Conor McGregor's DEAD LEG Leads to Knockout at UFC 257 - Doctor Explains BRUTAL Leg Kicks!
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Conor McGregor was knocked out by Dustin Poirier at UFC 257 after a flurry of brutal leg kicks caused McGregor's leg to go dead and weak. Poirier ultimately won by knockout to defeat McGregor, but the leg kicks were really the star of the show to help give Poirier the victory. In this video we'll review the leg kicks and explain the anatomy that makes them so effective in MMA!
EDIT 4:45, these are NOT dermatomes. Dermatomes come from the spinal nerve root levels, these are just the distributions from sensory peripheral nerves.

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I'm a doctor and a sports fan and this channel is dedicated to exploring the unique medical side of the world of sports, including NBA, MLB, NFL, UFC, and many more! Breaking down the biggest what ifs, historical injuries and stories, and making learning about medicine fun and relevant for all sports fans!
Anatomy images:
DISCLAIMER: Content not intended to be taken as medical advice. Opinions are my own and do not represent those of my employer. I have not personally treated or evaluated the individual(s) discussed in this video. Content used with educational and transformative intent within Fair Use Guidelines
Content owned and produced by Brian Sutterer LLC 2021

  • Brian Sutterer MD
    Brian Sutterer MD

    Will the UFC 257 performances be enough for Khabib to come out of retirement?? EDIT: 4:45, I mispoke in the moment, these are NOT dermatomes. Those are related to nerve root levels and not peripheral sensory nerves, which is what I am actually showing in the video. Just a difference of describing the cutaneous innervation from the sensory nerve (pictured) or the nerve root (L4, L5, etc) Also, bonus points for those that caught my orange/green background colors

    • Thomas Dauphan
      Thomas Dauphan

      If it was not the leg it would have been something else b/c McGregor has never developed his abilities..... Professional Prize fighting at the Championship level is about Patience, Thinking under pressure & ADJUSTMENTS....... Of course mastery of fundamentals, technical skills & pure talent are Crucial but at the Highest Levels - Championship Level - these factors are given or the fighter would never be in a Main Event Conor simply does not possess these mental skills & that is why since he has moved to his Real weight class where opponents are the same size & he can no longer bully opposition he has been exposed as a one dimensional fighter who falls apart when his 1st round onslaught fails to work This was very obvious even when Conor was winning early in his career, Conor sets NO traps, there is No clue to his tactics in terms of tricking opponents by baiting them early in order to set something else up later in the fight & this is why Poirier was a perfect opponent to underline how stagnant Conor has been for Years now In short, Conor is the Exact same fighter he was years ago when he was fighting lower level or younger inexperienced foes & he could get away w/ his short cuts Poirier has developed beautifully since then, his footwork is outstanding, he is Always in a strong base w/ feet wide apart & his chin - even when he throws punches - is Safely behind his lead knee - this allows Dustin to always have a backdoor to escape or counter & b/c his technique is so good, even if he does get hit, his chin is not flying forward over that knee multiplying the power of McG's punches Think of baseball when a pitcher is throwing a 100 mph the batter just needs to make contact & the ball explodes off the bat - when your technique is poor & you are throwing power punches & an inexperienced fighter is emotional trying to get that extra on the punch his chin flies out way past his lead knee Conor being an excellent counter puncher always slips that punch or what is called a Pull Counter in Boxing, all your opponents weight flies forward on to his lead leg & his chin is in the kill zone so you merely need to Pull your head back to slip the punch & Counter and his own momentum basically KO's him on your nice, easy counter punch Remember when Conor 1st entered the UFC very few MMA fighters had any Boxing training - the Diaz Bro's were among the very few & they were devastating in stand up b/c of it - so was Conor Most MMA fighters would learn kick boxing fundamentals which are some killer techniques but kickboxing focuses more on Offense, the entire art of Boxing is about Avoiding contact through the use of proper footwork & movement that requires Perfect balance in order to avoid danger, maintain balance while Delivering violence & its one of the hardest things in the world to master Dustin has done a great job of Improving his Defensive abilities in stand up by using basic boxing fundamentals of footwork & even early when Conor was landing, Dustin was more often than not able to dampen the force of McG's power proper fundamentals And b/c Conor's fundamentals are So bad, he was often in a position where he was completely vulnerable to Poirier's counter offense - kicks, punches, take downs..... it was all there for Poirier b/c an increasingly frustrated McGregor began winging w/ jaw right there in the kill zone like a prize, his balance was off making him susceptible to the take down & his momentum from over punching left his body wide open for Dustin to use the calf kick.... Essentially, Poirier just took advantage of what Conor gave him He was patient, made adjustments on the fly & clinical in his total domination of Conor. Conversely, McGregor's only "Adjustment" was to continue to do the wrong things just Faster & we have ALL done this w/ something in out lives..... Its kind of like banging the TV or AC if its not working, or throwing a thing across the room if we get frustrated So while I luv the Doc's breakdown of the calf injury, Dustin would have won this fight in any numver of ways b/c he effectively neutralized Conor's One dimensional Offense..... For example, Dustin was timing Conor's favorite right, jab, straight Left, right hook combo by throwing a check hook from the south paw stance as a Counter punch - Dustin's Own Pull Counter of you will & he was landing it over & over again b/c Conor never adjusted & kept walking right into it, Dustin also used that great footwork to put him in a position to take Conor down after slipped Conor's punches In other words, because Dustin's footwork fundamentals were so good, he was able to slip or dampen Conor's Offense & Still be in a perfectly balanced position while Conor was flailing wildly & off balance & this left Poirier in a position to Choose Any one of several counter Offensive moves - in short, he could just pick off the menu - right hand check hook pull counter, inside calf kick counter, single or double leg take down off the counter In other words it did not matter what happened, Poirier was winning that fight b/c Conor has not developed his craft & Poirier has

