T.A. Schmidt, Ph.D., R.L. Sah, M.D., Sc.D. 

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Effect of synovial fluid on boundary lubrication of articular cartilage  T.A. Schmidt, Ph.D., R.L. Sah, M.D., Sc.D.  Osteoarthritis and Cartilage  Volume 15, Issue 1, Pages 35-47 (January 2007) DOI: 10.1016/j.joca.2006.06.005 Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Diagram of harvest location, specimen preparation and lubricant bath incubation, and friction testing. Blocks were harvested from the patellofemoral groove of mature bovine stifle joints (A) from which osteochondral annulus (ann) and core sample (B) were prepared. Sample pairs were incubated in the test bath solution (PBS or SF) at 4°C for 24–48h (C) prior to friction testing (D). Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Lubrication test protocols defined by stress relaxation duration (Tsr), compression (1−ΛZ), effective sliding velocity (veff), and pre-sliding duration (Tps). Samples were compressed axially by 1−ΛZ=18% (A, E, and G), or 12%, 18%, and 24% (C) of the total cartilage thickness. Rotational test protocols were then respectively used to determine the effects of Tsr (B), 1−ΛZ and veff (D), Tps (F), and fluid depressurization (H) on the lubrication properties of articular cartilage for PBS and/or SF lubricants. Schematics (B, D, and F), only show + test revolution sequence, as the identical − test sequence proceeded subsequently with revolutions in the opposite direction. Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Torque (A, B with log scale insets to show values at small rotation angles) and axial load (C and D) measurements vs rotation in test baths of PBS and SF at 18% compression (1−ΛZ) after 2, 7, 13, 29, 44, and 60min stress relaxation duration (Tsr), at an effective sliding velocity (veff) of 0.3mm/s with a 120s pre-sliding duration (Tps). Mean±s.e.m., n=4. Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 4 Static, μstatic (A), μstatic,Neq (B), and kinetic, 〈μkinetic〉 (C) friction coefficients in PBS and SF at 18% compression (1−ΛZ) after 2, 7, 13, 29, 44, and 60min stress relaxation duration (Tsr), at an effective sliding velocity (veff) of 0.3mm/s with a 120s pre-sliding duration (Tps). Mean±s.e.m., n=4. Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 5 Torque (A, B with log scale insets to show values at small rotation angles) and axial load (C and D) measurements vs rotation in test baths of PBS and SF at 18% compression (1−ΛZ) after 60min stress relaxation duration (Tsr), at effective sliding velocities (veff) of 3, 1, 0.3, and 0.1mm/s with a 120s pre-sliding duration (Tps). Mean±s.e.m., n=4. Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 6 Static, μstatic,Neq (A), and kinetic, 〈μkinetic〉 (B), 〈μkinetic,Neq〉 (C) friction coefficients in PBS and SF at 12%, 18%, and 24% compression (1−ΛZ) after 60min stress relaxation duration (Tsr), at effective sliding velocities (veff) of 3, 1, 0.3, and 0.1mm/s with a 120s pre-sliding duration (Tps). Mean±s.e.m., n=4. Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 7 Torque (A, B with log scale insets to show values at small rotation angles) and axial load (C and D) measurements vs rotation in test baths of PBS and SF at 18% compression (1−ΛZ) after 60min stress relaxation duration (Tsr), at an effective sliding velocity (veff) of 0.3mm/s with a 3600, 1200, 120, 12, and 1.2s pre-sliding duration (Tps). Mean±s.e.m., n=4. Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 8 Static, μstatic,Neq (A), and kinetic, 〈μkinetic〉 (B), 〈μkinetic,Neq〉 (C) friction coefficients in PBS and SF at 18% compression (1−ΛZ) after 60min stress relaxation duration (Tsr), at an effective sliding velocity (veff) of 0.3mm/s with a 3600, 1200, 120, 12, and 1.2s pre-sliding duration (Tps). Mean±s.e.m., n=4. Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions

Fig. 9 Axial load measurements following 18% compression (1−ΛZ) (A) vs time and stress relaxation duration (Tsr). Axial load (B) and torque (with log scale insets) (C) measurements, and resulting friction coefficient μ (with log scale insets) (D), vs rotation at 1−ΛZ=18% after Tsr=60min, at an effective sliding velocity (veff) of 3mm/s with a 120s pre-sliding duration (Tps), in a test bath of SF. Axial load measurements following rotation (E) vs time and Tsr. Mean±s.e.m., n=4. Osteoarthritis and Cartilage 2007 15, 35-47DOI: (10.1016/j.joca.2006.06.005) Copyright © 2006 Osteoarthritis Research Society International Terms and Conditions