Evaluation of a Prehabilitation Program in Patients Requiring Scoliosis Surgery.

• Pre-habilitation program (Other): Prehabilitation program in 2 steps Step 1- Physical assessment to evaluate patient's level of physical activity, motor skills, and sleep patterns: * Cardiorespiratory fitness (maximal exercise test) to measure VO2max and respiratory function. * Physical activity : Actigraphy (3 days) ; Physical Activity \[Questionnaire for Older Children (PAQ-C) or Adolescents (PAQ-A)\] * Motor skills: Flexibility ("sit and reach" test) ; Isometric strength (handgrip) ; Static balance ("Flamingo" test) ; Dynamic balance * Sleep quality: Pittsburgh Sleep Quality Index ; Actigraphy for 3 days ; Sleep diary Step 2- Personalized pre-rehabilitation program during 3 months, realized at home. Physical activity will be monitored by an adapted physical education teacher. Patient will complete a physical activity logbook during the pre-rehabilitation program, in which he will record the exercises performed and any difficulties encountered, so that subsequent sessions can be adapted accordingly.

Primary outcomes

• Impact of a personalized prehabilitation program [One day before surgery]: Hierarchical analysis of 3 subcriteria: pediatric quality of life, anxiety, and pain (difference in the total score on each scale between the two groups): * Pediatric quality of life was assessed using the PedsQL 4.0 Generic Core Scale, which consists of 23 items; the total score on this scale ranges from 0 to 100, with a higher score indicating a better quality of life. * The HAD scale is a tool used to screen for anxiety (7 questions) and depression (7 questions), with a maximum score of 21 for each category (7 or fewer: no symptoms; 8 to 10: possible symptoms; 11 or more: confirmed symptoms) * Pain will be assessed using a visual analog scale (VAS) ranging from 0 "no pain" to 10 "maximum pain." The ranking of the three subcriteria will be determined in advance by a vote of all patients (point-based voting, by majority vote). Parents will be asked to follow the same procedure (vote) to conduct a sensitivity analysis on the results obtained.

Secondary outcomes

• Impact on changes over time in the total score and the various dimensions of the Pediatric Quality of Life Inventory (PedsQL 4.0) for children in each patient group [Preoperative consultation (inclusion) ; one day before surgery ; 3, 9 and 15 months after surgery]: Total score and scores on each dimension of the scale (child self-report) (Physical Functioning ; Emotional Functioning : Social Functioning ; School Functioning)
• Impact on changes over time in the total score and the various dimensions of the Pediatric Quality of Life Inventory (PedsQL 4.0) for parents in each group [Preoperative consultation (inclusion) ; one day before surgery ; 3, 9 and 15 months after surgery]: Total score and scores on each dimension of the scale (child self-report) (Physical Functioning ; Emotional Functioning : Social Functioning ; School Functioning)
• Impact on changes over time in the anxiety score (HAD scale) in each patient group [Preoperative consultation (inclusion) ; one day before surgery ; 3, 9 and 15 months after surgery]: HAD scale is a tool used to screen for anxiety (7 questions) and depression (7 questions) with maximum score for each category = 21 (7 or less: no symptoms ; 8 to 10: possible symptoms ; 11 or more: definite symptom)
• Impact on changes over time in the pain score (VAS) in each patient group [Preoperative consultation (inclusion) ; one day before surgery ; 3, 9 and 15 months after surgery]: Pain will be assessed using Visual Analog Scale (VAS) ranging from 0 "no pain" to 10 "maximum pain"
• Impact of a personalized prehabilitation program on preoperative quality of life (EQ5D-Y-3L) in pediatric patients undergoing scoliosis surgery. [One day before surgery]: EQ5D-Y-3L questionnaire
• Impact on changes over time in quality of life score (EQ5D-Y-3L) in each group [Preoperative consultation (inclusion) ; one day before surgery ; 3, 9 and 15 months after surgery]: EQ5D-Y-3L questionnaire
• Description of physical activities per session/weekly (to be determined) by patients (Pre-habilitation Group). [During the 12 weeks of the pre-habilitation program]: Descriptive analysis of the exercises performed, the intensity levels (Level 1 - Level 2 - Level 3), and the difficulty as perceived by the patients while performing the exercises (the child's assessment of whether "it is difficult to do or not" on a scale of 0 to 10).
• Patients' level of fitness for duty (Pre-habilitation Group). [Initial assessment (within 10 days of inclusion)]: Fitness for duty will be assessed by measuring VO2max (L/min)
• Patients' level of physical activity (Pre-habilitation Group). [Initial assessment (within 10 days of inclusion)]: Physical activity will be eassessed using actigraphy (worn at home for 3 days) and PAQ-C (Physical Activity Questionnaire-Children) or PAQ-A (Physical Activity Questionnaire-Adolescents).
• Patients' level of motor skills (flexibility) at the initial assessment (Pre-habilitation Group) [Initial assessment (within 10 days of inclusion)]: Flexibility will be assessed using "Sit and reach test", measured in centimetres, positive or negative value
• Patients' level of motor skills (Isometric strength) at the initial assessment (Pre-habilitation Group) [Initial assessment (within 10 days of inclusion)]: Isometric strength will be assessed using a handgrip, measured in Arbitrary Units
• Patients' level of motor skills (Static balance) at the initial assessment (Pre-habilitation Group) [Initial assessment (within 10 days of inclusion)]: Static balance will be assessed using using Flamingo test, measured in second
• Patients' level of motor skills (Dynamic balance) at the initial assessment (Pre-habilitation Group) [Initial assessment (within 10 days of inclusion)]: Dynamic balance will be measured by the number of steps taken
• Sleep patterns at the initial assessment (Pre-habilitation Group). [Initial assessment (within 10 days of inclusion)]: Pittsburgh Sleep Quality Index (PSQI) Actigraphy (over 3 nights at home) with a sleep diary
• Usability, use by children, and satisfaction with the digital solution (CHUGA patient portal) (Pre-habilitation Group). [3 months after surgery (follow-up visit)]: Individual interview conducted with an ergonomist to assess patient and parent satisfaction with the digital solution (CHUGA patient portal), with a view to improving it and its use by children.
• Definition of minimal clinically important differences (MCID) for the three sub-criteria of quality of life, anxiety, and pain, for the patient and their parents (Pre-habilitation group). [One day before surgery]: Patient and parent responses to the questions: * "Are you feeling less pain?" / "Is your child feeling less pain?" \[yes/no\] * "Are you less stressed?" / "Is your child less stressed?" \[yes/no\] * "Do you feel better?" / "Does your child feel better?" \[yes/no\]

Sex: All, ages: 10 Years to 17 Years

Inclusion Criteria:

* Patient with severe idiopathic scoliosis requiring surgery
* No known associated pathology
* No previous surgical treatment on the spine
* Able to understand recommendations and express oneself in French
* Child whose parents speak French fluently and are able to understand instructions
* Parent with a myCHUGA account
* Having a cellphone and an internet connection
* Child whose parents are affiliated with social security or beneficiaries of such a scheme
* Children who gave their consent to participate in the study
* Child whose parents have signed the study consent form

Exclusion Criteria:

* Refusal of consent by a child of an age to give consent or by parents
* Subject excluded from another study
* Subject who cannot be contacted in case of an emergency
* Protected persons covered by articles L1121-5, L1121-6 and L1121-8 of the French Public Health Code.
* Patients whose parents are covered by Article L1121-8 of the French Public Health Code (persons subject to legal protection measures or unable to express their consent)
* Personnel with a hierarchical relationship with the principal investigator