Experimental Mechanics

, Volume 35, Issue 2, pp 166–173 | Cite as

The spatial and pressure resolution of fuji pressure-sensitive film

  • A. B. Liggins
  • W. R. Hardie
  • J. B. Finlay
Article

Abstract

Due to its ease of application, Fuji prescale pressure-sensitive film is currently one of the more popular methods, within the biomechanics community, for assessing contact areas and pressures within articulating joints—in addition to its use in industry. This material produces a stain on the application of pressure due to the rupture of microscopic bubbles releasing a liquid which, in turn, causes patches of color to be formed; a greater pressure produces a darker stain. These stains are often converted into digital images and manipulated to produce false-color pressuremaps, an approach which is beyond the simple methods of analysis suggested by the manufacturer. Due to the granular nature of Fuji film stains, the two user-defined variables which will determine the accuracy of any pressure-map are: (a) the size of the sample-area used to capture data from the original stain during the digitization process and (b) the number of pressure-intervals identified on each map; the chosen values should match the spatial and pressure resolutions of the film. Despite the importance of these factors, the literature presents a bewildering array of values, particularly for the number of pressure-intervals, with no validation of those chosen; consequently, little guidance is provided for other potential users of Fuji film. This paper discusses the relationship between sample-area and pressure-interval and introduces a method for examining their effect on the resulting pressure-maps. The results obtained using ‘Super Low’ grade Fuji film suggest that the authors of some previously reported methods may have been overambitious in their choice of sample-area and pressure-intervals. Finally, a series of suggested values of sample-area size and pressure-intervals are provided.

