Right acute knee pain, burning and bruise- like feeling. whole kneecap is worse, along its bottom. stairs are very difficult to use, and it hurts any time i walk. had a negative x- ray.

Patellofemoral pain: Your symptoms suggest patellofemoral pain;the cartilage underneath your kneecap may be thinning or damaged and causes pain in the kneecap region, esp. W/stairclimbing, squats, lunges etc.Keeping the knee bent for a period of time can be uncomfortable.Isometric quad strengthening, hamstring stretching, nsaids and patellar stabilizing sleeve can be helpful.See ors if sx's persist.Gl!

Patellofemoral pain?: Based on your description of the problem, your young age, and a negative x-ray, i'm suspicious that your pain may be patellofemoral in nature. If this is the case, exercises to strengthen the quadriceps can be very helpful. An elastic knee brace may also help. Since the symptoms are acute, it is possible that you have a torn tendon or ligament. Ultrasound or MRI can be very helpful.