Preoperative measurements
Using digital radiography

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Take the X-ray projection with the extended stifle
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Use a radiographic reference (blue circle) to adjust for radiographic magnification

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Measuring the advancement of the crest
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Standard tibial plateau technique
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Draw the line for the tibial plateau (1)
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Draw the orthognal to (1) starting at the origin of the patellar tendon (PT) on the patella (2)
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Measure the distance (3) between the insertion of the PT on the tibial tuberosity (TT) and (2)

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Move the measurement (2) to the distal top of the tibial crest.
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Draw the circle (4) whose radius is the measure (2)

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Measure the TPA (= Tibial Plateau Angle)
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In patients with high TPA it is better to use locked plates.

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Draw the position and direction of the osteotomy
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Mark a point immediately cranial to the tubercle of Gerdi (1)
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Measure the thickness of the tibial cranial cortex taking a point twice the length of the tibial crest starting from the TT (2)

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Draw the line joining the point (1) with the midpoint of the arc of circumference (4) superimposed on the tibia

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Additional measures
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Measure the distance between the ALL and the cranial point (1) at the Gerdi tubercle