Sigmoid volvulus is a rare but potentially life-threatening condition caused by abnormal changes in the sigmoid colon surrounding the mesentery. The purpose of this article is to determine the trunk length of the unchecked S-bracket. Methods: This study was a case-control study conducted in two tertiary teaching hospitals in central India. Patients included patients 18 years of age or older with surgically proven sigmoid volvulus; controls included people aged 18 years or older who had undergone other surgeries that did not involve the colon, sigmoid, or rectum. Results: Intraoperative sigmoid measurements, including midsigmoid root width and midsigmoid length. Observations and results: A total of 30 cases and 30 controls were included. The sigmoid colon was longer and wider in the subjects than in the control group. However, mean sigmoid root width was similar between groups. These findings support that sigmoid torsion results from broad-based rotation of a long and wide midsigmoid colon. This is the first adequately controlled study to examine the anatomy of sigmoid torsion and provides strong evidence to confirm previous theories about the anatomical basis of sigmoid torsion.