Frozen Shoulder: 1. Anatomy
Dr. Michael Buna, an educator and chiropractor, identifies specific parts of the shoulder joint anatomy, in preparation for the next two videos that detail how frozen shoulder (adhesive capsulitis) develops, and treatment options for dealing with frozen shoulder.
Video Transcript: Frozen Shoulder: Anatomy
Good afternoon. Today we're going to talk about frozen shoulder. And the first part we're going to do is we're going to talk about anatomy, so you understand the names of the things I need to label for you guys.
So in the shoulder and frozen shoulder, you always hear about the rotator cuff. “They’ve got a rotator cuff injury.” What is a rotator cuff? Well it doesn't really describe much, it only describes four muscles. So we’ve written them up over here. We use the acronym SITS. It stands for Subscapularis, Supraspinatus, Infraspinatus and Teres minor.
Here's a picture of your back, where your shoulder blade is, the hard bone. And on this bone is a thing we call the spine of the scapula. So the supraspinatus lives up here. The infraspinatus lives below the spine. The subscapularis lives on the other side of the shoulder blade or on the front of the shoulder blade between the bone and the chest.
And the last one that Teres minor. It hooks on here and hooks on to the bone here which is the humerus – the arm bone.
But I also want to talk about a couple of other things. This is your arm, these are your fingers. There's your bicep. There's your triceps. There's the tendons for each of them and that's going to be important in a few minutes. All right.
And the other structure we want to talk about, is a structure called the capsule. And the capsule is a bag of fluid that holds fluid in all the joints in our body. So we have finger joints that have capsules on them, toe joints, knee joints. All the joints have capsules and it holds the synovial fluid in them. The synovial fluid is there to lubricate the joint.
Now in the shoulder, the capsule is a little bit different than anywhere else in your body. In the shoulder the capsule is hooked on like this, and it is hooked on here but it sags down like this. OK. So it's sagging all the time to allow us to do this action. Which is abduction - so you steal from the middle, that's what abduction is.
Now. There's another structure we have to talk about. And he lives right here and he’s called the subacromial bursa. And then, on the other side on the front of the shoulder is the subcoracoid bursa. And those are the structures in the shoulder we're going to need to learn about today.