Retropatellar arthritis, also known as patellofemoral arthritis or kneecap arthritis, is a degenerative joint disease that affects the cartilage behind the kneecap. This condition can lead to significant pain and limited mobility. When conservative treatments are no longer sufficient, endoprosthetic care provides an effective solution for restoring joint function and improving quality of life. This article highlights the various aspects of endoprosthetic care for retropatellar arthritis, including indications, procedures, benefits, and aftercare.

Basics of retropatellar osteoarthritis

Causes and symptoms

Retropatellar arthritis is caused by a combination of factors such as mechanical overload, injuries, and degenerative processes. Overweight and sports activities that heavily stress the knee can accelerate cartilage degradation. Injuries such as patellar dislocations and malalignments like knock knees or bowlegs also contribute to the condition.

Typical symptoms are:

• Pain behind the kneecap, especially when climbing stairs or sitting for extended periods.
• Stiffness and swelling in the knee.
• Grinding noises during movement.

Diagnosis of retropatellar arthritis

The diagnosis of retropatellar arthritis begins with a thorough medical history and physical examination. Imaging techniques such as X-ray, MRI, and CT are crucial for accurately assessing the cartilage damage and planning the endoprosthetic care.

Conservative treatment options

Before an endoprosthetic care is considered, conservative treatment approaches are often tried:

• Physiotherapy: Strengthening the muscles around the knee, improving mobility, and reducing the load on the kneecap.
• Medicinal therapy: Use of painkillers and anti-inflammatory medications.
• Orthopedic aids: Use of knee orthoses and custom-made shoe insoles.

Indications for Endoprosthetics

An endoprosthetic care is considered when:

• Conservative treatments do not provide adequate pain relief.
• Quality of life is significantly impaired.
• There is progressive joint damage.

The decision also depends on individual factors such as age, activity level, and overall health.

Endoprosthetic options for retropatellar arthrosis (mini-implants)

Patellofemoral partial prosthesis (Wave / PFJ)

In cases of arthritis limited to the patellofemoral region, a patellofemoral partial prosthesis can be used. This prosthesis replaces only the damaged area behind the kneecap and preserves the remaining joint structures.

The patellofemoral partial prosthesis is a specialized form of knee prosthesis, specifically designed to address damage to the patellofemoral joint, the area behind the kneecap (patella) and the front part of the thigh bone (femur). This prosthesis is a less invasive alternative to total knee replacement and is used in cases where the arthritis or cartilage damage is limited to the patellofemoral joint.

Indications for patellofemoral partial prosthesis

The patellofemoral partial prosthesis is considered in the following cases:

• Localized arthritis: Patients with isolated arthritis of the patellofemoral joint.
• Patellar malalignment: Patients with patellar dislocations or instabilities that lead to chronic pain and functional limitations.
• Failure of conservative therapies: When physical therapy, medication, and other conservative measures do not provide adequate relief.
• Younger patients: Patients who, due to their age and activity level, do not need or want a total prosthesis.

Benefits of patellofemoral partial prosthesis

The patellofemoral partial prosthesis offers several advantages over the total knee prosthesis:

• Less invasive surgery: Since only a part of the knee is replaced, the procedure is less invasive.
• Preservation of the natural knee anatomy: Only the damaged area is replaced, preserving the majority of the natural knee joint.
• Faster recovery: Patients typically recover faster and can return to their normal activities more quickly.
• Less postoperative pain: Due to the smaller surgical trauma, patients often experience less postoperative pain.

Total prosthesis (knee TEP)

A total prosthesis is used in advanced osteoarthritis with involvement of several joint sections. This comprehensive solution replaces the entire knee joint and provides long-term pain relief and functional improvement. Modern materials and techniques ensure high durability and better quality of life.

Surgical procedure

The surgical procedure involves several steps:

• Preparation: Comprehensive preoperative planning, including imaging and physical examination.
• Surgery: Removal of damaged cartilage and insertion of the prosthesis. The procedure is usually performed under general anesthesia.
• Aftercare: Intensive physiotherapeutic care to promote healing and restore joint function.

Postoperative Rehabilitation

Postoperative rehabilitation is crucial for the success of endoprosthetic care:

• Early mobilization: Movement therapies to prevent joint stiffness and promote healing.
• Physiotherapy: Individualized training plans to strengthen muscles and improve mobility.
• Pain management: Use of medications and alternative methods such as acupuncture and TENS for pain relief.

Long-term results and prognosis

Endoprosthetic care for retropatellar arthritis can lead to a significant improvement in quality of life. Successful surgeries offer long-term pain relief and enable a return to an active lifestyle. Correct indication and regular follow-up care and physiotherapeutic measures are crucial to maintaining the function of the prosthesis and avoiding complications.

Conclusion

Endoprosthetic care offers an effective solution for patients with retropatellar arthritis who do not respond to conservative treatments. By using modern techniques and materials, pain can be alleviated and joint function sustainably improved. Careful preoperative planning, a well-performed surgical intervention, and comprehensive postoperative rehabilitation are crucial for the success of the treatment.