derotation

It is used for image rotation and derotation.

The surgery is called derotation osteotomy, in which the bone is broken (cut) and then set in the correct alignment.

Its altazimuth mounting dictates the need for a field derotation mechanism to maintain the orientation of the field of view.

An EDF (elongation, derotation, flexion) cast is used for the treatment of Infantile Idiopathic scoliosis.

The field of a Pfund telescope rotates at a nonuniform rate during tracking, precluding it from long-exposure astrophotography unless a derotation control matrix and optics are used to compensate field rotation.

Dr. Nicholas and the staff at Lenox Hill Hospital's brace shop developed the Lenox Hill derotation brace to protect chronically unstable and surgically repaired knees.

In general a doppler ultrasound should be obtained in low suspicion cases to rule out torsion while in those cases with a convincing history and physical exam immediate surgical detorsion (derotation) is reasonable.

Less common surgical treatments for SMA syndrome include Roux-en-Y duodenojejunostomy, gastrojejunostomy, anterior transposition of the third portion of the duodenum, intestinal derotation, and division of the ligament of Treitz(Strong's operation).

It has been proven possible to permanently correct cases of infantile idiopathic scoliosis by applying a series of plaster casts (EDF: elongation, derotation, flexion) on a specialized frame under corrective traction, which helps to "mould" the infant's soft bones and work with their growth spurts.