Differential Diagnosis for Internal Snapping Pelvis
- Single most likely diagnosis
- Coccygeal subluxation or fracture: This is the most likely diagnosis due to the internal snapping sound, which can occur when there is a disruption in the coccyx or its surrounding ligaments, leading to abnormal movement and the characteristic snapping sound.
- Other Likely diagnoses
- Iliopsoas tendonitis or snapping hip syndrome: This condition occurs when the iliopsoas tendon snaps over the iliopectineal eminence or the femoral head, producing an audible snap. It's a common cause of internal snapping sounds in the pelvic area.
- Osteitis pubis: This is an inflammatory condition affecting the pubic symphysis, which can cause pain and snapping sounds due to instability or inflammation of the joint.
- Do Not Miss (ddxs that may not be likely, but would be deadly if missed.)
- Pelvic fracture: Although less common, a pelvic fracture can cause an internal snapping sound, especially if there is a fracture of the pubic rami or the sacrum. Missing this diagnosis could lead to significant morbidity or mortality.
- Cauda equina syndrome: This is a rare but serious condition where the nerves in the spinal canal are compressed, which can cause a range of symptoms including pain, numbness, and weakness in the lower extremities. An internal snapping sound could potentially be a presenting symptom of this condition.
- Rare diagnoses
- Synovial chondromatosis of the hip: This is a rare condition where cartilaginous nodules form in the synovial membrane of the hip joint, which can cause snapping or clicking sounds.
- Intra-articular loose body: A loose body within the hip joint, such as a fragment of bone or cartilage, can cause snapping or clicking sounds as it moves within the joint.