Ossification of the Sacroiliac Joint: A Case Series

The sacroiliac (SI) joint, a key weight-bearing joint of the axial skeleton, is primarily designed for stability, supported by strong intrinsic and extrinsic ligaments.Although ossification of the SI ligaments is rare, it can lead to joint stiffness, pain, and potential neurovascular compression.During routine osteology demonstrations, three dry human pelves were observed with partial ossification of the anterior SI ligament, with additional ossification of the posterior and sacrotuberous ligaments in one case.These findings suggest progressive age-related changes or possible subclinical pathological processes affecting the joint.This case series highlights the anatomical variability and ossification patterns in the SI joint ligaments.Understanding such ossifications is essential for accurate interpretation of radiological imaging and can aid in the early diagnosis of conditions involving restricted SI joint mobility and sacropelvic pain.