Post-traumatic arthritis is a condition that occurs in the aftermath of an injury such as a fracture or dislocation. It may also occur after the patient has undergone certain surgical procedures. A type of osteoarthritis or osteonecrosis, post-traumatic arthritis can cause a great deal of pain and discomfort. For some patients, it may be possible to get relief with a regular regimen of medical marijuana. With the use of the herb, the symptoms of post-traumatic arthritis may be much easier to manage.