Serious valgus or varus deformity should be corrected by osteotomy. For teenagers osteotomy or bone cutting is often used to correct the bone deformity. Surgical treatments are closing wedge osteotomy, opening wedge osteotomy, and reversed wedge osteotomy. The word "osteotomy" means the division, or excision of bone. Small horses and ponies can have an ostectomy without an osteotomy of the greater trochanter. During the offseason, Yzerman underwent a knee realignment surgery known as an osteotomy. The maxilla can be adjusted using a "Lefort I" level osteotomy (most common). At that time, a Le-Fort I osteotomy to impact the maxilla is usually done. Then the orbits and the midface are released from the skull-base using monoblock osteotomy. Additionally, the midface can be mobilized by using a Lefort II, or Lefort III osteotomy. This may not be a severe problem or may require subsequent osteotomy surgery for correction. Surgery is also a possibility, with osteotomy or stabilization with Kirschner intramedullary wire. The dental osteotomy allows surgeons to visualize the jawbone, and work accordingly. On the dorsal side, at the level of the midcarpus, a wedge osteotomy is made.