Injury to the anterior cruciate ligament (ACL) in the knee is really more than just a torn ligament. Along with damage to the ligament comes weakness of the quadriceps muscle. The quadriceps is the large muscle that comes down over the front of the thigh from the hip to the knee. Scientists are trying to unlock the puzzle of this muscle weakness. The muscle isn't wasting away, a condition called atrophy . So what could be causing this weakness? Is there some way that the ligament signals the muscle to contract in a normal knee? What other changes occur after a ligament is torn or damaged that could affect the muscle? Researchers at the University of Tokyo in Japan set out to answer these questions. They found signals that form a complete loop from knee joint to ligament to muscle. This is called afferent feedback . Before the experiment, scientists thought that damage to the ACL alters this loop. Decreased signals to the muscle cause the weakness. To prove this, they used vibration to the ...
For the past 3 months i have been getting weird sensations in my head. Like my head is freezing. Also i get sharp stabbing pains on both sides of my head and at the back of my head. Then also pressure on temples and the front section of head with my nose bone paining and my cheekbones. I have no nausea or vomiting. I am very concerned. Please help, Wendy.
We'd love to help, but as much as we'd like to help and answer your question, nobody can diagnose and answer questions such as yours online. The only person who can safely answer your question is a doctor who can review your and your family's medical history, discuss your symptoms with you, and conduct a complete examination.
Unexplained symptoms such as those you're experiencing should always be checked out. Please see your doctor.
Good luck, John Claude Krusz and Teri Robert
If you need help fin...
I just started having sharp stabbing pains of the left side of my head just above the left ear. It feels like someone is stabbing with a sharp object and is very painful. It doesn't last too long. Sometimes I get them one after the other and sometimes it goes away and them comes back, but right after this happens I get tingling all over my left check and then going down to the jaw are.
I've have this now going on 3 days. Today the jabbing is going to my forehead mainly on the left side. I'm very worried. Thanks, Rose.
This isn't a question that anyone can safely answer via the Internet. It needs to be addressed by a physician who can review your medical history, discuss your symptoms, and examine you in person.
What you describe could be ice pick headaches, but we cannot say if it is or not. You can find some information in Ice Pick Headaches - The Basics .
You should knowAnswers to your question are meant to provide general health information but should not replace medical advice you receive from a doctor. No answers should be viewed as a diagnosis or recommended treatment for a condition. Content posted by community members does not necessarily reflect the views of Remedy Health Media, which also reserves the right to remove material deemed inappropriate.