Related Experiment Video
Updated: Feb 14, 2026

Author Spotlight: Investigating the Mechanism of Action of Acupotomy in Treating Knee Osteoarthritis
Published on: October 20, 2023
Return of Quadriceps Strength After Primary Total Knee Arthroplasty With Single-Radius Knee System: Five-Year
Alexander Fokin1, David Heekin2
1Institute for Orthopedic Research, St. Vincent's Medical Center, Jacksonville, Florida. Address correspondence to: Alexander Fokin, MD, PhD, Institute for Orthopedic Research, St. Vincent's Medical Center, 2 Shircliff Way, Jacksonville, FL 32204;
Abstract:
Preoperative quadriceps muscle strength (isometric peak torque) was expectedly lower on the total knee arthroplasty side in comparison with the unaffected contralateral side and it was further reduced after surgery. This reduction continued for up to 6 months postoperatively. After 6 months, muscle strengths exceeded preoperative values and continued to increase for the following 2 years. From 2 to 5 years postoperatively, there was a tendency for decline; however, the quadriceps muscle strength still exceeded preoperative values. On the nonoperative side, the increase in muscle strength was detected 1 year after surgery and it was still noticeable at 5 years. Contralateral side improvement can be explained by the increased mobility of the patients. Knee Society Scores and function scores were significantly increased at 3 months after surgery and were significantly greater than preoperative values 5 years after surgery. SF-12 (physical score) exceeded preoperative values at 3 months and this increase was observed continuously over the 5-year follow-up. (Journal of Surgical Orthopaedic Advances 26(4):211-215, 2017).
Related Concept Videos
Knee Joint
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
Radius of Gyration of an Area
Venous Return
What is Venous Return?
Venous return refers to the rate at which blood flows back to the heart from the body's peripheral veins. It's an integral part of the circulatory system...
Bones of the Upper Limb: Radius
The radius has a nail-shaped head, and a...
Schwarzschild Radius and Event Horizon
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
Degree of Curvature and Radius of Curvature

