Sacroiliac joint (SIJ) is an uncommon localisation of osteoarthritis. Instability of this joint is one of rare aetiologies. It can occur after resection
of the pubic symphysis for whatever the reason. The biomechanical consequences on the SIJ are increasing shear forces and vertical restrain. This
leads to secondary progressive SIJ osteoarthritis. There is no specific rehabilitation programme for this pathology. Here, we report the case of a
patient who presents SIJ osteoarthritis 20 years after surgical resection of the pubic symphysis for osteochondroma. We proposed a rehabilitation
programme based on the pelvic biomechanical characteristics. It included specific exercises of muscular strengthening (the transversely oriented
abdominal muscles and pelvic floor muscles) and muscular stretching (the psoas major muscle). We obtained an improvement of pain and
functional capacity in our patient.