Thank you for asking HCM
I have gone through your query.Your problem can be disturbance in extensor mechanism of knee or a patellar sublaxation.A physical examination with an orthopedic surgeon is necessary to rule out the condition.X ray
examination will be helpful.But if there is signs of meniscal or ligament injury MRI
will be needed.Braces will be helpful in patellar sublaxation or extensor disturbances.Physiotherapy
also will be helpful.Hope this may help you.
Let me know if you have any further query.