Wear Testing of Moderate Activities of Daily Living Using In Vivo Measured Knee Joint Loading

This study analyzes the wear performance of total knee replacements (TKR) under different daily activities using in vivo load data. It compares wear rates for activities like walking, stair climbing, sitting, standing, and cycling, using a knee wear simulator. The research standardizes in vivo load data for walking, stair climbing, sitting/standing, and cycling to simulate these activities on a knee wear simulator. Wear is then assessed gravimetrically, and wear particles are analyzed. The findings suggest that walking produces the highest wear rates, significantly more than ISO walking. Cycling, despite being a low-impact activity, may contribute more to articular wear than stair climbing due to the frequency and duration of the activity.

• 1
  In vivo walking produced the highest overall wear rates, which were determined to be three times higher than ISO walking.
• 2
  Moderate wear rates were determined for walking upstairs and downstairs.
• 3
  Low wear rates were determined for standing up/sitting down and cycling at power levels of 50 W and 120 W.