Fibula

00:01 Now let's continue our journey through the lower limb and look at the fibula.

00:07 So the fibula, as we've spoken to a little bit before sits on the lateral aspects of the leg.

00:14 It's got its sibling next to it the tibia.

00:16 And similar to both the tibia and the femur, which was spoken about before.

00:21 It has these three distinct areas of proximal end, a shaft and a distal end.

00:27 So let's have a look at this proximal end.

00:29 First of all, we can see now we have the head of the fibula and then that narrows down into the neck which ultimately gives rise to the shaft.

00:38 The head of the fibula, remember does not form part of the knee joint.

00:42 And here we can see it's forming a union with the lateral surface of the tibia.

00:47 And we've got the superior tibia fibula joint.

00:51 There's not that much movement that occurs here, we've got the superior tibia fibula joint.

00:56 So now let's have a look at the shaft of the fibula.

00:59 And for this we'll actually bring in the shaft of the tibia as well and we can see on the diagram on the right hand side.

01:05 What's actually done here, so it's important to orientate ourselves.

01:08 Is it we've made a cross section and then we're looking at this cross section as if we were looking distally.

01:14 So we're looking at this cross section as if the person is laying on their back.

01:18 And we are looking at the distal aspect of this cross section.

01:24 So what this means is pointing up towards the top, we have the anterior aspect.

01:28 And then towards the bottom of the screen, we have the posterior aspect.

01:32 So what we can see here now is the fibula in cross section, we can have this anterior border, we've got a posterior border.

01:38 And then coming away from this medial border, we have an interosseus membrane that runs towards the tibia.

01:45 This gives rise to three surfaces.

01:47 So we have a medial surface, a posterior surface, and a lateral surface that runs between those three landmarks I mentioned.

01:56 If we then move to the distal end of the fibula, we can now see we've got that lateral malleolus.

02:02 Lateral malleolus of the fibula combining with the medial malleolus of the tibia to form that ankle joint where we had a superior tibia fibula joint superiorly we now have a second one inferior down within the distal aspects of the fibula, and this is the inferior tibia fibula joint.

02:21 Again, there's not that much movement within these joints of the tibia and fibula.