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The knee, like the elbow to some extent, is a hinge joint however not a basic one. The lower part of the thigh bone expands into the femoral condyles and the upper shin bone similarly broadens into the tibial condyles, the joint of these two enlarged areas forming the knee joint. The small bone on the exterior of the knee, understood as the fibula, is not associateded with weight bearing nor is in fact part of the knee joint, serving just as an attachment location for the muscles controlling the ankle, foot and toes. The knee features as a hinge dividing the leg, permitting the exertion of high levels of muscle propulsive force, the folding of the leg in bending and the shortening of the leg in stepping to enable reliable gait. [http://glossary.ckukoszalin.edu.pl/index.php?title=User:RodEmma2538 inside of the knee pain] 
  
The quadriceps muscles, the main thigh group, act to bring the knee into its locking position as the joint get closer to complete straightening or extension. The apes and monkeys are not capable of extending their knees in standing so this position takes high levels of energy, while complete extension plus securing of the knee joint enables standing without much effort. The knee joint is rotated inwards by the major quadriceps muscle as it gets near totally straight and begins to lock. Human upright position has advanced by this procedure to allow prolonged standing with very reduced energy expense due to the inactivity in the knee and hip muscles. 
  
The cartilages, frameworks referred to as menisci, are shaped like a banked track in a crescent configuration and fill in to some extend between the rounded condyles of the femur and the flat tibial surface. Their function has not precisely been demonstrated, nevertheless they might help in relieving the knee into lock, decreasing unacceptable motion of the condyles and bringing the condyles to the joint center in motion. The 3rd part of the knee joint is the patella or kneecap, this little bone being lined with cartilage and put anterior to the knee. 
  
The tendon of the quadriceps muscle holds the patella or kneecap within it, the muscle's primary feature being knee extension to raise the body from a chair or negotiate actions. The inner area of the patella, divided into two features, is lined with joint cartilage and articulates with the major groove between the condyles of the femur, sliding back and forth. The power of the quadriceps muscle to extend the knee against the body weight is considerably enhanced by the presence of the kneecap. 
  
The flexion and extension airplane is the natural airplane of knee movement as this regular placement makes knee discomfort problems take place less generally. A bow-legged or knock-kneed pose enables unusual sideways worries to be put on the knee, requiring pressure onto one side of the joint and raising wear stresses which with time could trigger pain symptoms or arthritic changes. Patellar misalignment can also take place, obliging one of its elements against the side of the femoral condyle groove and causing impingement discomfort due to enhance in the friction forces. 
  
Throughout motion of the knee the menisci (the knee cartilages) and the kneecap undergo high mechanical forces and are the reason of a number of usual knee problems. The motion variety of the knee is normally from straight (no degrees) to full flex at about 140 degrees, differing with the body size and joint flexibility. As the knee experiences the motions of extension and flexion the big rounded condyles glide and slide on the top of the tibia, with the tibial surface moving beneath them additionally.