The most important factor for ease of operation and safety during spinal anesthesia is the determination of the spinal space. Increasing lumbar flexion facilitates access to the spinal space. Traditionally, patients undergo spinal anesthesia with lateral or sitting lumbar flexion.

In a study by Martha L Walker et al., The maximum extension of the knees, adduction of the hip, and a modified sitting position with the back flexion, ie, the abdominal crunch position, were found to be effective in increasing the flexion of the lumbar spine.

In our study, we aimed to measure the interspinal distance with the abdominal crunch position with the help of ultrasonography (USG) and to compare the interspinal distance with the measurements obtained in traditional positions (sitting position and lateral decubitus).

Interspinal distance will be measured by ultrasonography by 3 different positions, respectively, for the patients who will undergo elective surgery and meet the study criteria and give voluntary consent.

This evaluation process is to record and compare the measurement results. Patients will not undergo any interventional procedures.

Patients who have difficulty in positioning due to hip, femur, knee and tibial fractures or arthrosis and who cannot be communicated will not be included in the study.

One hundred of patients over the age of 18 who will undergo elective surgery will be included in the study.

Inclusion Criteria:

• Patients over the age of 18
• Undergo elective surgery

Exclusion Criteria:

• Patients with vertebral anomaly
• Patient with not communicated

One hundred of patients over the age of 18 who will undergo elective surgery will be included in the study.