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The specific injury area I want to address today is that involving the neck. Neck injuries are actually very common in BJJ. We are always getting put in positions that put a strain on the neck, whether itâs a headlock, we are inverted, or even getting stacked. That part of our body takes a beating in this sport. Now obviously the neck is a vital anatomic junction.
CMCJ symptoms. Carpometacarpal joint arthrosis results in pain and swelling at the base of the thumb. Bone spurs can develop which gives the thumb a squared-off appearance. The swelling is associated with laxity and instability of the ligaments that support the thumb, resulting in further wear and tear of the joint.arpometacarpal joint arthrosis is very common and there are many causes. Approximately 50 percent of woman over the age of 50 and approximately 75 percent of all individuals over the age of 65 can develop CMCJ arthrosis. The base of the thumb is subjected to high mechanical sheer and compression forces.