One issue I have had six weeks since hip surgery is a sudden episode of knee and shin pain on the right hip side that was replaced.. Have arthritics in both knees but haven't had this pain before. Waiting or a Dr visit to determine what is going on. Some comments indicate that if your leg had been shorter due to hip issues that getting the right length back and learning the proper walking gait again may create some temporary knee issues that seem related to the knee patella.