Since pain is caused by different injuries, pain has its own characteristics and patterns. Through the analysis of characteristics and patterns, the cause of the disease is found smoothly without detours. When the cases of sciatica were reviewed, analyzed and treated, it was found that the misdiagnosis rate was as high as 54.1%, and 93.9% of the misdiagnosed cases were related to the iliotibial bundle. The location of the source of the disease, the symptoms, the location and scope of the pain are significantly different, because the lateral aspect of the lower limb should include the lateral aspect of the large and small legs, while the sciatic nerve reaches the calf and innervates the calf through the posterior mid-thigh, but not through the lateral aspect of the thigh, how can the pain of the lateral aspect of the thigh be counted to the sciatic nerve? The pain in the lateral thigh is usually caused by an injury to the iliotibial bundle. Therefore, anatomical relationships should be noted in the diagnosis. A. Posterior thigh pain: The muscles of the posterior thigh include the biceps femoris muscle on the lateral side and the semitendinosus muscle on the medial side, which are innervated by the sciatic nerve. Therefore, when the posterior thigh pain, the first thing to check whether the femoral flexor muscle group is normal? Is there a history of strain or other injury to the flexor muscle groups. The location of injury to the femoral muscle group is mostly at the junction of the muscle and the muscle belly, the bifurcation of the femoral flexors on the inner and outer sides and the attachment area, etc.; strains of the muscle belly occur from time to time, and their painful points are mostly in the middle section, and there is often significant swelling or hematoma, hard lumps and pressure pain on palpation, etc. The pain increases with active and passive muscle contraction or resistance to contraction. Neuralgia is first considered as an injury to the sciatic nerve or the superior gluteal cutaneous nerve. Both injuries can show pain in the lumbar, hip, and posterior thigh, and leg lifting can be limited to varying degrees, but pain from injury to the superior gluteal nerve is more diffuse, and the location is often plausible and vague, only to the posterior thigh less than the calf. Sciatic nerve injury is along the sciatic god, and its pain is not only in the waist, buttocks, posterior thigh, and the whole calf, especially the lateral calf numbness and pain, leg lifting and lumbar extension is limited, there is pulling pain, tendon reflex is weakened or disappeared, and muscle atrophy is seen in severe cases. The root cause of sciatica is mainly in the lower lumbar segment and the pear-shaped muscle, and the superior gluteal nerve should be dug in the upper lumbar segment. Second, the front side of the thigh pain: when the front of the thigh pain in the lower and middle section, attention should be paid to the quadriceps injury, in the middle section is mostly muscle belly strain, often palpable hard mass, this is muscle spasm, hematoma mass, etc. after muscle strain, with pressure pain: if the pressure pain is in the lower section, above the patella, attention should be paid to the quadriceps muscle belly and tendon intersection strain, or even rupture injury. Thus, the pain increases when the quadriceps muscle contracts or resists knee extension, and if there is a rupture, a hollow transverse groove can appear above the knee, and the quadriceps muscle is clearly upwardly contracted into a mass. If the painful point appears at the root of the leg, such as when touched below the midpoint of the inguinal ligament, it is necessary to consider the injury of the iliopsoas muscle because it is attached to the femoral tuberosity, so the pressure point can be felt here, and the pain at this point increases when the leg is lifted with resistance; when the pressure point is at the anterior superior iliac spine, in addition to considering the injury of the attachment point of the broad fascia tensor muscle, it should be noted that this is also the attachment point of the suture muscle, which runs from the anterior superior iliac spine through the front of the femur, sloping downward and ending at the tibial medial tibial condyle. Therefore, it is important to check the attachment points of this muscle and the muscle line for pressure pain, flexion of the knee and external rotation of the thigh, or resistance to complete this movement for pressure pain. If there is a positive reaction, injury to the suture muscle should be considered, and if there is pressure pain in the anterior inferior iliac spine, injury to the head attachment area of the rectus femoris should be considered. Both of these muscles are innervated by the femoral nerve. If the muscle itself has been ruled out, the upper lumbar segment (L2-4) should be examined to rule out lumbar pathology if the bone nerve is considered to be the cause. Third, the medial thigh pain: the medial thigh muscle group called the adductor muscle, so that the thigh inward, so if the legs for a long time to stand forked strong pulling the adductor muscle, can cause pain in the inner thigh, resistance inward thigh pain, for the adductor muscle over fatigue or injury caused by pain; for resistance inward examination, such as the location of pain in the pubic bone, the pubic bone branch has pressure pain or even its surface has rough unevenness, should pay attention to may be Osteitis of the pubic bone caused by chronic injury to the adductor muscle. Because the pubic muscle is doubly innervated by the femoral nerve and the greater adductor muscle by the sciatic nerve, so when the two muscles have pain, it is necessary to pay attention to the femoral nerve and the sciatic nerve, in addition to all the internal adductor muscle is innervated by the foraminal nerve, attention should be paid to check the middle section of the lumbar spine (L3-4) to exclude lumbar lesions. Four, lateral thigh pain: no specific muscle group in the lateral thigh, mainly the iliotibial bundle in this, to support the lower limb upright function. If the iliotibial bundle injury, the pain is mainly in the buttocks, but can be affected along the lateral thigh to the lateral calf, and the lower and middle 1/3 junction of the lateral thigh is a sensitive point of pressure pain, so the pain of the lateral thigh is basically due to iliotibial bundle injury. Although the pressure pain at the junction of the lower and middle 1/3 may sometimes be caused by injury to the lateral head of the quadriceps muscle, it is not difficult to distinguish between the two in terms of the direction, extent, and function they affect. In lateral femoral dermatomal neuritis, although there can also be pain in the lateral thigh, there is more predominantly abnormal sensation, numbness, and decreased dermatomal sensation in the upper and middle lateral thigh. It is important to draw attention to the fact that the lateral thigh is not innervated by motor nerves, and the sciatic nerve only runs down the back side of the thigh and does not pass through the lateral thigh, so when there is pain in the lateral thigh, it should not be thoughtlessly identified as sciatica. Fifth, the posterior lateral thigh pain: the posterior lateral side for the biceps femoris swelling and pressure pain, half tendon and half membrane muscle is not affected, which can not be explained by the sciatic nerve or with iliotibial bundle injury. This phenomenon is mostly caused by injury to the femoral square muscle, the general examination position is difficult to find the pain point, should be in the healthy side lying, the healthy limb in the lower straight, the affected limb flexed hip and knee, leg inward, knee against the bed, so that the hip greater trochanter and sciatic tuberosity as far as possible, between the sciatic tuberosity and greater trochanter and slightly above, is the location of the femoral square muscle, can be found obvious pressure pain. In this position, manipulation of the femoral square muscle and the biceps femoris can have an immediate effect. In this patient, the fifth lumbar vertebra is often found to be diseased or the sacrospinal muscle on that side is damaged and spastic, and if this is treated at the same time, the effect will be faster and more obvious. It may be that the femoral square muscle is innervated by the sacral plexus branch and the biceps femoris is innervated by the sciatic nerve. Injury to the sacral area may affect the stimulation of these nerves and affect the symptoms of these two muscles through these nerves.