Thank you for your question. The inflammation of the cartilage between between the clavicle and sternum could indeed be caused by excessive strain on the sternoclavicular joint by the position you kept your arm in. This strain to sternoclavicular joint could range in severity. In fact, the sternoclavicular joint can actually become dislocated, resulting pain and inflammation of this joint. In order to determine how severe this injury is, we recommend that you have this area examined by your doctor to determine the extent of this injury. Treatment is usually supportive in nature, treating the pain and inflammation. You can also be advised to restrict your movement for some time to ensure adequate healing of this injury.
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