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The knee joint is, if not the most important, one of the most important joints of the human body. The knee is the linchpin between the pelvis and the lower limbs as it transmits all the forces that occur on the body, towards the lower limbs and especially towards the ankles. It consists of two smaller joints, the stifle joint and the patellofemoral joint. The need for stability and movement of the knee is being answered by the close-by muscle and commissural elements of the area. Indeed, a lot of muscles act upon the knee or contribute through their action on its stability. Some of them are, the quadriceps (consisting of four smaller muscles), the tensor of fascial lata, the posterior muscles of the femur, the gastrocnemius, the soleus and the popliteal. As far as the ligaments and the articular capsule are concerned, it consists mostly of the two cruciate ligaments – anterior and posterior -, the two side ligaments – outer and inner -, the articular link, the two meniscus – inner and outer – and other ligaments such as the patellar, the ligaments of the kneecap and other. The perfusion of the knee mostly occurs through the popliteal artery, whereas the fibers that innervate it are, the femoral, the thyroid, the upper glutaeus, the sciatic, the tibialis and the peroneus. In order to understand the biomechanics of the knee, it is imperative to be familiar with the terms of kinetics and kinematics. The first one deals with forces which are pulled on the joint and the second one deals with the movements that occur on the joint during all three stages of movement. The knee moves on all three stages of movement: on the frontal, the sagittal and the transverse. The kneecap has an important role for the knee as it augments the force or the aptitude of the quadriceps, it protects the articular surfaces of the femoral knuckle when the knee flexes, it reduces the pressure and distributes the forces on the femoral and it protects the quadriceps hamstring from catastrophic compressive forces when the knee flexes with resistance. When it comes to knee injuries, fracture of the anterior knee ligament is the most common with a 40-50% of frequency. Factors which might cause fracture of the ACL are environmental, anatomical, hormonal as well as neuromuscular causes. The ligament can be injured through contact e.g. clash with the opponent (in contests) or without contact, e.g. after falling. Sports which show the highest frequency rates of fracture of the ACL are football (54,4%), handball (47%) and basketball (36%). Diagnosis is based on clinical exams and imaging exams (MRI, radiography). Symptoms appear from the first minute of the injury and are mostly, the edema and the feeling the injured person has that their knee is not stable. Treatment of the fracture can be either with or without surgery, which depends on each patient’s needs. Whichever the treatment chosen, physiotherapy is an integral part of the whole process of dealing with the fracture of the ACL. Physiotherapy can be divided in two categories, the preoperative and postoperative. Accessing the patient is a very important part of physiotherapy as it can provide with an exact idea of the extent of the injury, as well as the disadvantages shown by the patient (e.g. movement or strength). Preoperative physiotherapy helps to keep the patient in a good physical condition after the surgery as it seeks to prepare them physically and psychologically for the operation. After the operation physiotherapy may lead the patient towards full rehabilitation, in the case of the patient being an athlete the goal of the physiotherapies is to return him as soon as possible to his sporting activities. The means used for physiotherapy are: electrotherapy, cryotherapy, kinesiotherapy, taping and other physiotherapeutic techniques (e.g. manual therapy). Summarizing, physiotherapy is very important after rapture of the ACL as through its means and techniques it can contribute towards the patient’s rehabilitation as well as his return to everyday activities.