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AO/OTA Fracture and Dislocation
Classification—Review
Date:
Acknowlegment:
Paul Szypryt, UK
Date:
Non-Operative and
Operative Fracture Management
Learning outcomes
• Recognize the need and purpose of a fracture
classification system
• Describe the AO/OTA Fracture and Dislocation
Classification system and its clinical importance for
decision making and preoperative planning
• Outline the structure of this classification for long-bone
fractures
• Name the bone segments and use their numeric code
• List types, groups, subgroups, qualifiers, and modifiers
• Properly classify long-bone fractures
Location— bone
Location—bone
• Numeric code:
1. Humerus 1
2. Radius/ulna
3. Femur
4. Tibia/fibula
1
Location — segment
Tibia
Location—segment
1. Proximal
2. Diaphysis
3. Distal
3 1
Location—bone and segment
4 3
Morphology—type, group, and subgroup
Type A B C
Type + Group A1
A2
A3
B1
B2
B3
C1
C2
C3
Type + Group +
Subgroup
A1.1, A1.2, A1.3
A2.1, A2.2, A2.3
A3.1, A3.2, A3.3
B1.1, B1.2, B1.3
B2.1, B2.2, B2.3
B3.1, B3.2, B3.3
C1.1, C1.2, C1.3
C2.1, C2.2, C2.3
C3.1, C3.2, C3.3
Morphology
Less
to
severe
Less to severe
Morphology—diaphyseal types
Morphology—diaphyseal groups
Morphology—metaphyseal/epiphyseal types
Extra-articular fracture
Partial articular
fracture: part of joint
remains in continuity
with diaphysis
Complete articular
fracture: no part of joint
remains in continuity
with diaphysis
11–Humerus proximal types
31–Femur proximal types
44–Malleolar types
Location and morphology
Location and morphology
Location and morphology
42.B3.2 IO4 MT2 NV1
Take-home message
• There is a need for a comprehensive fracture
classification
• The AO/OTA Fracture and Dislocation
Classification system is reasonably user-friendly
31-year-old man, motorcycle collision
Right femur Left femur
33-A3
Right femur
33-C2
Left femur
42-C3

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3. AO OTaFracture and Dislocation Classification.pptx