Hello and welcome to the Zero to Finals podcast. My name is Tom and in this episode I'm going to be talking to you about Decorvanes tinoinitis.

And you can find written notes on this topic at zero definals.com slash decor veins or in the orthopedic section of the zero definals

surgery book. So let's jump straight in. Decorvane's tinoinitis is a condition where there is swelling

and inflammation of the tendon sheaths in the wrist. It primarily affects two tendons, the abductor polysis

longest tendon and the extensor polysis brevis tendon. Decorvane's tinoinitis is a type of repetitive

strain injury and results in pain on the radial aspect or the lateral aspect of the wrist.

One notable cause of bilateral de-curveinstinocinovitis is in new parents repetitively lifting newborn

babies in a way that stresses the tendons of the thumb. For this reason, it's sometimes referred to as mummy thumb.

Let's talk about the basic anatomy and pathophysiology. The abductor polysis longus

acts to abduct the thumb and abduct the wrist. The tendon inserts into the base of the first

metacarpal bone at the base of the thumb.

The extensor polysis brevis also acts to abduct the thumb and abduct the wrist. The tendon inserts

into the base of the proximal phalanx of the thumb. Tendenten sheafs can surround tendons. A tendon sheath is formed by connective tissue,

specifically synovial membrane, that covers the tendons and is filled with synovial fluid.

The tendon sheaths help to lubricate and protect the movement of the tendons within them.

There is a structure called the extensor retinaculum,

which is a fibrous band that wraps across the back or the dorsal side of the wrist.

The abductor polis longus and the extensor polysis brevis

pass underneath the extensor retinaculum.

Repetitive movements of these tendons under the extensor retinaculum results in inflammation and swelling of the tendon sheaths. Let's talk about

the presentation. Patients present with symptoms at the radial aspect of the wrist near the base of the thumb.

Typical symptoms include pain, often radiating to the forearm, aching, burning, weakness,

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