The effects of simulated knee arthrodesis on gait kinematics and kinetics.

Knee arthrodesis is commonly performed to treat joint pain and instability in cases of multiple failed knee replacement surgeries, bone loss, traumatic injury, infection, or loss of the quadriceps extensor mechanism, but its mechanics are poorly understood. This study quantified the changes in gait kinematics and kinetics induced by simulating knee arthrodesis. A total of 10 healthy subjects (M/F, n = 5/5; aged 18-23) with no history of gait abnormalities were recruited for this study, and knee arthrodesis was simulated for 0 through 24 h using an immobilizing knee brace.

Knee arthrodesis: procedures and perspectives in the US from 1993 to 2011.

Background: The incidence and prevalence of knee arthrodesis (fusion) in the United States is largely unknown, in spite of numerous case reports and review articles that have called attention to this life altering procedure.

Purpose: This study was conducted to determine long-term knee arthrodesis incidence and patient populations, and to characterize the associated healthcare burden.

Methods: The Nationwide Inpatient Sample was used to evaluate knee arthrodesis procedures performed in the United States between 1993 and 2011.