![]() ![]() We are in the process of looking at all of the nerves that drive those hamstrings. Hence, the tightness in her hamstrings limiting knee extension is positional, meaning that the hamstrings aren’t scarred (a contracture), but just “freaking out” in one position. However, when lying face down, the knee had no issue straightening. ![]() I observed this as well, as when she was lying face up, her knee couldn’t straighten. However, in her case, she reported that a massage therapist she knows could work her hamstrings and get the knee straight. As I showed above, this was overloading and tearing up her quadriceps and patellar tendon. I had a patient visit our licensed Grand Cayman clinic from the middle east whose one knee wouldn’t straighten fully. A posterior cruciate ligament that is scarred or too tight.Chronic tightness in the hamstring muscle.Scarring of the joint capsule after knee arthroscopic surgery (aka arthrofibrosis).Do it for months or years and those tendons will get torn up and the back knee cap will lose cartilage. Do that for any length of time and the quadriceps tendon, knee cap cartilage, and patellar tendon will begin to get too much wear and tear. Why? They are actively working to support your body, just like in the picture to the right above. What do you notice? First, not many of us can stand this way for long, as our thigh muscles will begin to burn. Try standing right now and bending your knees slightly. However, when the knee won’t extend fully, the hamstrings are short and the quadriceps muscle is active. If you look at the images to the left, when standing with full knee extension, both the hamstrings muscles in the back and the quadriceps muscles in the front are, for the most part, shut off. So 10 degrees of extension lag means that the knee is bent 10 degrees in flexion and won’t extend any further. When you can’t fully extend the knee, we doctors call that an “extension lag”. Learn about Regenexx procedures for knee conditions. ![]()
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