Wednesday, May 2, 2012
Thumb and Sinew
Ten days ago I ruptured my left thumb extensor tendon. I have Rheumatoid arthritis and it was an attrition rupture due to the long standing tenosynovitis the tendon had to traverse to cinch up for its muscle, Extensor Pollicus Longus. Because of the shoals and pitfalls of the four inches of Rheumatoid tenosynovitis at the wrist level, instead of gliding smoothly on a sea of serenity, the tendon was secondarily softened and degenerate and liable to fray and split with little or no direct violence. I suddenly noted after lawn cutting I could not move the thumb out from my palm. Luckily we have been provided with two extensor tendons to the adjacent index finger. We only need one tendon, so a transfer of one of these tendons to replace the gap in the thumb tendon was done along with the removal of the erosive source. Now the index finger extensor muscle, Extensor Indices Proprius and its tendon will have to be taught to be a good little thumb extensor.Homo sapiens could never have spanned the head of Neanderthal man in order to bash it against a rock unless he could fully extend the thumb to reach an octave length. Homo sapiens could never develop fine and complex pinch and text unless he could lift the thumb out of the palm. Mankind"s opposable thumb is the singularity that has allowed the use of this early gift in the development of intellect! The sinews are the source of mankind's strength and complexity! We no longer have a hand that can only hook and clench,it can grip and pinch! Arborial becomes terrestrial!