Hi, thanks for writing to HCM.
Based on the description of symptoms , I suspect a fracture
of the patella
( a dent in knee cap could be a fracture).
An xray is mandatory to diagnose the bony injury
to the patella.
In the meantime, follow the below mentioned general guidelines -
* Rest to the injured part and don’t involve in activities which puts additional strain on the injured tissues.
* Ice packing should be applied for about 20 minutes once in every 2 hours.
* Use elastic compression bandage around the swollen area
* Elevation of the limb
& anti inflammatory medications
Consult an orthopedic surgeon for a detailed evaluation and management.
Hope this information is helpful. Good day