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<v ->Now, if we look at sites of stenosing tenosynovitis

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which I will do,

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we're gonna go through a few fairly quickly

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just to show you some examples.

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This is an example that you should know well.

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It's De Quervain's, it's a stenosing tenosynovitis

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of the first extensor,

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a compartment of the risk involving

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the abductor pollicis longus

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and extensor pollicis brevis.

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It's a fairly frequent syndrome.

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It leads to pain, swelling,

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it may be associated with tendon tears

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and a higher frequency of accessory tendons

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within that compartment.

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And the findings that are associated with it as shown here

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are bone proliferation and marrow edema,

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and sometimes even erosion of the radius.

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So this is De Quervain's.

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Here's another example of it.

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You can see the tenosynovitis.

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You can see the two tendons, the abductor much bigger

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than the extensor tendon

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and the fluid.

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And in this particular case

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there's not much going on in the bone.

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Trigger finger, and I don't know how many of you

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have seen cases of trigger finger.

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What it is is a stenosing tenosynovitis

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with adhesions developing between the tendon and sheath

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typically at the level of the A1 pulley.

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Most common sites of involvement

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are the ring finger and the thumb.

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I'm showing you an example of involvement

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of the thumb in the area of the A1 pulley.

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There is extensive tendon enlargement,

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and even some inflammation

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and probably a nodule that's present here.

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And the A1 pulley was thickened.

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Patients who have this particular syndrome

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will have locking, often clicking, abnormal noises.

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And there's a fairly high frequency

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of this in the diabetic patient.

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There's another interesting stenosing tenosynovitis

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that occurs about the risk

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and involves the flexor carpi radialis tendon.

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Now, as you know this tendon has a complicated course,

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extends, it becomes intimate with the trapezium

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and then eventually inserts on the metacarpal base.

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When you have triscaphe disease,

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disease between the scaphoid and the trapezium,

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sometimes combined with disease also of the trapezoid,

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there is a high risk for injury

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involving the flexor carpi radialis tendon.

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It may be a tendon tear.

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It may be tenosynovitis,

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or always check that tendon

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when dealing with OA of the triscaphe space.

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And we'll talk about that in one of the lectures

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during this course.

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And yesterday I showed you,

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in fact this exact slide, to indicate what can occur

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with the hourglass biceps.

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This is really kind of a stenosing tenosynovitis

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involving the intraarticular portion of the tendon,

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which enlarges and becomes entrapped in the joint

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with elevation of the arm.

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In dancers, in the position on pointe,

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you may have problems

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involving the flexor hallucis longus tendon.

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You may have tendon tears or tenosynovitis.

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This is a rather important location

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and abnormality in the dancer.

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This tendon often called the achilles tendon of the dancer.

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Here's another example,

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tendinosis here in a typical location

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just behind the talus, in a dancer.

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And there are other tendons that may also

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demonstrate stenosing tenosynovitis.

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Another one is the tibialis anterior tendon.

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The typical location is distal

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as it approaches the medial cuneiform

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and base of the first metatarsal.