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Mechanical axis of Lower extremity
- line drawn from center of femoral head to center of ankle joint,
- should pass through center of knee.
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Mechanical Axis Measurements
- LDFA = lateral distal-femoral angle
-angle between mechanical axis of femur and the articular surface of the distal femure -Normal 87°
- MPTA = medial proximal tibial angle
-angle between tibial mechanical axis and the articular surface of the proximal tibia -Normal = 87°
- LDTA = lateral distal tibial angle
-angle between tibial mechanical axis and the distal tibial articular surface -Normal =90°
- Femoral mechanical axis
- Tibial mechanical axis
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Average Anatomic Joint Line Measurements
- Proximal femoral angle = 84°
- Lateral distal femoral anatomic angle = 81°
- Medial proximal tibial anatomic angle = 87°
- Distal tibial anatomic angle = 90°
(Price CT, Orthopaedics 2005;28:20)
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