Level I, prospective randomized study.

Biplanar retrotubercle medial open-wedge osteotomy and monoplanar medial open-wedge osteotomy are both clinically effective for the treatment for varus gonarthrosis. Retrotubercle osteotomy also prevents patella infera and tibial slope changes radiologically.

In geographic regions where hydatidosis is endemic, hydatid cyst should be included in the differential diagnosis of a cystic mass in the muscle to avoid fine-needle biopsy and the consequences of spillage of cyst contents.