    • Valter Duarte
      Valter Duarte

      ❤️ ❤️

    • Ramiro Duran
      Ramiro Duran

      Brian, his leg was dead and now his brain is dead...brain damage. Poirier did not win this fight, he is not better than Mcgregor. Mcgregor lost this fight himself by taking unnecessary hits/damage just to show off his tuffness.

    • Marty Collins
      Marty Collins

      Sure would b better if u quit making up words... Kicked him in the skiddly bop near the duggy bump nerve... All I wanna know is who learned u?

    • Roblox Ceedayꪜ
      Roblox Ceedayꪜ

  • Imocros TV
    Imocros TV

    Who else got sent here by Joe Rogan?

    • Imocros TV
      Imocros TV

      @Brian Sutterer MD yes, there is a 11 min clip on UZload from 2 days ago mentioning this breakdown.

    • Brian Sutterer MD
      Brian Sutterer MD

      From a recent pod?

  • Cxmpz_49ers

    i dont get why people dislike like he didnt do anything

  • Naif Ksa
    Naif Ksa

    Doctor how long does it take to recover from calf kicks ??

  • H Hill
    H Hill

    Watching the foot drop after effect of calf kicks is always wild

  • wardy2c

    His leg really was a bellewn 🎈

  • 3knwest Os
    3knwest Os


  • Neil Buckard
    Neil Buckard

    His drive and hunger has been dampened by the money and fame if he fought chandler now he wouldn't last a round cos hes hungry for the fame money and stardom connor needs to pick his next 2 fights very cleverly otherwise another loss he will fade into a has been

  • Neil Buckard
    Neil Buckard

    I really feel he will lose the triology with dustin and nate at this time

  • Neil Buckard
    Neil Buckard

    Too much money takes away the hunger

  • Neil Buckard
    Neil Buckard

    Connor has his fingers in too many pies hes lost his way in ufc through too many distractions sad but true

  • Benjamin Austin
    Benjamin Austin

    What program is that. It looks amazing

  • Nico Mie
    Nico Mie

    Hehehehe no komen its only hehehehehehehe.....

  • FarFaLL3n On3 Xbox AWC
    FarFaLL3n On3 Xbox AWC

    Play ufc game. Kick spam wins. Stupid af

  • Zack

    yeah im sure he doesn't make enough money being a doctor, hes also gotta have paid sponsors in his UZload videos.... hopefully hes not living paycheck to paycheck now...

