A 68 year old man complained of aching pain around his left hip and right knee; it is worse after exeion and is relieved with rest. Both joints are tender and swollen, with pain and crepitus on passive motion. Tests for rheumatoid factor and antinuclear antibodies are negative, and ESR is normal. X-rays are likely to reveal all of the following, EXCEPT:
Joint space narrowing Osteoahritis Subchondral Bone Sclerosis Osteophytes