I Have Arthritis In My SI Joints. I've Had Steroid

I have arthritis in my SI joints. I've had steroid injections and physical therapy. PT included TENS, deep tissue massage, ultra sound treatment, mobility exercises and water therapy. I've been doing the water therapy and other recommended exercises for almost 3 months since my last visit to the PT but have seen little or no improvement to my pain. Pain is triggered by walking, standing for long periods, and slight bending forward (such as making a bed). Should I see a rheumatologist next?