1. Wear-lines and split-lines of human patellar cartilage: relation to tensile biomechanical properties 
W.C. Bae, Ph.D., V.W. Wong, B.S., J. Hwang, M.S., J.M. Antonacci, M.S., G.E. Nugent-Derfus, Ph.D., M.E. Blewis, M.S., M.M. Temple- Wong, Ph.D., R.L. Sah, M.D., Sc.D. 
Osteoarthritis and Cartilage 
Volume 16, Issue 7, Pages (July 2008)
DOI: /j.joca
Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

2. Fig. 1
(A) Split-lines (arrows) in human patellar cartilage are visible after pricking the articular surface with a conical awl, and oriented in (B) lateral-to-medial and (C) proximal-to-distal directions in the proximal and the lateral facets, respectively.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

3. Fig. 2
(A) Wear-lines (arrows) in human patellar cartilage are visible after India ink staining of the articular surface, and oriented in the proximal-to-distal direction throughout the surface of the patella, including (B) lateral and (C) proximal facets.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

4. Fig. 3
(A) Tensile samples can be prepared to yield four unique orientations with respect to the split-line and the wear-line orientations. (B) Predicted outcomes assuming dominance of either wear-line or split-line effects to lower tensile integrity.
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions

5. Fig. 4
(A) Equilibrium and (B) ramp moduli of four types of tensile samples, with unique directionality with respect to the split-line and the wear-line orientation (mean±s.e.m.).
Osteoarthritis and Cartilage  , DOI: ( /j.joca )
Copyright © 2007 Osteoarthritis Research Society International Terms and Conditions