Hi, thanks for writing to HCM.
By your description of symptoms, I feel that you have the condition named CHONDROMALACIA PATELLAE
. This implies softening of the articular cartilage
of the patella (knee cap bone) & formation of fissures on the surface leading to roughness of the surface.
When this rough surface rubs against the smoother surface of femur
(thigh bone), one can feel the cracking noise especially while bending the knee.
The initial treatment is always conservative -
* Avoid impact sports
* Keep your body weight at optimum
in the form of active quadriceps exercises
as and when necessary
* Avoid extreme bending of knee
Hope this information helps