  • Mara Thomas
    Mara Thomas

    Hey Doc do you think having a reasonably bigger calf would be better or worse for taking calf kicks?

  • Azizjon Juraev
    Azizjon Juraev

    😂 if you take that, every part of human can get hurt, you have to fight smart to don’t get hurt. Cause always one guy winning the other is loosing. Special when you are rich than Dana White and will think it’s ok to let get hurt, I can buy new leg 😂

  • Headkick Ko
    Headkick Ko

    I always go for the lower legs first. I just put everything I have in the first 2-3. Once the tingling sensation starts, its already to late, damage done.

  • Beth Presley
    Beth Presley


  • David Limardo
    David Limardo

    Too much Proper 12 did it...!!!!!!😁😁😂🤣😂🤣😂🤣😂🤣😂😂😂😂🐖

  • The Ultimate Champion
    The Ultimate Champion

    Why the dislikes?

    • ricky j
      ricky j

      Butthurt Conor fans

  • QbanWay 88
    QbanWay 88

    Now its going to be the leg kick strategy era in UFC. Everybody targeting the legs. Remember the past? When they just fought with no rules apart from the basic ones..... The sport is becoming a strategic science war

  • New Age Cinematics
    New Age Cinematics

    justin did exactly what he had to do, mad respect, i love connor McGregor but that dude really got so much better! he took the leg tactic from connor, which is smart, slow him down and don’t allow him to give those deadly kicks.

  • Sean Rodaway
    Sean Rodaway

    Why not just have legg kick fights like in elementary school?

  • Violent_Bebop

    Everyone's got a plan, until you get punched in the calf

  • Markus E
    Markus E

    Ass-kissing fangirls. Obviously this man also has a soft chin. Or not. Defeat comes to all. It was the leg kicks, the punches, and Dustin's overall better game plan.

  • Keith Mikell
    Keith Mikell

    Almost 1m views. Almost 500k subs. Congrats on your channel, Briain. Ive been here since the beginning. Im happy to see you grow like this. Also, what do you think about these kicks and long term damage to the knee and other structures? Do you think they are too debilitating? Should they be looked at? This is coming from someone who has had 5 knee replacements and revisions. I know pain. It sucks. CTE sucks too, but you only get one set of wheels too.

  • Ænima-niac

    Loving your breakdowns doc! there was another baaad UFC injury in November. Ramiz Brahimaj had his ear torn almost completely off from a strike, I'd love to hear how permanent an injury like that could be. Keep up the great work 🤜🤛

  • MrKiddDiamondsTV

    Nerve is no joke!

  • hyte dude
    hyte dude

    King of ufc conor Mcgregor ❤👑

  • Emmet Turley
    Emmet Turley

    Those low kicks should be banned.

  • M CJ
    M CJ

    Just got over same injury, it fucks with the whole leg.

  • Mukit Khan
    Mukit Khan

    His not a doctor he works for mc nuggetts

  • Ben Keeley
    Ben Keeley

    “Conor would have won if it wasn’t for the leg kicks and the knockout” - Mcgregor fanboy logic

  • brent

    Can you please explain 'ballo0n foot' next? Thanks!

  • Joe Were
    Joe Were

    I love the minor detail of the skeleton always wearing a different shirt for the sport

  • Mauricio

    I was kick there while playing football in school, the moment I got kicked I dropped down, I couldn’t stand on that leg super painful, and my leg remained constrained for a month. I couldn’t stretch my leg.

  • Fancy Animal
    Fancy Animal

    He got kicked in the side of the shin and it went numb. Any questions?

  • Kique Vega
    Kique Vega

    Breaking News McGregor getting hit repeatedly in a fight leads to McGregor losing said fight via KO

  • Doc 23
    Doc 23

    When I was a kid we used to knee each other in the side of the thigh and yell "DEAD LEG!" as a joke. The Indian sunburn and smiley face burn were also used regularly to inflict pain on each other. Boys...

