Classification system
Schatzker Classification
Schatzker Classification of Tibial Plateau Fractures
The Schatzker classification sorts tibial plateau fractures into six types by the plateau involved and the fracture pattern, where types I to III involve the lateral plateau and carry a better prognosis, and types IV to VI are higher-energy injuries with medial, bicondylar or metaphyseal-diaphyseal involvement.
What the Schatzker category means
Schatzker scores run from 1 to 6, where a lower score is better. The bands below are conventional reporting categories, not diagnostic cut-offs.
- Lower-energy (I–III)1–3
Lateral plateau patterns, generally lower-energy with a better prognosis.
- Higher-energy (IV–VI)4–6
Medial, bicondylar or metaphyseal-diaphyseal patterns. Higher-energy, with substantially higher complication rates.
Published criteria and reliability
The published cut-offs that define this instrument, and the measured agreement between observers using it. Each is reported with the population it was derived in.
| Type | Value | Subscale | Population | Follow-up | Source |
|---|---|---|---|---|---|
| Criterion | Types IV–VI carry substantially higher rates of compartment syndrome, infection and poor outcome | — | Tibial plateau fractures | — | Schatzker J 1979 |
| Criterion | Interobserver agreement is moderate on radiographs and improves with CT | — | Orthopaedic surgeons classifying the same fractures | — | Walton NP 2003 |
| Criterion | CT alters the Schatzker type in a meaningful proportion of cases compared with radiographs alone | — | Tibial plateau fractures assessed with both modalities | — | Markhardt BK 2009 |
Criterion is a published cut-off, definition or performance figure belonging to a classification or decision rule — it is not a change score and should not be read as one.
How the score is calculated
Stated in full so the calculation can be independently checked, and reproduced by hand if needed.
Type I is a split fracture of the lateral plateau without depression. Type II is a lateral split with depression of the articular surface. Type III is a pure central depression of the lateral plateau with an intact cortical rim. Type IV is a fracture of the medial plateau. Type V is a bicondylar fracture in which the metaphysis remains in continuity with the diaphysis. Type VI is a plateau fracture with dissociation of the metaphysis from the diaphysis. Types I to III are conventionally treated as lower-energy lateral injuries and types IV to VI as higher-energy injuries.
Instrument profile
- Developer
- Joseph Schatzker and colleagues
- Institution
- Sunnybrook Hospital, University of Toronto, Canada
- First published
- 1979
- Items
- 1
- Response format
- Single six-level radiographic pattern
- Score range
- 1 to 6
- Direction
- Lower score = better
- Completion time
- About 1 minutes
- Regions
- Knee
- Conditions
- Tibial plateau fracture, Knee trauma, Intra-articular knee fracture
- Procedures
- Open reduction internal fixation, Buttress plating, Spanning external fixation, Percutaneous screw fixation
- Observer agreement
- Interobserver kappa typically 0.5–0.7, higher with CT than with radiographs alone
- Validity
- Type correlates with mechanism, energy, associated soft tissue injury and outcome, which is why it remains the most widely used tibial plateau classification.
- Reliability
- Reliability is moderate and improves substantially with CT. The main conceptual limitation is that the system was built on the anteroposterior radiographic appearance and under-represents posterior and posteromedial fragments, which the three-column and other CT-based classifications were developed to capture.
When to use the Schatzker
Well suited to
- Classifying a tibial plateau fracture to communicate pattern, anticipate associated injuries and plan fixation.
- Research and audit, where it is the standard descriptor for plateau fracture severity.
Limitations and poor fits
- As a complete surgical plan — CT-based columnar classifications describe the posteromedial and posterolateral fragments that determine the approach.
- Without assessing soft tissues, compartments and vascular status, particularly in types IV to VI.
- For extra-articular proximal tibial fractures, which the system does not cover.
Schatzker compared with other instruments
Instruments measuring a related construct, with the practical difference between them.
| Instrument | Items | Range | What it adds |
|---|---|---|---|
| Gustilo-Anderson | 4 | 1–5 | The Gustilo-Anderson classification grades open fractures from type I to type IIIC by wound size, degree of soft tissue damage, contamination and vascular injury, and it is the system that drives antibiotic choice, debridement planning and the decision on soft tissue coverage. |
| KOOS | 42 | 0–100 | The KOOS is a 42-item patient-reported questionnaire that scores knee function as five separate subscales — Symptoms, Pain, Activities of Daily Living, Sport and Recreation, and Quality of Life — each from 0 (extreme problems) to 100 (no problems). |
| Kellgren-Lawrence | 1 | 0–4 | The Kellgren-Lawrence classification grades radiographic osteoarthritis from 0 to 4 based on osteophyte formation, joint space narrowing, subchondral sclerosis and bone contour deformity, with grade 2 conventionally taken as the threshold for definite radiographic osteoarthritis. |
Copyright and permitted use
Published openly because it is the question every clinician and researcher asks before using an instrument, and almost nobody answers it.
A published fracture classification system. The type definitions are freely reproducible and no licence is required.
References
- Schatzker J, McBroom R, Bruce D. The tibial plateau fracture: the Toronto experience 1968–1975. Clinical Orthopaedics and Related Research. 1979.PMID 445923
- Walton NP, Harish S, Roberts C, Blundell C. AO or Schatzker? How reliable is classification of tibial plateau fractures?. Archives of Orthopaedic and Trauma Surgery. 2003.PMID 12734718
- Markhardt BK, Gross JM, Monu JU. Schatzker classification of tibial plateau fractures: use of CT and MR imaging improves assessment. RadioGraphics. 2009.PMID 19325058
Editorial status
This page has not yet been signed off by a named clinical reviewer. The scoring logic is stated in full above so it can be independently verified, and every threshold is traceable to its source. See our editorial methodology.