TPLO and TTA are the most commonly used geometry altering techniques for cruciate deficient stifles in dogs. Both techniques have a similar success rate, but differ in their complication rate and in complication types. The first part of the lecture is focused on TPLO complications, reaching from of acute bleeding from the popliteal artery, to management of surgical site infections and fractures related to wrong osteotomy placement and jig related issues etc. The second part of the lecture is focussed on the