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ACL Injuries

November 7, 2016

ACL injuries. We hear about them a lot, but here is an explanation of how they actually happen.

 

The knee is believed to be one of the most stable joints of the body because of its relative

 

size to other joints. The knee can withstand very large compressive forces, but shear and twisting

 

forces are not the knee joint’s best friends. The knee joints consists of three bones, the femur,

 

tibia, and patella, which form the patellofemoral (PFJ) and tibiofemoral joints (TFJ) protected by

 

the medial collateral ligament (MCL) from excessive medial movement of the knee, lateral

 

collateral ligament (LCL) from excessive lateral movement of the knee, anterior cruciate

 

ligament (ACL) from excessive anterior movement of the tibia in relation to the femur, and

 

posterior cruciate ligament (PCL) from excessive posterior movement of the tibia in relation to

 

the femur….. I bet you did not even read all of that.

 

 

The highest rates for ACL injuries in the National Collegiate Athletic Association (NCAA)

 

sports have been reported for football, women’s gymnastics, women’s soccer, men’s wrestling,

 

men’s lacrosse, and women’s basketball, in their respective order. Through the first 7 weeks of

 

this NFL season there were 40 ACL tears, last year totaling 48, and the year prior totaled 45.

 

And that’s just the beginning, let’s not get started on concussions (possible future topic) and

 

fractures that often end player’s careers. Because of biomechanical and anatomical differences

 

in males and females, females are at a higher risk for ACL injury occurrence. Why, you may

 

ask? Let’s get the most difficult explanation out of the way first. Q-angles. What? Q-angles, are

 

the angles between the quadriceps muscle and the patellar tendon.

 

 

The greater the q-angle the greater risk of injuring the ACL. Due to females having naturally

 

wider hips while having a narrow stance, their q-angles are greater than the q-angles in males.

 

The second (and “easier” to work with) reason for ACL injuries is the imbalance of quadriceps to

 

hamstring strength. The ACL prevents your shin from moving too far forward in relation to your

 

thigh bone. The quadriceps muscles (quads for short) attach in the front and just below the knee

 

and their main function is to extend the knee joint (kicking someone in the butt). The opposing

 

muscles, the hamstrings attach in the back/side of the knee and below the knee and their main

 

function is to flex the knee (kick yourself in the butt). If the quads are too strong and the

 

hamstrings are too weak, we are creating an imbalance, which can result in a ligament tear. If

 

you love working the quads, don’t forget to also train your hamstrings. If you are an athlete or an

 

active runner, you need to train hamstrings, do your yoga poses, warriors, downward-facing

 

dogs, and sun salutations, and do proper warm up before working out, especially if your

 

hamstrings have “always been really tight”. If you have already tried yoga and/or stretching and

 

your hamstrings still feel very tight and underactive, let us know, we can apply a piece of

 

RockTape to activate the hamstrings this way. If that does not work, we will scrape the

 

hamstrings with RockBlades. Trust us, they work. We have all the tools your hamstrings need,

 

so do not be afraid to ask for them!

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