Arthrofibrosis: What Causes Arthrofibrosis, and What Are the Diagnostic and Treatment Options?

Arthrofibrosis is pathological scar tissue formation in a joint that typically occurs following surgical procedures such as total knee replacement (TKR) or arthroscopy. The excessive formation of scar tissue causes the joint to stiffen and lose its normal function. For those affected, this often results in a significant reduction in quality of life, as even everyday movements, such as walking or climbing stairs, can become a challenge.

Arthrofibrosis of the knee: Excessive scar tissue leads to stiffness and limited mobility.

The symptoms of arthrofibrosis are often gradual and usually begin with a feeling of stiffness in the affected joint. Over time, the symptoms worsen, leading to the following complaints:

• Pain: Especially during movement, but also at rest.
• Limited range of motion: The joint can no longer be fully extended or flexed.
• Swelling: The affected joint may swell and feel warm to the touch.
• Muscle weakness: The limited range of motion can lead to weakening of the surrounding muscles.

The exact causes of arthrofibrosis are not yet fully understood, but there are several risk factors that may contribute to the development of this condition:

• Surgical procedures: The risk is particularly elevated following knee surgeries, such as total knee replacement (TKR) or arthroscopy.
• Infections: Postoperative infections can promote scar tissue formation.
• Injuries: Severe injuries to the knee joint can also lead to arthrofibrosis.
• Genetic predisposition: Some people are more prone to excessive scarring due to their genetic makeup.
• Excessive immobilization: Prolonged immobilization of the joint after surgery can contribute to the development of arthrofibrosis.

Arthrofibrosis is diagnosed through a thorough clinical examination, during which the doctor assesses the range of motion of the affected joint. In addition, imaging techniques such as magnetic resonance imaging (MRI) can be used to assess the extent of scarring and joint stiffness. Arthroscopy can also aid in diagnosis and simultaneously offers the possibility of minimally invasive treatment.

When distinguishing between primary arthrofibrosis and the secondary form, specialists pay particular attention to the timeline of onset and the triggering factors. Primary arthrofibrosis occurs just a few days after surgery and usually progresses independently of any clear mechanical cause—the function of the affected joint deteriorates rapidly, often despite correct implant placement.

Secondary arthrofibrosis, on the other hand, typically results from mechanical problems such as irritation, malalignment, or insufficient stability. While consistent conservative treatment is the initial focus for the primary form, treatment for both primary and secondary arthrofibrosis is always tailored to the specific underlying cause and adapted on a case-by-case basis.

The treatment of arthrofibrosis is often complex and requires close collaboration between orthopedic surgeons, trauma surgeons, and physical therapists. The goal of therapy is to restore joint mobility and relieve pain. The following treatment options are available:

• Physical therapy: Regular, targeted exercise can help reduce joint stiffness.
• Medication: Anti-inflammatory drugs and pain relievers can alleviate symptoms.
• Arthrolysis: A surgical procedure in which excess scar tissue is removed.
• Manipulation under anesthesia: The joint is forcibly moved under anesthesia to relieve stiffness.
• Arthroscopic scar removal: A minimally invasive method for removing scar tissue.

The course of arthrofibrosis depends on various factors, including the extent of scarring and the chosen treatment strategy. In many cases, the condition is chronic and requires intensive therapy. The success of treatment often depends on how early arthrofibrosis is detected and treated. With timely intervention, most patients can achieve a significant improvement in symptoms. In some cases, however, a complete restoration of joint function may no longer be possible.

Arthrofibrosis is a serious complication that can occur after joint surgery and significantly impairs the quality of life of those affected. Early diagnosis and consistent treatment are crucial for restoring joint mobility and alleviating pain. If you notice symptoms such as joint stiffness, pain, or swelling after knee surgery, you should definitely consult a specialized orthopedic surgeon. They can take the necessary steps to prevent the condition from worsening and improve your quality of life.