hi, thank-you for providing the brief history of you As the mechanism of injury indicates a shoulder pathology and needs a thorough clinical examination and an x-ray or MRI. If it is a bony issue which found during examination than x-ray should be fine but in case if we find something like capsular issue of the shoulder joint then an MRI might be needed. based on the clinical findings and correlation with the MRI or x-ray will help an accurate diagnosis. treatment will be simple pain killers and more of physical therapy as this looks more of a muscular weakness and needs a thorough strengthening protocol. In my clinical practice such cases undergo a thorough clinical examination and an MRI post which physical therapy strengthening protocol helps them alot to recovery. Regards Jay Indravadan Patel