Posted in: Arthritis | Posted on: 03 October, 2017
The sometimes development of arthritis at the base of the thumb – the 1st carpometacarpal or 1st CM joint near the wrist – is the price humans pay for having a thumb that can be apposed to other fingers. The base of the first metacarpal bone rotates with respect to the wrist bones to allow this apposition. However this is not a fully developed joint, lacks durability, and overuse of the hand by any repetitive manual tasks (carpentry, golf, guitar, frequent texting etc) can cause painful arthritis of this joint. While we have good success treating arthritis of this joint with PRP (platelet rich plasma) most patients can be treated by a simple activity modification regimen based on the so-called “simian grip.”. This refers to the fact that other primates either have smaller thumbs which they use much less often than humans or in the case of some, like the spider monkey, do not have a functional thumb at all. Instead of wrapping their thumb around objects they grip, they use only their four fingers to encircle objects. This mode of use works well for almost all activities in humans as well. In patients with mild to moderate thumb (1st CM) arthritis, in most cases the discomfort will go away completely or at least substantially such that no other treatment is needed by employing this simian grip method. It is important also though to discontinue use of any pain killers or anti-inflammatory medicines because they mask pain and can also interfere with healing.