The human knee joint has a medial meniscus and a lateral meniscus. Each meniscus is made up of an elastic collagen fiber tissue. The menisci are present between the sliding surfaces of the upper tibia and lower femur. They move within the joint during knee flexion and knee extension, as well as in external or internal rotation movements in the same direction. The lateral meniscus is smaller than the medial meniscus and also more flexible. The menisci serve to offset the mismatch between the upper tibia and lower femur, to increase the contact surface and for power transmission. During the transfer of power, the menisci lead to a stress distribution of 30-70% of the total load (after a total meniscectomy increases the load on the cartilage). The meniscus is also responsible for shock absorption, joint lubrication, and also contributes to the stability of the entire knee joint with. Meniscal tears can be traumatic or degenerative reasons. They are on the inside 3x frequently than on the outer side of the knee joint.

Therapy patellar dislocation

The most common symptoms of a meniscal tear are pain on the outside or inside of the knee joint, especially under loads and rotational movements, the “blocking / catching” of the joint, i.e. the temporary inability to bend the knee or stretch out completely. It is a specific reference to an impacted bucket handle or flap tear of the meniscus. It can sometimes also lead to swelling and warmth of the knee joint due to the acute stimulus condition of the knee affected.

Symptoms

The patient with a patellar dislocation usually an anterior knee pain at. One of the most common diseases include Plicaschmerzen, habitual or traumatic patellar dislocation, cartilage and bone damage to the patella and its plain bearings.

Structure and function of the knee cap (patella)

The kneecap (patella) is a free running “Abstützknochen” for the extensor tendon of the thigh. It has no fixed bony joint guidance, but is suspended only to tendons, muscles and ligaments. To slide in a V-shaped groove of the femur (plain bearings, trochlea). In Congenital deformity or change in the muscle balance (eg after surgery) it is susceptible to ailments and injuries.

Causes

  1. Habitual dislocation of the patella

    When habitual patellar (sub) luxation of the patella instability occurs due to the plant on is too flat or weak form of the sliding bearing retaining ligaments and muscles of the patella and knee joint capsule.

  2. Traumatic patellar dislocation

    Traumatic dislocation of the patella occurs as a consequence of an accident after luxation (dislocation to the outside) the instability.

  3. Cartilage-bone damage

    At the kneecap and in their plain bearings can cause hypoperfusion and death of bone areas. The overlying cartilage is destroyed in advanced stage.

Therapies

  1. habitual dislocation of the patella

    Conservative therapy

    Depending on the extent of existing Formanweichungen of the knee joint can be performed initially a conservative treatment trial. The exercises are designed to serve principally to strengthen the vastus medialis muscle in leg extension. Important in any case, the cooperation of the patient. The treatment can only be successful if over an extended period of at least 3-6 months, the exercise programs are carried out consistently. A longer-term immobilization or discharge should be avoided in any case.

    Surgical treatment

    If unsuccessful, the sole conservative treatment, operative measures are to reconsider. Depending on the cause and the damage observed correction surgery is necessary. One capsule splitting and / or media gathering of the knee joint capsule are options. The displacement of a piece of bone in the lower leg inward provides for cartilage damage to the knee cap or bony Seitversatz the kneecap further surgery form dar. It Here, the approach of the patellar ligament (patellar tendon) is replaced by bone in the lower leg and about 1-2 cm further screwed back towards the inside . If the cause of the thigh may be necessary to correct the hip joint surgery. Complementary therapies cartilage and / or the combination of the methods described are depending on the cause often useful.

  2. Traumatic patellar dislocation

    Conservative therapy

    Depending on the extent of existing Formanweichungen of the knee joint can be performed initially a conservative treatment trial. The exercises are designed to serve principally to strengthen the vastus medialis muscle in leg extension. Important in any case, the cooperation of the patient. The treatment can only be successful if over an extended period of at least 3-6 months, the exercise programs are carried out consistently. A longer-term immobilization or discharge should be avoided in any case. Surgical treatment

    If in traumatic dislocation of the patella only the joint capsule is torn and bleeding have occurred, then an arthroscopic lavage often be sufficient and subsequently conservative therapy. Surgical procedures are necessary for cartilage Absprengungen and extensive rupture of a retaining band of the kneecap (patello-femoral MPFL = medial ligament). A Pin a blew out osteochondral fragment is usually achieved via a small skin incision with bioabsorbable anchors. A seam of the capsule may be supplied in the same way arthroscopically. The replacement of the torn MPFL is biomechanically necessary to restore the Patellafunktion and is performed similarly to the cruciate ligament replacement through a minimally invasive procedure with autologous tendon material from the inner thigh.

  3. Cartilage-bone damage

    Treatment is usually conservative first stage dependent. Conservation, sports ban and possibly anti-inflammatory medication may be necessary for pain relief. , if the process X-ray or magnetic resonance imaging progresses, the stove should be surgically drilled to stimulate a vascularization and healing. This is called an ante or retrograde drilling. Sometimes the dead tissue needs to be removed before it detaches and becomes a free “joint mouse”. This can cause further cartilage destruction on yet healthy joint interests. Subsequently, a drilling of the underlying bone is performed to stimulate vascularization and regeneration of cartilage repair tissue also. In recent years, we are increasingly able to make the cartilage-bone transplantation (mosaicplasty) routinely with great success even with such diseases.