  • Slickster481

    How could you even stand with a dead leg or calf? He lost and that is no excuse. Bunch of bullcrap

  • Olbap Rabocse
    Olbap Rabocse

    It wasnt the calf... It was the ego lol

  • Zulfiqar Ali
    Zulfiqar Ali

    McGregor is wild horse Dustin was no where near his kick was not has power to hurt It was not McGregor day Dustin is champion end of day

  • DZ Malekvali
    DZ Malekvali

    Of tour cat is vegan, then Iam in. If not I have my steak medium please

  • not 4x3ry
    not 4x3ry

    That is not how I thought those cabinets should look😂

  • b harper
    b harper

    Lets forget about punched in the face

  • kolim jone
    kolim jone

    I found your channel after the KC game. I really enjoy your break downs of injury's it really helps to understand the servarity of what happened.

  • Love Wolf
    Love Wolf

    Powerful leg kick.I may be wrong but I think it was first used by Muay Thai fighters.

    • kolim jone
      kolim jone

      I'm so glad I found this channel

  • Felipe Albuquerque
    Felipe Albuquerque

    What a amazing explanation!!

  • Bimbambu tV
    Bimbambu tV

    Let's go vegan

  • phoolishbwoy

    Basic anatomy seems to be missing in these brain dead populous. Shouldn’t this be common sense?

  • RAB 0551
    RAB 0551

    This explanation made me wince...ouch ya fucker

  • anas rahim
    anas rahim

    Whatssup Doc, great content. Thanks 👍

  • sehhi vooty
    sehhi vooty

    My ex-wife always kicked me on the outside of my lower leg. I thought it was pretty weird that she wanted an anatomy book for our first Christmas together.

  • Bat Fink
    Bat Fink

    What in can't fathom is how many fighters can continue fighting after receiving far more lower leg kicks.


    mcgregor kicked the crap out of diaz leg in part 2 and still went after conor all the way the 5th round lol

    • sehhi vooty
      sehhi vooty

      This guy isn't even a proper doctor


    *me leg is dead

  • Jeews Sam
    Jeews Sam

    I never knew leg kicks are this damaging, this goes to show even in a street fight you would rather keep space and have a good slam at the leg than to wildly swing to the face

  • luis santos
    luis santos

    Hey doc, you should have been a fighter ...

  • Idang Jayalaksana
    Idang Jayalaksana

    It means that Poirier's fighting technic was right it caused damage, any reasons said but we knew Poirier finally won the fight. Respect the winner.

  • Flpdragonslayer Smith
    Flpdragonslayer Smith

    Dam that food looks good. And great breakdown on the human anatomy.

  • Miguel Angel Santiago
    Miguel Angel Santiago

    Long story short..... He lost

  • Alexander Harding
    Alexander Harding

    You can see Conor McGregor in the back his body’s dead 💀

  • David Carranco Zepeda
    David Carranco Zepeda

    I'm so glad I found this channel

  • Alexander Orantes
    Alexander Orantes

    I bet this dude prob celebrates when conor fights win or lose lol

  • Zachary Torres
    Zachary Torres

    His calf was a factor but his cardio was also really bad. They should run it back though.

    • Cheefah

      It was legit, there needs to be a title fight without Mcgregor because Mcgregor only has one win at Lightweight so why is he relevant at Lightweight?

  • Landon Ellis
    Landon Ellis

    I hurt this nerve over ten mouths ago and I still have hardly any movement out of my foot

  • laskin riubn
    laskin riubn

    I see an upload from the doc, I watch. Simple.

  • nicolas echeverria
    nicolas echeverria

    Such a cool vid, thank you.

  • Tomek Pawłowski
    Tomek Pawłowski

    I think you have this salt lamp from Wieliczka

  • malayman

    Conor should learn from khabibi how to react when opponent kick the calf muscle, to neutralize damage

  • kevin

    This guy isn't even a proper doctor

  • Domdom Gaming
    Domdom Gaming

    man i a fan of him i just wanna know is he still able to fight again

  • bruno de lucas marques nygård
    bruno de lucas marques nygård


  • Svenn31

    i feel smarter just by listening to him talk 🤓

  • Mohammad Kamal
    Mohammad Kamal

    After the match with Khabib your skull also died dear Conor !!! hahahahahaha......

  • hjfjekekeke skekwkk
    hjfjekekeke skekwkk

    This is why Muay Thai is brutal.

