I'm no doctor but it sounds like you have a muscular problem or your tendon/ligament is mending. See your GP about it.
No, you should not straighten your leg after a knee subluxation as this action could further hurt your knee joint.
forever
no
The flexor would be the hamstring, and gastrocnemius, which bend/flex the knee. The quadriceps, are extensors, which straighten/extend the knee.
An IED
The primary function of the knee extension muscle is to straighten the leg by extending the knee joint.
To "extend" the knee joint means to straighten the leg by increasing the angle between the thigh and the lower leg. This movement is performed by contracting the quadriceps muscles on the front of the thigh, which pull on the patellar tendon to straighten the knee.
You cant get a cast on your knee
No...it cant! :)
IMPROVED ANSWER: You can't walk because your knee has been in the same position for six weeks. It will hurt as you straighten your leg. You should stretch and then start walking but not at the exact time!!!!
The muscles used to straighten the leg are commonly known as the Quadriceps, a group of four muscles on the front of the thigh. This, however, is only the cast when the knee is isolated. If you were to stand up from a squatted position, you would also be using your gluteal muscles as well as your hamstrings to extend the thigh and stabilize the knee, while your quads and inner thigh muscles (the adductor) help to straighten the the knee. You would also be using your calf muscles to straighten the ankle.
The quadriceps muscle helps straighten and extend the leg and the hamstring helps bend the knee.