The thigh bone is the longest and strongest bone in the body. The top of the thigh bone forms the hip joint and the bottom forms part of the knee joint. Pain behind the knee is often felt due to an incorrect seating posture. For example if you go on a picnic you may have to sit on the ground for a long time folding your knees at an awkward angle. While getting up you could feel pain behind the knee. The knee joint is bent by the hamstrings in a stretching motion at the back of the thigh and the calf muscles.
While we walk, the thigh bone or femur is slightly rotated and any inflammation in the muscles causes a pulling effect on the back of the knee causing a sensation of pain behind the knee. Ice and cold compression cause blood vessels in the tissues surrounding your knee joint to constrict. This helps to reduce the swelling and inflammation in the area behind the knee joint too.
To ensure that your knee stays stable and free from injuries it is necessary to keep the muscles supporting your knee joint strong and flexible. Weak muscles are one of the major contributors to pain behind the knee joints. So, strengthening the quadriceps, which are the largest of the muscle groups around the knee joints and the hamstrings (which help to straighten your leg at the knee), helps to avoid occurrences of pain behind the knee joint.
Keeping the muscles of your knee in balance is as important as strengthening the muscles to prevent extra strain on your knees and the surrounding areas, thus enabling free movement and avoiding pain behind the knee.
Jobs that put the knee joints under particular strain can lead to pain behind the knee. As we grow older, the condition of the knee joints begins to worsen due to the effects of general wear and tear on the joints. This could make the pain behind the knee unbearable especially when sitting in a cramped position for a long stretch of time. Strengthening exercises are recommended to tone up the muscles and connective tissues.
Some of the common treatments to reduce pain behind the knee include injecting medications to improve the condition of the connective tissues around the knee joint and micro surgery to repair minor tears in the muscles supporting the function of the knee joint.