Soreness in the thigh muscle after a foot fracture is usually caused by long-term braking, excessive functional exercise of the lower limbs, or the combination of lumbar disc herniation and other factors. 1. Prolonged braking: During the conservative treatment of foot fracture, the foot needs to be immobilized by cast or brace, and keeping a posture for a long time may lead to stiffness of local muscles, which will lead to the phenomenon of soreness of thigh tendon. 2. Excessive lower limb exercise: In the late stage of foot fracture, excessive leg activities and exercise may lead to accumulation of lactic acid in the leg muscles, resulting in soreness of the thigh muscles. 3. Combined lumbar disc herniation: usually caused by various factors such as lumbar degeneration. When combined with a herniated lumbar disc, it may compress the nerve root, resulting in thigh pain and numbness. Thigh tendon pain after foot fracture, may also be related to foot fracture combined with thigh muscles, ligaments and other soft tissue injuries, if the rest does not relieve, it is recommended to go to the hospital in time for examination, to clarify the cause of the disease under the guidance of the doctor, to avoid delaying the condition.