The main symptom of an osteoid osteoma is achy, dull pain. This pain often gets worse at night. Activity has no effect on the pain. Other symptoms may include: Bone deformity. Gait disorders. Joint pain and stiffness. Decrease in muscle size (atrophy). One leg being longer than the other (with a thigh or shin tumor). Sciatica and scoliosis (with a spine tumor). Swelling. Symptoms of a tumor near your joint may include: Joint effusion (swollen joint). Osteoarthritis. Stiffening and tightening (joint contractures)