Adjustable devices for treating arthritis of the knee

A method of changing a bone angle, the method comprising:

• creating an open wedge osteotomy between a first portion and a second portion of a tibia of a patient, wherein the first portion of the tibia remains attached to the second portion of the tibia;
• creating a first cavity in the tibia by removing bone material along a first axis extending from a tibial plateau of the tibia along a medullary canal of the tibia;
• inserting an excavation device through an opening in the tibial plateau and into the first cavity;
• using the excavation device, forming a second cavity to one side of the first cavity;
• removing the excavation device from the first cavity;
• inserting a non-invasively adjustable osteotomy device into the first cavity, the non-invasively adjustable osteotomy device comprising:
• an outer housing;
• an inner shaft telescopically disposed within the outer housing;
• and
• a driving element configured to be operable to displace the inner shaft in relation to the outer housing;
• securing the non-invasively adjustable osteotomy device within the second cavity;
• coupling one of the outer housing or the inner shaft to the first portion of the tibia;
• coupling the other of the outer housing or the inner shaft to the second portion of the tibia;
• and
• operating the driving element displace the inner shaft relative to the outer housing, thereby changing an angle between the first portion and the second portion of the tibia.