HTO is an abbreviation of 'high tibial osteotomy'.

laminar spreaders opening the bone during high tibial osteotomy
Laminar spreader holding the HTO open until the plate can be applied under imaging control.

 

Realigning the knee joint

In a high tibial osteotomy the upper tibia bone is cut almost through and the bone wedged (usually an opening wedge) and fixed in place with a plate and screws until the bone heals in the new position. This is done to correct the forces going through the joint, frequently in patients with bow-leg (varus) deformity.

Synonyms: 
High tibial osteotomy
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CLINICAL PUBLICATIONS

High tibial osteotomy in varus knees: indications and limits. Loia MC, Vanni S, Rosso F, Bonasia DE, Bruzzone M, Dettoni F and Rossi R. Joints. 2016 Apr-Jun; 4(2): 98–110.


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