knee--joint

“Jamie’s Thighs” or “Ode to Joy!”

So, to start this lesson, I’ll be having ye know a few more things about muscles and bones of the thigh and the knee otherwise some of this lesson is no gonna make sense! The hip and knee joints are sites where bones move relative to each other. Skeletal muscles attach to the participating bones and span the joints; the attachment site that is fixed (doesn’t move) is the origin of a muscle and the attachment site that does move is its insertion. Next, our brains direct these muscles to contract. If muscle contraction brings the bones of the joint closer together, this is flexion (the hip joint has other movements but they don’t concern us today). If muscle contraction straightens the joint, it is extension (Photo A). 

Photo A

Understand that anatomists don’t use the terms upper and lower leg. For the lower limb, the region between hip and knee joints is the thigh, the region between knee and ankle joints is the leg and the foot is the remainder (Photo B). The dashed blue line in photo B represents the vertical midline plane through the body. A medial structure is closer to the midline and a lateral structure is further away from the midline!  Aye, that’s the gist of it!

Photo B

Keep reading

phys.org
Lab discovers titanium-gold alloy that is four times harder than most steels
"It's four times harder than pure titanium, which is what's currently being used in most dental implants and replacement joints."

Titanium is the leading material for artificial knee and hip joints because it’s strong, wear-resistant and nontoxic, but an unexpected discovery by Rice University physicists shows that the gold standard for artificial joints can be improved with the addition of some actual gold.

“It is about 3-4 times harder than most steels,” said Emilia Morosan, the lead scientist on a new study in Science Advances that describes the properties of a 3-to-1 mixture of titanium and gold with a specific atomic structure that imparts hardness. “It’s four times harder than pure titanium, which is what’s currently being used in most dental implants and replacement joints.”

Morosan, a physicist who specializes in the design and synthesis of compounds with exotic electronic and magnetic properties, said the new study is “a first for me in a number of ways. This compound is not difficult to make, and it’s not a new material.”

In fact, the atomic structure of the material—its atoms are tightly packed in a “cubic” crystalline structure that’s often associated with hardness—was previously known. It’s not even clear that Morosan and former graduate student Eteri Svanidze, the study’s lead co-author, were the first to make a pure sample of the ultrahard “beta” form of the compound. But due to a couple of lucky breaks, they and their co-authors are the first to document the material’s remarkable properties.

Continue Reading.

The reason that we can sit like this even for hours and not fainting is due to the presence of  genicular anastomosis.eventhough our popliteal artery are blocked in this position,the ten branches of the anastomosis help to supply the blood to the knee area.

The branches are made of :
-superior genicular vessels
1)descending branch of lateral circumflex femoral av
2)descending genicular branch of femoral av

-popliteal vessels
3)medial superior genicular av
4)lateral superior genicular av
5)middle genicular av
6)medial inferior genicular av
7)lateral inferior genicular av

-inferior genicular vessels
8)circumflex fibular av
9)anterior tinial recurrent av
10)posterior tibial recurrent av

Ps:av = artery and vein

what should i do if my knee is still acting up?

my knees both hurt like hell after this week of squats and lunges, i’ve taken two days off because my joints were in so much pain. today the left one is fine, but my right one is still being a bit of a bitch.

i miss my squats and lunges though! argh. what should i do?

welp.

Lab discovers titanium-gold alloy that is four times harder than most steels

Titanium is the leading material for artificial knee and hip joints because it’s strong, wear-resistant and nontoxic, but an unexpected discovery by Rice University physicists shows that the gold standard for artificial joints can be improved with the addition of some actual gold.               

“It is about 3-4 times harder than most steels,” said Emilia Morosan, the lead scientist on a new study in Science Advances that describes the properties of a 3-to-1 mixture of titanium and gold with a specific atomic structure that imparts hardness. “It’s four times harder than pure titanium, which is what’s currently being used in most dental implants and replacement joints.”

Morosan, a physicist who specializes in the design and synthesis of compounds with exotic electronic and magnetic properties, said the new study is “a first for me in a number of ways. This compound is not difficult to make, and it’s not a new material.”

In fact, the atomic structure of the material—its atoms are tightly packed in a “cubic” crystalline structure that’s often associated with hardness—was previously known. It’s not even clear that Morosan and former graduate student Eteri Svanidze, the study’s lead co-author, were the first to make a pure sample of the ultrahard “beta” form of the compound. But due to a couple of lucky breaks, they and their co-authors are the first to document the material’s remarkable properties.

Read more.

Lardo headcanons to consider

-cracks all of her joints, shoulders, knees, ankles, etc. CONSTANTLY
-chronic hat stealer. if u have a hat, u will not for long
-conspiracy theorist. she will only talk about them when shes high, and theyll be the only thing she talks about when shes high
-she is korean drama t r a s h and she watches them with whiskey. neither of them speak korean.
-shes terrible at spelling & at grammar. her texts are salvaged soley because of autocorrect
-shes dated like half of the womens volleyball team and they all do the lesbian thing where theyre all still friends
-she fucking loves lizards. she loves lizards to D E A T H. she has a bearded dragon at home. his name is opal
-she can be super fucking petty tbh. she will lowkey hold a grudge for years and ud never know. and then when u least expect it she will remind u of how u fucked her over on november 21st 2013 at 10:30PM u fucking bitch
-she, like many art kids, is horrible at math. but that doesnt stop her from fighting holster about money & shit. ex: “what do you mean i cant buy eight slurpies they only cost 4 bucks” “lards, we only have 16 dollars” “so” “thats not how that works, man” “….i dont believe you”
-she can tie a cherry stem with her tongue better than any human should. its impressive.
-she only likes coffee if it has like 80 packets of sugar in it & its mostly milk
-she has the most effective side eye known to man. she could kill a man with her side eye. she also taught this skill to chowder. they are a menace, together
-speaking of chowder. on one hand, he is basically her soulmate and she loves him dearly, probably more than even bittle. and at the same time, he is very much like an obnoxious little brother, barging into her room at all times, interrupting her when shes trying to flirt with people, taking her stuff without asking, and generally being inconvenient
-also she gives him a lot of noogies
-she suspects very much that shitty has a thing for her and she also has a thing for shitty but also she doesnt like /know/ and if she fucks up she could lose her best friend probably ever and shes really in between a rock and a hard place
-but shes okay with what they have now, and she loves being his friend and if he wanted something different shed be okay with that too
-she just loves him a lot.
-but that doesnt mean shes going to wait around for him to make up his mind lmao there are a lot of hot people at samwell
-she keeps a hanson cd in her car at all times. yknow. for emergencies
-jack taught her how to ice skate and it was one of the cutest things hes ever seen in his entire life
-whenever she ends up needing to talk to someone, especially late at night, and it cant be chowder or shitty or bitty, its usually dex??? mostly bc hes the most straightforward person she knows. its this weird, mutual bond thing they have
-she attends every single one of nursey’s poetry readings. every. single. one.
-he doesnt know how she knows, but she just does and at first it scares him but now its just really comforting
-larissa duan cannot swim. she just cant. she sinks and she’s so short that she can only go in like the 4ft and when shitty finds out he buys her a cool doughnut inner tube and brings it whenever they go to the pool together
-she taught some of the hockey guys to make a pyramid when she was a tadpole and johnson was always the top. now it’s tango (lardo thinks he could have been a cheerleader if he wanted to)
-the only classic literature book she will willingly read is the importance of being earnest by oscar wilde
-she is fucking addicted to solitare
-she is just very loved and appreciated by all of smh they dont know what to do without her