[Mid-term effectiveness of rotating hinge knee prosthesis for severe knee deformity]

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering

Background:

• Severe knee deformities pose significant challenges in total knee arthroplasty (TKA).
• Rotating hinge knee (RHK) prostheses are designed to address complex knee instability and deformity.

Purpose of the Study:

• To evaluate the mid-term clinical effectiveness and safety of RHK prosthesis in patients with severe knee deformities.
• To assess functional outcomes, pain levels, and quality of life following RHK implantation.

Main Methods:

• Retrospective analysis of 24 patients (mean age 70 years) who underwent TKA with RHK prosthesis.
• Data collected included operative details, complications, Knee Society Score (KSS), Visual Analogue Scale (VAS), Range of Motion (ROM), and SF-36 scores.
• Radiographic assessment evaluated prosthesis position and alignment.

Main Results:

• Significant improvements in KSS, VAS, and ROM were observed postoperatively and maintained at mid-term follow-up (mean 5.5 years).
• Radiographs showed no signs of radiolucent lines, osteolysis, or subsidence.
• Complications included patellar fracture (4.17%), incision issues (4.17%), and periprosthetic infections (8.33%).

Conclusions:

• RHK prosthesis demonstrates satisfactory mid-term effectiveness for severe knee deformities, leading to functional improvement.
• Postoperative infection remains a significant complication requiring careful management and emphasis.
• The RHK prosthesis provides a viable option for complex knee reconstructions, balancing functional gains with potential risks.