In my recent response to Professor Robert W. Mann’s letter to the editor (1) regarding our theoretical study of a trapped lubricant pool during articular contact, I made the following statement regarding the study of Macirowski et al. (2):

The limitation of their study is that “Strains in the porous layer are assumed uniaxial, i.e., displacements of the matrix are constrained to the vertical (radial) direction” (1). It can be shown from the basic law of conservation of momentum that under the assumption of uniaxial displacement along the vertical direction, the gradient in fluid pressure can only vary along that same direction. Thus, from Darcy’s law, the direction of fluid flow can only occur in the vertical direction as well. Since the cartilage-bone interface is modeled as impermeable, the only direction in which the fluid...

1.
Ateshian
,
G. A.
, 2004, “
Response to Dr. Robert W. Mann
,”
J. Biomech. Eng.
0148-0731,
126
, p.
539
.
2.
Macirowski
,
T.
,
Tepic
,
S.
, and
Mann
,
R. W.
, 1994, “
Cartilage Stresses in the Human Hip Joint
,”
J. Biomech. Eng.
0148-0731,
116
, pp.
10
18
.
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