1. In Vivo Length Changes of the Proximal Interphalangeal Joint Proper and Accessory Collateral Ligaments During Flexion 
Jing Chen, MD, Jun Tan, MD, Ai Xian Zhang, MD 
Journal of Hand Surgery 
Volume 40, Issue 6, Pages (June 2015)
DOI: /j.jhsa
Copyright © 2015 American Society for Surgery of the Hand Terms and Conditions

2. Figure 1
Kinematics of the PIP joint were studied at 5 positions during flexion with a custom-designed nonmetallic supporting frame.
Journal of Hand Surgery  , DOI: ( /j.jhsa )
Copyright © 2015 American Society for Surgery of the Hand Terms and Conditions

3. Figure 2
The origins A and insertions B of the radial PCL and ACL of the PIP joint of the index finger. dp-o, origin of dorsal PCL; vp-o, origin of volar PCL; a-o, origin of ACL; ma-i, insertion of middle ACL; pa-i, insertion of proximal ACL; dp-i, insertions of dorsal PCL; vp-i, insertion of volar PCL; da-i, insertion of distal ACL; CA, concave area head of the proximal phalanx.
Journal of Hand Surgery  , DOI: ( /j.jhsa )
Copyright © 2015 American Society for Surgery of the Hand Terms and Conditions

4. Figure 3
The abridged general view of orientation of PCL and ACL at extension A and 90° flexion B of the PIP joint. Blue, dorsal portion of PCL; yellow, volar portion of PCL; green, ACL.
Journal of Hand Surgery  , DOI: ( /j.jhsa )
Copyright © 2015 American Society for Surgery of the Hand Terms and Conditions

5. Figure 4
Line graphs showing the change in the lengths of the radial PCL A, ulnar PCL B, radial ACL C, and ulnar ACL D of the PIP joint during flexion. FF, full flexion. Blue line, dorsal portion of PCL; red line, volar portion of PCL; green line, distal portion of ACL; yellow line, middle portion of ACL; purple line, proximal portion of ACL.
Journal of Hand Surgery  , DOI: ( /j.jhsa )
Copyright © 2015 American Society for Surgery of the Hand Terms and Conditions

6. Figure 5
Three-dimensional models of the PIP joint of a representative right index finger at 0° and 90° of flexion. A PA view. B Lateral view. The 3-dimensional paths of the dorsal (blue) and volar (yellow) portions of the PCL and the distal, middle, and proximal portions (green) are shown. d-PCL, dorsal portion of PCL; v-PCL, volar portion of PCL.
Journal of Hand Surgery  , DOI: ( /j.jhsa )
Copyright © 2015 American Society for Surgery of the Hand Terms and Conditions