Saphenous nerve entrapment or impingement is really quite unfortunately common, especially among older people.
That's why it's so important to know the saphenous nerve damage symptoms: tenderness in the leg, knee pain that mimics an orthopedic disorder, tenderness, etc.
Luckily, there are a lot of treatment options available for dealing with the pain; everything from OTC medications to an ultrasound-guided saphenous nerve block.
As far as I'm concerned, when it comes to saphenous nerve blocks, ultrasound is the way to go -- you get much more accuracy than you did with the other, older type of nerve blocks.
Oh, and one thing to mention to your doctor if you are experiencing symptoms like this -- tell him to double check that it's not your lateral femoral cutaneous nerve. That one can cause a lot pain too, but requires different treatment.
Good health, all.