surgery is only indicated for pain because of osteoarthritis
in your hip and so if you are not in too much pain then I think you are correct to hold off on surgery. There is no scientific medical literature to support the use of Strontium ranelate to prevent the advancement of osteoarthritis. Osteoarthritis is a slowly progressive disease for which there is no known treatment to prevent its progression. Keeping your BMI below 25, exercising, physiotherapy
and anti-inflammatory medication can all be helpful in controlling symptoms.