No offense to GP's but just cause he/she says it is not significant on the test does not mean it is not a significant problem functionally. Do your own tests. Check ankle/brachial index, rubor of dependency etc. What does his left lower leg look like? Any differences vs right ie Atrophy, dermalogical changes (edema, Hemosiderin staining, hairloss). As stated earlier if the pt rest and it gets better that would be a big telltale. Good luck