This question can best be answered only after you have visited a specialist, but if you suffer from following, you may be helped with surgery;

• Pain in knee joints, more on activities like climbing stairs, walking on level ground.
• Pain in arthritic joint which disturbs your sleep.
• Pain which does not allow you to walk even short distance.
• Deformity of joint.
• Stiffness of joint.
• Instability of joint.