Bill Hartman 3:25–6:26
And those are handy. But again, they're certainly not a measurement of symptoms, right? So we always have to take that into consideration as well. So let's think about what you've got going on here. You've got a guy that's got to produce a lot of force. So he's going to live near or in internal rotation all the time. The question is, how does he produce that? Chances are, the higher the force production, the less relative motion you're actually going to utilize. And so that would be normal under his circumstances. So you should expect to see anti-rotation in the pelvis. You should expect to see changes at the ankle and foot. You should expect to see concentric orientation of musculature that produces internal rotation, especially at the knee. Vastus lateralis is going to be concentrically oriented. Short head of biceps femoris is going to be concentrically oriented. What you want to make sure though is that you've got enough, and again, enough is the question mark when you're looking at performance, that you've got enough of the external rotation to capture positions and enough of the internal rotation to reduce force, and that becomes the question mark. So when you start looking at the knee itself, how close to a heel-to-butt measurement do you have? So that's going to give you an idea of how much tibiofemoral internal rotation you have. So you have normal knee bending. So if you have a situation where say you have a femur that is internally rotating to produce force into the ground and you've got a tibia that is remaining in external rotation, you have a mechanical disconnect, so to speak, as far as where you want those knee mechanics to be to produce force. So if I have a tibia that's going external rotation and a femur going internal rotation, you've got a patella that's going to get pulled laterally, which it loves to do, because that's where it came from. So if you have those circumstances, you have a mechanical circumstance that can produce aberrant mechanics during force production. Whether it becomes symptomatic or not, that is duration of symptoms, how severe are the pressures and tensions that are related, and then what is the perception. So again, those are all in play. But from a mechanical standpoint, you want to make sure that you've captured enough of the tibiofemoral internal rotation so that when it does come time to put force into the ground, he's doing it with, I don't want to say balance of forces because balance is variable, but sufficient downward force through the joint versus say a situation where you've got more load on the medial aspect of the femur. And you've got again the concentric orientation of say vastus lateralis that's pulling patella off center. And again, you're going to have a situation where you're going to increase the compressive load of the patella against the femur. Under normal circumstances, there is a higher pressure of the patella against the femur. The question is, is it distributed enough that that's no longer symptomatic? So if you look at the patellofemoral pain research and they always talk about how, oh, the pressure of the patella increases as you go into a deep squat. It's like, well, yeah, it's supposed to, but it's usually very well distributed. But if you have a situation where you've got this rotation across the knee, now you have a focal load that number one, if you think about this, squeeze the blood out of a patella, it hurts. You get an ischemic response in the patella itself. So people come in, they say, oh, my knee feels cold. Or they feel, again, the focal loading strategy. If you've got any imaging, you'll see histories where the cartilage will start to thin in certain areas on the posterior patella. But the thing that I would encourage you to do is to try to give him enough relative motion so he can capture these positions and learn how to distribute load versus making it focal with the understanding that it's probably not going to be a normal situation. Right, and again when you're working with superheroes, it's not normal. Right, you don't want normal because normal people don't run fast and jump high, right? And so you get to know this person over time by collecting data, you intervene to the best of your abilities, and then you monitor these things. But I would say that typically you're looking at some mechanical issues that may predispose some of this load to become more focal. And if you can distribute those, then that's great. You sent me some pictures of the hip internal rotation measures. So be aware as to where those measurements are taking place, okay? So if you do a prone hip internal rotation measurement, what is the position of the hip under those circumstances? So if you've got a pelvis that is anteriorly tilted on the table, I can guarantee you that you've got an orientation into external rotation as you're taking that measurement. So it would be much like watching someone squat and having to move their knees apart and toe out. Okay, so they're capturing a position of external rotation space so they can move into that. And then they produce internal rotation from there. So if you're measuring under a similar circumstance, take that into consideration as to where you are capturing that internal rotation measure. Because if it's not in line with the axial skeleton as would be a standard measure, then you need to be as consistent as possible with how you're measuring. So you know when you're making a favorable or an unfavorable change.
knee mechanicship internal rotationforce distributionpatellofemoral paincompensatory strategies