
Sources: Campbell's Operative Orthopaedics 15th Ed 2026; Rockwood and Green's Fractures in Adults 10th Ed 2025; Miller's Review of Orthopaedics 9th Ed
This is a shared conversation. Sign in to Orris to start your own chat.