Technical Briefs

Kinematic Differences in Posterior Stabilized Total Knees Determined by a Holistic Experimental Evaluation Method

[+] Author and Article Information
Anoop Kumar

Laboratory for Orthopaedic Implant Design,
Department of Orthopaedic Surgery,
Hospital for Joint Diseases,
New York, NY
Correspondence: mtl6@njit.edu

Manuscript received March 15, 2013; final manuscript received April 26, 2013; published online July 3, 2013. Assoc. Editor: Arthur G. Erdman.

J. Med. Devices 7(3), 030907 (Jul 03, 2013) (3 pages) Paper No: MED-13-1042; doi: 10.1115/1.4024506 History: Received March 15, 2013; Revised April 26, 2013

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Varadarajan, K. M., Harry, R. E., Johnson, T., and Li, G., 2010, “Can In Vitro Systems Capture the Characteristic Differences Between the Flexion-Extension Kinematics of the Healthy and TKA Knee?,” Med Eng Phys., 31(8), pp. 899–906. [CrossRef]
Li, G., Most, E., Sultan, P. G., Schule, S., Zayontz, S., Park, S. E., and Rubash, H. E., 2004, “Knee Kinematics With a High-Flexion Posterior Stabilized Total Knee Prosthesis: An In Vitro Robotic Experimental Investigation,” JBJS Am., 86-A(8), pp. 1721–1729.
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Grahic Jump Location
Fig. 1

Schematic of the 'Desktop Knee Machine' for applying combinations of compressive, shear and torque forces across the knee at a range of flexion angles with respect to tibial and femoral axes. The components were constrained (C), unconstrained (U), or set (S) at the required angle (tibial slope or femoral flexion).

Grahic Jump Location
Fig. 2

For each knee, the central diagram shows the contacts at all flexion angles for compression load only; the surrounding 4 diagrams show contacts for anterior femoral shear, posterior shear, internal torque, and external torque, as indicated by arrows. M indicates the Medial side of the knee as shown from a top view.

Grahic Jump Location
Fig. 3

AP laxity curves for four PS designs. Medial and lateral condyles are graphed together to show differences in constraint from one compartment to the other.

Grahic Jump Location
Fig. 4

Rotational laxity data for four PS designs. Positive sense of rotation is defined as counter clockwise about the tibia when viewed from top view of the tibia.



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