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Hip replacement is major surgery but has excellent patient satisfaction with more than 90% of patients reporting good to excellent results. The decision to replace your hip is based on a combination of your reported symptoms, impact on your day-to-day life, examination findings and imaging (XRAYS or CT scan).
Below is a link to a self-reported scoring system to determine the severity of your arthritis. While not the only factor to consider in determining your appropriateness for joint replacement surgery, it is validated and helpful to quantify your symptoms and potential improvement from joint replacement surgery.
More information: http://www.orthopaedicscore.com/scorepages/oxford_hip_score.html