Answer:Roger may be suffering from a condition known as Cushing's syndrome as a result of prolonged use of prednisone.
Explanation: Arthritis is a rheumatic condition which is referred to as the inflammation that occurs in the joints and the tissues related to it. This causes severe pain at the affected joints. For treatment, anti-inflammatory medications such as corticosteroids are used. Prolonged use of these drugs can lead to development of a condition known as Cushing's syndrome. The abnormal feelings is due to muscle weakness,the swelling is due to water and salt retention, and the anti-inflammatory effect of the drug plays a role in suppression of immune-related defense mechanisms, increasing his susceptibility to colds. I hope this helps. Thanks.