Understanding.
Instability can correspond to excessive flexion or subluxation when sitting. It can cause mechanical pain, particularly when sitting or standing up.
The assessment.
The examination looks for concordant pain. Dynamic standing and sitting radiographs assess movement; a normal static radiograph does not rule it out. MRI can supplement an inconclusive assessment.
Treatments.
Adapted seating, rehabilitation based on the findings, and injections are among the options. Surgery is reserved for selected cases after appropriate treatment has failed.
Follow-up.
Follow-up focuses on tolerance for sitting and daily activities. An image alone does not determine the need for surgery.
Your questions.
Is it the same as a dislocation?+
A dislocation is a joint displacement; instability is broader and also includes excessive mobility without dislocation.
Coccygectomy.
Indications, preparation, procedure, follow-up, and risks: key information for discussing this option during a consultation.