  • Brian Andres
    Brian Andres

    Zzzzzzzzzz ahhahahaha


    Forget watching your opponent’s fight videos before facing them, watch this doctor’s videos on his breakdowns of the human anatomy that way you know where to target your opponent

  • Rufus T. Firefly
    Rufus T. Firefly

    What about Mcgregor’s dead head?

  • TitoSilversRayleigh

    Sounds like what happened to Paulo "Ricky Martin" Costa.. After Stylebender damaged the right leg via kicks

  • Wimo Tapia
    Wimo Tapia

    This is definitely prove to those that compares Conor with O’maley that they are nothing alike. Conor accepted that calf kicks lead to him getting finished. Sean O’Malley is still undefeated in his mind.

  • aap ramdani
    aap ramdani

    gw ngebayangin kalo conor lawan justin gaetche...bukan cuman bertatih tatih jalannya tapi bisa jadi lumpuh..ha"..dustin aja yang tendangan nya begitu dah gempor apalagi kena tendangan justin bisa modar ni orang tengil..ha"

    • aap ramdani
      aap ramdani

      @cnmmd qiuoo you understand what i mind

    • cnmmd qiuoo
      cnmmd qiuoo

      Doc looks like Joe from You

  • Jakob

    wow.. that is just tacky.. nothing insightful yet and then he tries to drop a commercial down your throat after 1½ min. 1:39 The lack of self-awareness and plain manners.. is literally unreal but meh US in a nutshell. Gotta be a culture difference, from a danish perspective... really find this dude unsympathetic. Imagine having such a speculative doctor with this lack of empathy for what is appropriate. whatever' rotten channel, your out but you channel holder would have a field day in some of the more red-light

    • cnmmd qiuoo
      cnmmd qiuoo

      Conor learned nothing from Adesanya vs Costa

  • RiVaL

    You should do a cejudo fight where his foot just didn’t seem to work. I remember seeing it live and wondering if he was ever gonna walk again😂

  • rexflexall30044

    So what you're sayin is Conner got knocked the fook out

  • 3 Hour Relaxing Music Club
    3 Hour Relaxing Music Club

    Conor needs to relax for other year. He might retired.

  • cnmmd qiuoo
    cnmmd qiuoo

    my calf is hurting now. conor will be back🇮🇪💕

  • Chris R
    Chris R

    I’m in med school. I should be studying for step 1 but I had to look at this and I can say I don’t feel guilty at all. Thanks for the lesson!

  • Violet Rose
    Violet Rose

    Conor is not a true mma fighter if he's not ready for the calf kick ... he is a boxer !!!

  • Vic Ribeiro
    Vic Ribeiro

    I wonder if there are similar nerves in the arms that can be attacked in a fight to "deaden" the arm? Anyone knows? If there are, which kind of strike would be best for attacking it?

    • Vic Ribeiro
      Vic Ribeiro

      @Abhishek Barshaan real helpful comment, thanks man...

    • Abhishek Barshaan
      Abhishek Barshaan

      Hit doze nutz

  • Terrance Adrian
    Terrance Adrian

    Excellent channel for people like myself, who are combat sports fans, to gain a perspective on common injuries fighters have to bear not only during fights but also injuries through training and sparring etc. Subscribed immediately! 😁

  • Alfredo Jarillo
    Alfredo Jarillo


  • Jinxo 2020
    Jinxo 2020

    Is this nerve on the outside or can you explain if it changes sides based on which leg it is. Trying to understand the disadvantages of certain fighting stances

  • Whoisadrn

    i tried kicking my brothers calf after this fight, i caught his knee with my calf and that shit fucking hurt all day

  • Speedyreedy1218

    Could those calf kicks have lead to an Achilles tear had the fight kept going?

  • Naghmana Riazuddin
    Naghmana Riazuddin

    Leg had too much whisky poured into! Hence muscle fatigue! Never see this impact so much on others! Why?

  • Everardo Andrade
    Everardo Andrade

    Great job doctor greetings from New Jersey 🙏🏻💪🏻

  • Joe Biden Wrestling
    Joe Biden Wrestling

    Conor learned nothing from Adesanya vs Costa

  • Luke Pearson
    Luke Pearson

    Doc looks like Joe from You