Joint Surgeons in Germany

Gelenk Klinik Orthopaedic Clinic

Alte Bundesstrasse 58

D-79194 Gundelfingen


fon: +49-761-79117-228

fax: +49-761-79117-999

Patella (Knee cap)

Patella Disease and Patella Deformity

What is the function of the kneecap?

The kneecap or patella is a bone enveloped by the great extensor tendon of the thigh muscles. Its posterior surface slides up and down within a groove on the end of the thigh bone. Due to its congruent triangular-shape, the kneecap normally fits perfectly into the groove (trochlea). The muscle contraction is transferred directly to the lower leg and extends and straightens the knee.

Patella (Knee Cap) Dislocation Requires Urgent Treatment

Longterm effects of patella dislocation

Each episode of patella dislocation can cause irreparable damage to the cartilage surface of the patella. In many cases the dislocation results in osteochondral shear fractures. Loose bone or cartilage fragments may lock the joint, which may lead to further cartilage damage at other parts of the joint. There is also the risk of tearing the intra-articular ligaments of the articular capsule.

Patella (Knee Cap) Surgery - modern treatment options for stabilizing the Knee Cap

Patella dislocationPatella dislocation with loose articular body (image on left). ©

Surgical treatment of patella dislocation

  • MEdial tightening of the MPFL (Insall surgery)
  • Reconstruction of the medial patellofemoral ligament (MPFL)
  • Medialization of the tibial tuberosity (Blauth surgery)
  • Reshaping of the patella gliding groove (Trochleoplastie)
  • Osteotomy

Lateral Release - no longer an option for the surgical treatment of knee cap dislocation

For many decades Lateral Release was the most popular surgical treatment for chrionic patella instability.

The severing of the outer retaining ligaments of the patella (lateral release or cleavage of the lateral retinaculum) was, for a long time, considered an appropriate solution to instability of the patella. It was believed that by cutting through the outer bands of the ligament, the patella would return to the natural position, thus reducing the tendency to dislocate.

Patella (knee Cap) surgery and treatment after dislocation: What are the long term prospects?

What are the long-term prospects following treatment for knee cap dislocation?

The sooner the treatment is initiated, the better the long term outcome. However, in most cases treatment is started too late. The majority of patients, particularly younger ones, tend to consult their doctor only when the dislocation has become a recurrent problem.

If treated early, success rates for long term stability in the knee joint without any discomfort, would be over 80 percent. When diagnosis and subsequent therapy are delayed, the likelihood of a successful long term outcome as described above, drops to below 20 percent and the development of arthritis in the knee joint (femoropatellar joint) is common. Chondropathies and severe cartilage damage are also often associated with this condition when it is left untreated.

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Orthopaedic Clinic Germany

orthopedic clinic and surgeon in Germany

MVZ Gelenk-Klinik
Orthopaedic Clinic

ISO 9001:2015 certified quality

Alte Bundesstrasse 58

D-79194 Gundelfingen


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Location of Gelenk-Klinik Gundelfingen
View Details of the location
  • Distance to EURO-Airport Basel: 80 km (45 mins)
  • Distance to Zurich: 161 km (1h 40)
  • Distance to Frankfurt: 259 km (2h 20)

Centre for Arthroplasty

Center of Excellence in Arthroplasty

Certified Centre for Arthroplasty (Centre for Endoprosthesis)