Lower leg, getting there, getting there. Gone
a long way today, we're on like mild 24
of our marathon. All right we got to talk about the ankle a little bit, because
unfortunately is this word bank going to work for our ankle? No, now you guys already
know enough to know that the ankle has its own set of joint actions.
What type of joint is the ankle? It's commonly referred to as a hinge joint.
That's a little deceptive but the ankle is also two joints not one. So you have
this mortise is what it's called, it's like a mortise joint, that's another one
of those construction things right, where you have like a one of these shapes and
a tongue that goes into it that way. So you have the end of the tibia and the
fibula, the lateral malleolus of the fibula coming down and basically
blocking this part of your ankle joint into what plane? What plane can this
actually move? Sagittal that's it right, but alright so that's the tibiotalar ,a
talocrural joint. Then you have the subtalar joint which is your heel bone,
your calcaneus on the talus. Does the fibular or the lateral malleolus of the
fibula extend that low? No, so now what plane can this move in? Frontal it'll
rock this way. Alright so we have sagittal here and frontal here, subtalar
beneath the talus.
Tibia, fibula, talus, calcaneus those are kind of the bones that make up our
ankles. So we got some sagittal joint actions, and we got some frontal actions. Well I
guess I actually could kill two birds with one stone here, and just make our
word bank huh.
So what can my ankle do in the sagittal plane? Plantarflexion and dorsiflexion,
You guys are already way on top of it. Where do those terms come from, why isn't
it flexion and extension? And you guys are right dr. Falinger steals all my
stuff. Alright so dorsiflexion dorsal refers to top service, like the dorsal
fin on a shark. dolphin! We're hardcore in this room. we're gonna refer to dorsal
fins. It's going to be jaws, not some little dolphin. Shamu is a killer whale, it has
killer in the name so that's that's ok, that's it in between, does funny shows
but still a possible killer. Kills trick,
kills trainers, all right kind of kind of coo,l I guess kind of cool not as cool as
jaws, but more cool than a dolphin. All right so dorsal fin, yes I'm recording
this on video and that that whole thing is just going to look like a weird aside,
about my fascinations with fish that eat other fish, or in the case of killer
whales and dolphins, mammals and now I've proved I watch way too much Discovery
Channel. Alright so moving on we got dorsal fins top surface, flexion refers
to two bones getting closer together, in this case it's the dorsal surface of the
foot getting close to the tibia. Plantar flexion what is plantar refer to? The
underside. Now how we get plant our flexion not really sure other than the
calcaneus does actually come close to the tibia, your ankles more of a seesaw
than it is like your elbow You guys cool with that. I always think like plant
myself into the ground is plantar flexion and then dorsiflexion is coming
up. You guys got that, now in the frontal
plantarflexion as a rear is an actual word, it's just not used. Plantarflexion,
dorsiflexion, frontal is actually eversion and inversion and this is
subtalar joint actions. So eversion is what? Yes so eversion, well actually let's
start with inversion because this I have a little cue to help me memorize this.
Inversion is the sole of my foot facing inward. Inversion sprains happen more
often right. Why do inversion sprains happen more often than eversion sprains?
Okay if this is my left foot because the fibula blocks the talus, there's less
stability this way. Yeah if you hear of an e-version sprain, which eversion now
is the other way, foot flattening or beyond. If it goes beyond and you get
an eversion sprain what often happens?
Fibula fracture, not okay, not okay. Alright so we got inversion