Thanks for the query to H.C.M. Forum.
Since you mentioned that there is lump just above the patella
( knee cap ) , so it is very difficult to understand , where is it.
In my opinion this may be at the lower end of femur
so may be ,
, diagnosis can be confirmed by X ray and c t scan . Biopsy
is also an important diagnostic tool on the basis of clinical and radiological appearance . This type of tumor is usually benign in nature if not from long time.
2 Aneurysmal bone cysts
, diagnosis can be confirmed by clinical as well physical examination by an orthopedic surgeon.
3 Malignant tumor of bone , diagnosis on the basis of Xray , C T scan, physical , clinical examination by an orthopedic doctor.
In my opinion at once consult an orthopedic surgeon and get his opinion and treatment .