sometimes in such cases,slight inflammation and muscle weakness are causes the problem of pain and muscle stiffness.
Next Steps
for knee go for physitherapy..ultrasonic therapy for healing,tens for muscle relaxation and wax therfapy for reducing inflammation may required . take rest. then the exercises by the therapist are to be done and very much important.
Health Tips
at home: give rest to the knee,avoid full weight bearing to the injured knee and hot water fomentation and some painkiller gel are temporarily helpful.