Phase IV Comparing Rods of Yield Strengths to Correct Adolescent Idiopathic Scoliosis.
Phase IV Comparing Rods of Yield Strengths to Correct Adolescent Idiopathic Scoliosis.
There has been a growing trend amongst surgeons to use a construct for correction of
 scoliosis which involves segmental instrumentation with pedicle screws. Pedicle screw
 proponents cite greater curve control in all planes, which results in improved spinal curve
 correction. Some surgeons have noted due to the increased strength of the all screw
 construction that the rod is now the weak part of the spinal fixation. Although no evidence
 has been raised in regards to hardware failure there is a perception that a loss of balance
 in the sagittal plane is the result of flex in the titanium rod. A novel solution to the
 issue of rod flexibility is raised with the expedium super steel instrumentation which allows
 for greater stiffness than a 5.5 mm titanium rod with the same lower profile. This study aims
 to compare the new super steel technology with other established instrumentations used to
 correct spinal stenosis.
screw purchase was to be recorded but study has been withdrawn.
Inclusion Criteria:

 -  aged 10-20;

 -  presenting with a progressive lenke type 1A, N; or

 -  type idiopathic adolescent scoliosis measuring greater than 45 degree cobb angle

 Exclusion Criteria:

 -  rigid scoliosis requiring a three column release or osteotomy;

 -  patients that can not have pedicle screw instrumentation due to technical concerns