Due to lack of stability from the distorted scaphoid, a DISI can be developed. Scaphoid Non-union Advanced collapse (SNAC) is the pattern of osteoarthritis that eventually develops by this process. Stages
Post-traumatic osteoarthritis can be classified into four stages. These stages are similar between SLAC and SNAC wrists. Each stage has a different treatment. Stage I: the osteoarthritis is only localized in the distal scaphoid and radial styloid. Stage II: the osteoarthritis is localized in the entire radioscaphoid joint. Stage III: the osteoarthritis is localized in the entire radioscaphoid joint with involvement of the capitolunate joint. Stage IV: the osteoarthritis is located in the entire radiocarpal joint and in the intercarpal joints. It also may involve the distal radio-ulnar joint (DRUJ). Signs and symptoms
The most common initial symptom of wrist osteoarthritis is joint pain. The pain is brought on by activity and increases when there is activity after resting. Other signs and symptoms, as with any joint affected by osteoarthritis, include:

Morning stiffness, which usually lasts less than 30 minutes. This is also present in patients with rheumatoid arthritis, but in those patients this typically lasts for more than 45 minutes. Swelling of the wrist. Crepitus (crackling), which is felt when the hand is moved passively. Joint locking, where the joint is fixed in an extended position. Joint instability.These symptoms can lead to loss of function and less daily activity. Mechanism
In order to understand the cause of post-traumatic wrist osteoarthritis it is important to know and understand the anatomy of the wrist.
Burping (also called belching and eructation) is the release of gas from the upper digestive tract (esophagus and stomach) of animals through the mouth. It is usually audible. In humans, burping can be caused by normal eating processes, or as a side effect of other medical conditions. There is a range of levels of social acceptance for burping: within certain context and cultures, burping is acceptable, while in others it is offensive or unacceptable. Failure to burp can cause pain or other negative effects. Humans are not the only animals that burp: it is very common among other mammals. In particular, burping by domesticated ruminants, such as cows or sheep, is a major contributor of methane emissions which cause climate change and negatively impacts animal agriculture on the environment. Significant research is being done to find mitigation strategies for ruminant burping, i.e. modifying the animals diets with Asparagopsis taxiformis (red seaweed). Causes
Burping is usually caused by swallowing air when eating or drinking and subsequently expelling it, in which case the expelled gas is mainly a mixture of nitrogen and oxygen. Burps can be caused by drinking beverages containing carbon dioxide, such as beer and soft drinks, in which case the expelled gas is mainly carbon dioxide. Diabetes drugs such as metformin and exenatide can cause burping, especially at higher doses. This often resolves in a few weeks. Burping combined with other symptoms such as dyspepsia, nausea and heartburn may be a sign of an ulcer or hiatal hernia, and should be reviewed by a physician.