If you feel pain at the base of your thumb (down by the wrist) when you pinch or grasp something, you may have arthritis of the basal or CMC joint. This very unique joint is the most common site for arthritis in the hand. If you are a woman over the age of 40 (and willing to admit it), you stand a higher than average chance of having thumb arthritis. There are other conditions that can also cause pain around the base of the thumb so it is important to discuss the problem with your health care provider.
The good news is - there are things you can do to alleviate the pain and lessen the progression of the arthritis.
Stages of arthritis
Like any other type of arthritis, CMC joint arthritis can be mild or very severe, interfering in your ability to perform daily activities. As a therapist deciding how to treat someone, I break thumb arthritis down into three stages.
At the onset of CMC joint arthritis, you may feel a "grabbing" or sharp pain only when you start doing an activity. You may find the pain diminishes once the activity gets underway only to return when you stop the activity. This occasional pain is easy to ignore - but I don't advise it.
As the arthritis progresses, pain may be present with even light activity or at rest. You may also experience pain and tenderness when you touch the joint. At this point you may notice the base of the thumb "sticking out" and looking as though it is a little ledge or step. Now if there were any doubt you have CMC arthritis, your thumb is definitely telling you otherwise.
In later stages, the thumb can assume a few different "crooked" postures. When the middle knuckle of the thumb (the MCP joint at the level of the web space) is flexed or bent, and the end or IP joint is hyperextended, it is called a Boutonniere Deformity.
The opposite of this posture is a Swan Neck deformity. The MCP is hyperextended and it may be difficult to move he thumb sideways, opening the web space. With time, the skin in the web can shrink, making it impossible to open the thumb away from the palm.
In late stages, pain may actually decreases but the deformity impairs function and strength is greatly diminished.
Is there anything I can do not to end up with Stage 2 or Stage 3 arthritis?
It would be really nice to be able to say - if you take this pill, wear this splint, or do this exercise, the arthritis will not progress or it may even go way. Unfortunately for those with a family history of arthritis or those who just did not win the toss of the die for long lived, healthy bones, the disease may progress despite the best care.
What you can do however, is learn to use your hands so they take less stress, use devices that help you perform daily tasks with less stress, and wear functional splints or braces that support the joint.
Even at the very early stages of CMC arthritis, wearing a support that applies light compression and helps maintain the integrity of the joint, can really help relieve pain and allow better function.
I can't wear a hard splint and still work. Are there other options?
There are other lighter weight foam lined splints that provide cushioning, support and light compression with only slight restriction on motion. 3pp splints from 3-Point Products offer some very functional options in lightweight thumb and wrist splints, such as the 3pp ThumSling.
What if I need more support?
If you need more control, moderate splints from 3-Point Products, such as the Ultra Spica or the ThumSaver MP might be a better fit. If you need to fully immobilize your thumb, the 3pp ThumSpica Plus (which should be fit by a health care professional) or the ThumSaver CMC Long are great options.
The important thing to know is that you can do something to decrease the pain and reduce stress to try and limit future deformity and dysfunction.
If you are ready to buy a 3-Point Products splint, please click the 'buy now' button to purchase.
More information about thumb arthritis:
I Think I Have Thumb Arthritis. What Do I Do?
My Thumb Hurts. What's Wrong?
Author: Julie Belkin