September 2018, page 13—The last sentences of the first paragraph of Charles W. McCutchen’s letter should read as follows: Loaded cartilage slowly loses pore fluid, but with each step the flexing and unloading of the joint and the bad fit of the cartilages to each other expose the surface of each to free fluid that it can resorb. I called this cycle “weeping lubrication” because cartilage weeps fluid when squeezed.
1.
C. W.
McCutchen
, Physics Today
71
(9
), 13
(2018
). © 2018 American Institute of Physics.
2018
American Institute of Physics
