They certainly could be representative of a worsening myelopathy. If everything came on suddenly then you definitely should seek medical attention on a semi-urgent basis. But if it's been slowly progressing, it could just be due to arthritic or degenerative changes with time/age. Either way, with these new symptoms you should be examined by the surgeon and possibly reimaged with MRI to make sure everything that was done prior is ok and that nothing new has happened. Good luck.