This is usually a false sensation and goes away after a month or two. A great deal of effort is put into trying to get the leg lengths correct. But accurate measurement is very difficult during surgery. It is common to be off by a quarter of an inch or so. Most people easily adjust to a difference of a quarter inch, and are hardly aware of it.
Many normal people have up to a quarter inch in difference.
Sometimes, however, the patient may feel that the leg is an inch or more too long when, in fact, the leg lengths are absolutely equal. This brings us to the difficult concept of true and apparent leg length differences. True leg lengths are measured from the pelvis to the ankle. Apparent leg lengths are measured from the navel to the ankle. In a normal person the true and apparent leg lengths are equal.