Corrective measures for scoliosis involve a combination of exercises, bracing, and in severe cases, surgery. The options provided in the question, Trikonasana and lying down in the prone position, are two specific exercises that can help in managing scoliosis. Let's discuss these measures in detail.

1. Trikonasana (Triangle Pose):
- Trikonasana is a yoga pose that involves standing with the legs wide apart and reaching one hand towards the opposite foot while keeping the other hand raised towards the ceiling.
- This asana helps in stretching and strengthening the muscles of the spine, abdomen, and legs, which can contribute to improving posture and reducing the curvature of the spine in scoliosis.
- Regular practice of Trikonasana, under the guidance of a qualified yoga instructor, can help in maintaining spinal alignment and flexibility.

2. Prone Position:
- Lying down in the prone position refers to lying flat on the stomach, facing downwards.
- This position helps in elongating and decompressing the spine, which can provide temporary relief from discomfort associated with scoliosis.
- It also helps in strengthening the muscles of the back and improving posture.
- However, lying down in the prone position should be done under the guidance of a healthcare professional, as it may not be suitable for everyone depending on the severity of the scoliosis and any other underlying conditions.

3. Other Corrective Measures:
- In addition to specific exercises, scoliosis can also be managed through other measures such as physical therapy, bracing, and surgery.
- Physical therapy involves exercises and stretches that target the muscles of the back, abdomen, and hips to improve posture, flexibility, and muscle strength.
- Bracing is often recommended for adolescents with moderate scoliosis to prevent further progression of the curvature. This involves wearing a specially designed brace that helps in straightening the spine and supporting its alignment.
- In severe cases of scoliosis, where the curvature is significant and causing breathing difficulties or other health issues, surgery may be recommended. The surgery aims to correct the curvature by placing rods, screws, or other hardware to stabilize the spine.

Overall, scoliosis management involves a multidisciplinary approach, including exercises, bracing, and surgery, depending on the severity of the condition. It is important to consult with a healthcare professional, such as a physiotherapist or orthopedic specialist, for an accurate diagnosis and personalized treatment plan.