Rotating Hinge Revision Total Knee Arthroplasty for Severe Arthrofibrosis

Area of Science:

• Orthopedic Surgery
• Arthroplasty
• Biomedical Engineering

Background:

• Stiffness after total knee arthroplasty (TKA) is a common complication, occurring in 1-13% of patients.
• Causes include mechanical issues (malposition, overstuffing) and idiopathic arthrofibrosis, which is harder to treat.
• Nonoperative treatments like physical therapy and manipulation under anesthesia are often insufficient for severe cases.

Purpose of the Study:

• To evaluate the efficacy of rotating hinge revision total knee arthroplasty (TKA) for treating severe arthrofibrosis.
• To demonstrate the benefits of a rotating hinge implant in restoring knee range of motion after failed conservative treatments.
• To provide a surgical solution for refractory stiffness following TKA.

Main Methods:

• Surgical revision involving removal of previous components and addressing all sources of stiffness.
• Creation of a balanced extension gap and a deliberately loose flexion gap to maximize motion.
• Utilization of a rotating hinge prosthesis to ensure stability despite potential gap imbalance.
• Additional procedures may include distal femoral condylectomies and patellar component revision.

Main Results:

• Studies show significant improvements in knee range of motion following rotating hinge revision TKA.
• Reported improvements range from 20° to a median of 45° in flexion.
• This approach offers greater motion gains compared to other revision options like varus-valgus constrained implants.

Conclusions:

• Rotating hinge revision TKA is an effective treatment for severe arthrofibrosis, providing substantial gains in knee range of motion.
• This technique allows for a more aggressive approach to regaining motion when faced with refractory stiffness.
• Patients should be aware of potential risks, including recurrent arthrofibrosis and mechanical complications, similar to other revision TKA procedures.