Hello danguy,
While not exactly the same problem, I had something similar. I had bacterial endocarditis that attacked my heart valve and required emergency surgery. I was kept alive with an arterial pump for several days until they could perform the valve replacement OHS. After the surgery, my right foot was in substantial pain. I had no significant pain from the heart surgery, but my foot was never right. While in the hospital recovering from the OHS, because I complained about the foot pain, they did an ultrasound and an X-ray of my leg/foot, but did not find anything, and dismissed it as some sort of sprained foot.
Even after months of recovery from the OHS, I could not walk more than a block without the pain in my foot and calf in my right leg becoming excruciating. I raised this issue with my cardiologist at my 3 month post-surgery checkup, and he scheduled me to see a vein specialist. The vein specialist did a test called an Ankle Brachial Pressure Index (ABI) where the blood pressure is measured at various points in both arms and legs. This test clearly showed a blockage in my right leg just below the knee. It turns out, there was a a blockage in the artery of my right leg with a mycotic aneurysm caused by the bacterial vegetation from the endocarditis breaking off and traveling to the artery in my leg, blocking blood flow to my lower right leg and foot.
I eventually had to have a second surgery on my right leg to take part of the saphenous vein from my right thigh and bypass the blocked artery in my lower leg to get proper blood flow restored.
Since you indicate you have not yet had the heart surgery, only a coronary angiography, it is possible that you have either slight damage to the artery from the catheter insertion, or possibly some plaque was dislodged and has caused blockage in your leg.
I would ask to see a vein specialist and have the ABI test performed to see if there is indeed any indication of any arterial blockage. If so, they can locate the trouble spot and take whatever action would be required.
Good luck.