Keywords

Color Mechanical Engineer Fluid Dynamics Digital Image Contact Area 

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References

  1. 1.
    Liggins, A.B. andFinlay, J.B., “Recording Contact Areas and Pressures in Joint Interfaces,”Experimental Mechanics: Technology Transfer Between High Tech Engineering and Biomechanics, ed. E.G. Little Elsevier Science Publishers, Amsterdam, 71–88 (1992).Google Scholar
  2. 2.
    Stormont, T.J., An, K.N., Morrey, B.F. andChao, E.Y., “Elbow Joint Contact Study: Comparison of Techniques,”J. Biomech.,18 (5),329–336 (1985).Google Scholar
  3. 3.
    Simon, W.H., “Scale Effects in Animal Joints,”Arth. Rheu.,13 (3),244–255 (1970).Google Scholar
  4. 4.
    Manouel, M., Pearlman, H.S., Balakhlef, A. andBrown, T.D., “A Miniature Piezoelectric Polymer Transducer for in vitro Measurement of the Dynamic Contact Stress Distribution,”J. Biomech.,25 (6),627–635 (1992).Google Scholar
  5. 5.
    Inaba, M. andArai, M., “A Method for Measuring Contact Pressures Instantaneously in Articular Joints,”J. Biomech.,22 (11),1293–1296 (1989).Google Scholar
  6. 6.
    Ahmed, A.M. andBurke, D.L., “In-vitro Measurement of Static Pressure Distribution in Synovial Joints-Part I: Tibial Surface of the Knee,”J. Biomech. Eng.,105,216–225 (1983).Google Scholar
  7. 7.
    Frisina, W. andLehneis, HR., “Pressure Mapping: A Preliminary Report,”J. Biomech.,3 (6),526–528 (1970).Google Scholar
  8. 8.
    Bourgois, R. andBel, J., “A New Cheap Pressure Foil,”Strain,29 (1),27–28 (1993).Google Scholar
  9. 9.
    Afoke, N.Y.P., Byers, P.D. andHutton, W.C., “Contact Pressures in the Human Hip Joint,”J. Bone and Joint Surg.,69B (4),536–541 (1987).Google Scholar
  10. 10.
    Haut, RC., “Contact Pressures in the Patellofemoral Joint During Impact Loading on the Human Flexed Knee,”J. Orthop. Res.,7 (2),272–280 (1989).Google Scholar
  11. 11.
    Fukubayashi, T. andKurosawa, H., “The Contact Area and Pressure Distribution Pattern of the Knee: A Study of Normal and Osteoarthrotic Knees,”Acta Orthop. Scand.,51,871–879 (1980).Google Scholar
  12. 12.
    Hehne, H.J., Ficker, E., Jantz, W., Mahr, D. andSchopf, HJ., “A New Method for Measurements of Pressure Distributions and Contact Areas in Joints,”Morphol. Med.,1,95–106 (1981).Google Scholar
  13. 13.
    Wagner, U.A., Sangeorzan, B.J., Harrington, R.M. andTencer, A.F., “Contact Characteristics of the Subtalar Joint: Load Distribution Between the Anterior and Posterior Facets,”J. Orthop. Res.,10 (4),535–543 (1992).Google Scholar
  14. 14.
    Werner, F.W., Murphy, D.J. andPalmer, A.K., “Pressures in the Distal Radioulnar Joint: Effect of Surgical Procedures Used for Kienbock's Disease,”J. Orthop. Res.,7 (3),445–450 (1989).Google Scholar
  15. 15.
    Tencer, A.F., Viegas, S.F., Cantrell, J., Chang, M., Clegg, P., Hicks, C., O'Meara, C. andWilliamson, J.B., “Pressure Distribution in the Wrist Joint,”J. Orthop. Res.,6 (4),509–517 (1988).Google Scholar
  16. 16.
    McNamara, J.L., Collier, J.P., Mayor, M.B. andJensen, R.E., “A Comparison of Contact Pressures in Tibial and Patellar Total Knee Components Before and After Service in vivo,”Clin. Orthop.,299,104–113 (1994).Google Scholar
  17. 17.
    Singerman, R.J., Pedersen, D.R. andBrown, T.D., “Quantitation of Pressure-sensitive Film Using Digital Image Scanning,”Experimental Mechanics,27 (1),99–105 (1987).Google Scholar
  18. 18.
    Ronsky, J.L., Herzog, W., Brown, T.D. andLeonard, T., “In-vivo Determination of Patellofemoral Joint Contact Pressures,”J. Biomech.,26 (3),352 (1993).Google Scholar
  19. 19.
    Brown, T.D., Pope, D.F., Hale, J.E., Buckwater, J.A. andBrand, R.A., “Effects of Osteochondral Defect Size on Cartilage Contact Stress,”J. Orthop. Res.,9 (4),559–567 (1991).Google Scholar
  20. 20.
    Hehne, H.J., Haberland, H., Hultzsch, W. andJantz, W., “Measurements of Two Dimensional Pressure Distributions and Contact Areas of a Joint Using a Pressure Sensitive Foil,”Biomechanics: Principles and Applications, ed. R. Huiskes, D.H. Van Campen andJ.R. De Wijn Martinus Nijhoff, The Hague, 197–203 (1982).Google Scholar
  21. 21.
    Sangeorzan, B.J., Wagner, U.A., Harrington, R.M. andTencer, A.F., “Contact Characteristics of the Subtalar Joint: The Effect of Talar Neck Misalignment,”J. Orthop. Res.,10 (4),544–551 (1992).Google Scholar
  22. 22.
    Hale, J.E. andBrown, T.D., “Contact Stress Gradient Detection Limits of Pressensor Film,”J. Biomech. Eng.,114 (3),352–357 (1992).Google Scholar
  23. 23.
    Pan, H.Q., Kish, V., Boyd, R.D., Burr, D.B. andRadin, E.L., “The Maquet Procedure: Effect of Tibial Shingle Length on Patellofemoral Pressures,”J. Orthop. Res.,11 (2),199–204 (1993).Google Scholar
  24. 24.
    Marder, R.A., Swanson, T.V., Sharkey, N.A. andDuwelius, P.J., “Effects of Partial Patellectomy and Reattachment of the Patellar Tendon on Patellofemoral Contact Areas and Pressures,”J. Bone and Joint Surg.,75A (1),35–45 (1993).Google Scholar
  25. 25.
    Liggins, A.B., Stranart, J.C.E., Finlay, J.B. andRorabeck, C.H., “Calibration and Manipulation of Data from Fuji Pressure-sensitive Film,”Experimental Mechanics: Technology Transfer Between High Tech Engineering and Biomechanics, ed. E.G. Little, Elsevier Science Publishers, Amsterdam, 61–70 (1992).Google Scholar
  26. 26.
    Caldwell, N.J., Hale, J.E., Rudert, J.M. andBrown, T.D., “An Algorithm for Approximate Crinkle Artifact Compensation in Pressure-sensitive Film Recordings,”J. Biomech.,26 (8),1001–1009 (1993).Google Scholar
  27. 27.
    Wonnacott, T.H. andWonnacott, R.J., Introductory Statistics, 5th Ed., John Wiley and Sons, Toronto, 266 (1990).Google Scholar

Copyright information

© Society for Experimental Mechanics, Inc. 1995

Authors and Affiliations

  • A. B. Liggins
    • 1
  • W. R. Hardie
    • 1
  • J. B. Finlay
    • 1
  1. 1.Department of SurgeryUniversity of Western OntarioLondonCanada

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