Comparative Functional and Isokinetic Analysis between Implants with Posterior Stabilization and Rotating Hinge Total...

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Rehabilitation Medicine

Background:

• Knee arthroplasty aims to restore function and strength.
• Posterior-stabilized and rotating hinge implants are used for different indications.
• Comparing their outcomes is crucial for surgical decision-making.

Purpose of the Study:

• To compare functional outcomes and muscle strength between posterior-stabilized and rotating hinge knee implants.
• To evaluate the impact of implant type on patient recovery and performance.

Main Methods:

• A comparative study involving 43 patients (51 surgeries).
• Function assessed using the Knee Society Score (KSS).
• Muscle strength measured via isokinetic dynamometry at 60°/s.

Main Results:

• No significant differences in KSS or peak torque between implant groups in primary arthroplasty.
• Primary arthroplasty with hinge implants showed higher peak flexor torque than revision cases.
• Constrained implants are indicated for severe instability, bone destruction, or deformity.

Conclusions:

• Constrained implants provide functional and strength outcomes similar to posterior-stabilized implants in primary knee arthroplasty.
• Septic revision with rotating hinge prostheses is associated with lower flexor muscle strength compared to primary constrained implant arthroplasty.