Only other thing to add is the possibility of a DVT if seated in the same position for multiple hours.
This can express itself as pain behind the knee. Classicially the leg becomes swollen, reddens, and becomes hot. However not every clot reads the textbook.
Although I wouldn’t expect the pain to resolve once up and moving off the plane. This is more suggestive of arthritis in the knee. Classiclaly arthritis hurts when still, hurts more when you first get moving, then improves with additional movement.
A puzzle for your GP or possibly an ortho.
This can express itself as pain behind the knee. Classicially the leg becomes swollen, reddens, and becomes hot. However not every clot reads the textbook.
Although I wouldn’t expect the pain to resolve once up and moving off the plane. This is more suggestive of arthritis in the knee. Classiclaly arthritis hurts when still, hurts more when you first get moving, then improves with additional movement.
A puzzle for your GP or possibly an ortho.