In our study, a lordosis angle will be created to support the existing lordosis using a steel-baleen elastic soft lumbosacral orthosis, and its effect on performance will be investigated using the tests applied. A soft lumbosacral orthosis suitable for the individuals will be used in three dimensions. Half of the individuals will be evaluated using these test methods first with a corset and then without a corset; the other half will be evaluated first without a corset and then with a corset. Tests will be repeated before and after orthosis use to determine the effectiveness of the orthosis.

The effect of trunk corsets on postural control and walking, GYA independence

Developed by Duncan et al. in 1990 to assess dynamic balance. The maximum distance reached forward with the arm without disrupting the fixed standing position is measured. The distance between the third metacarpals is measured at the start and end positions of the test. The subject is asked to reach forward three times, and the average is taken. It is valid and reliable for children with SP (ICC = 0.94, 0.97, 0.98).

Developed by a team of occupational therapists and physiotherapists at Sunny Hill Health Centre in Vancouver, Canada, to assess seated posture. SPCM evaluates the child's postural impairment as well as the effect of sitting on postural control.

The Paediatric Berg Balance Scale (PBBS), a version of the Berg Balance Scale adapted for children by Franjoine and colleagues, will be used to assess functional balance in daily living activities. The scale consists of 14 items, each scored from 0 to 4, with a maximum possible score of 56.

Used to assess functional mobility and dynamic balance. The TUG is a valid and reliable test for assessing balance in children with cerebral palsy (r=0.99). A chair with a backrest but no armrests is used for the assessment. The test begins with the child sitting on the chair with their hips and knees flexed at 90°. The child is asked to stand up from the chair, walk 3 metres, and sit back down. The time taken from standing up from the chair to sitting back down is recorded. The test is repeated 3 times, and the average of these three values is taken for analysis.