Development of a new Knee Society scoring system

Area of Science:

• Orthopedics
• Biomedical Engineering
• Patient-Reported Outcomes

Background:

• The original Knee Society Clinical Rating System (1989) requires updates.
• Increasing demand for total knee arthroplasty (TKA) necessitates a new scoring system.
• Contemporary TKA patients are younger and more diverse, with varied expectations and activity levels.

Purpose of the Study:

• To develop and validate a new Knee Society Scoring System.
• To better characterize TKA patient expectations, satisfaction, and physical activities.
• To create a tool for assessing diverse patient populations undergoing TKA.

Main Methods:

• Developed a new scoring system in two stages.
• Administered a comprehensive activity survey to 101 TKA patients.
• Validated a prototype instrument with 497 TKA patients across 15 institutions using statistical and psychometric analyses.

Main Results:

• The new Knee Society Scoring System is broadly applicable and accurately characterizes TKA patient outcomes.
• Statistical analysis confirmed the internal consistency, construct validity, convergent validity, and reliability of the subscales.
• The system effectively measures patient-reported outcomes after TKA.

Conclusions:

• The new Knee Society Scoring System is a validated instrument using surgeon and patient data.
• It is adapted to the diverse lifestyles and activities of modern TKA patients.
• This tool aids surgeons in understanding individual patient priorities and the factors influencing TKA outcomes.