When the muscles in the legs atrophy after lumbar fusion surgery there are usually no obvious symptoms in the early stages, and sometimes they may be accompanied by varying degrees of muscle weakness. However, when the muscles in the legs atrophy for a period of time without treatment, there are usually symptoms of smaller muscle size, decreased muscle strength, and weight loss. When the size of the muscles becomes small, it is accompanied by thinning of the limbs, obvious atrophy of the leg muscles, and a prominent bone pattern. Decreased muscle strength is mainly characterized by difficulty in squatting and standing. The weight loss is due to a more pronounced weight loss caused by a significant decrease in muscle volume. When the above symptoms appear in the leg muscles after lumbar spine fusion surgery, you should go to the hospital in time and carry out planned training under the guidance of the doctor and therapist in order to restore muscle strength and muscle shape as soon as possible.