Inclinometer

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J Hildebrandt - One of the best experts on this subject based on the ideXlab platform.

Jie Huang - One of the best experts on this subject based on the ideXlab platform.

  • probing changes in tilt angle with 20 nanoradian resolution using an extrinsic fabry perot interferometer based optical fiber Inclinometer
    Optics Express, 2018
    Co-Authors: Yiyang Zhuang, Yizheng Chen, Rex E Gerald, Jie Huang
    Abstract:

    In this paper, we introduce and demonstrate a novel optical fiber extrinsic Fabry-Perot interferometer (EFPI) for tilt measurements with 20 nrad resolution. Compared with in-line optical fiber Inclinometers, an extrinsic sensing structure is used in the Inclinometer reported herein. Our design greatly improves on the tilt angle resolution, the temperature stability, and the mechanical robustness of Inclinometers with advanced designs. An EFPI cavity, which is formed between endfaces of a suspended rectangular mass block and a fixed optical fiber, is packaged inside a rectangular container box with an oscillation dampening mechanism. Importantly, the two reflectors of the EFPI sensor remain parallel while the cavity length of the EFPI sensor meters a change in tilt. According to the Fabry-Perot principle, the change in the cavity length can be determined, and the tilt angle of the Inclinometer can be calculated. The sensor design and the measurement principle are discussed. An experiment based on measuring the tilt angle of a simply-supported 70-cm beam induced by a small load is presented to verify the resolution of our prototype Inclinometer. The experimental results demonstrate significantly higher resolution (ca. 20 nrad) compared to commercial devices. The temperature cross-talk of the Inclinometer was also investigated in a separate experiment and found to be 0.0041 μrad /°C. Our Inclinometer was also employed for monitoring the daily periodic variations in the tilt angle of a windowsill in a cement building caused by local temperature changes during a five-day period. The multi-day study demonstrated excellent stability and practicability for the novel device. The significant Inclinometer improvements in differential tilt angle resolution, temperature compensation, and mechanical robustness also provide unique opportunities for investigating spatial-temporal modulations of gravitational fields.

Nicolas Duval - One of the best experts on this subject based on the ideXlab platform.

  • VERTICAL ACETABULAR POSITIONING WITH THE AID OF AN Inclinometer IN TOTAL HIP ARTHROPLASTY
    2005
    Co-Authors: P.a. Vendittoli, Martin Lavigne, Nicolas Duval
    Abstract:

    Introduction and Aims: Vertical acetabular cup positioning is an important technical aspect in total hip arthroplasty. It has been reported that acetabular component malpositioning is associated with an increased risk of dislocation, limited range of motion and impingement. A high vertical acetabular angle is correlated positively with premature polyethylene wear, osteolysis and early aseptic loosening in metal-polyethylene and ceramic-ceramic interface. Method: To evaluate the potential benefit of using an Inclinometer in vertical acetabular cup positioning, 96 patients were randomised to have their acetabular cup insertions done with an Inclinometer or by visuo-spatial perception alone. The surgeries were performed by five hip surgeons. Results: The precision of the acetabular vertical angles averaged 43 degrees +/-6.7 by visuo-spatial perception alone and 44 degrees +/-6.8 with the Inclinometer. With the Inclinometer and by visuo-spatial perception respectively, 12.8% and 9.3% of the cups were outside a safe angle range of 35–54 degrees. The standard deviation was +/-4.9 degrees for the Inclinometer and +/-4.7 degrees for the visuo spatial perception method. Conclusion: The use of an Inclinometer is as precise as the visuo spatial perception of a hip surgeon. Positioning the cup with the Inclinometer did not reduce the variability or improve the precision of the vertical acetabular position during total hip arthroplasty, suggesting it is not an essential adjunct in the clinical practice of hip surgeons. However, the Inclinometer might be a valuable tool for surgeons performing a low volume of hip surgery.

  • Vertical acetabular positioning with an Inclinometer in total hip arthroplasty
    Journal of Arthroplasty, 2002
    Co-Authors: P.a. Vendittoli, Nicolas Duval, David James Stitson, Benoît Mâsse
    Abstract:

    Abstract Vertical acetabular implant positioning is an important technical aspect in total hip arthroplasty. To evaluate the potential benefit of an Inclinometer, 50 cup insertions were done on a cadaver pelvis. Acetabular cup vertical angles averaged 44.4° ± 11.4° by visuospatial perception and 42.2° ± 3.8° with the Inclinometer. All cups were within the safe angle range of 40° to 49° with the Inclinometer compared with 64% of cups by visuospatial perception. Use of the Inclinometer reduced variability by a factor of 2.0 to 4.5. The addition of an Inclinometer for acetabular cup insertion increases the probability of positioning the cup within a vertical safe range during total hip arthroplasty on a cadaver pelvis, suggesting that it could be a useful adjunct in clinical practice. Copyright 2002, Elsevier Science (USA). All rights reserved.

P.a. Vendittoli - One of the best experts on this subject based on the ideXlab platform.

  • VERTICAL ACETABULAR POSITIONING WITH THE AID OF AN Inclinometer IN TOTAL HIP ARTHROPLASTY
    2005
    Co-Authors: P.a. Vendittoli, Martin Lavigne, Nicolas Duval
    Abstract:

    Introduction and Aims: Vertical acetabular cup positioning is an important technical aspect in total hip arthroplasty. It has been reported that acetabular component malpositioning is associated with an increased risk of dislocation, limited range of motion and impingement. A high vertical acetabular angle is correlated positively with premature polyethylene wear, osteolysis and early aseptic loosening in metal-polyethylene and ceramic-ceramic interface. Method: To evaluate the potential benefit of using an Inclinometer in vertical acetabular cup positioning, 96 patients were randomised to have their acetabular cup insertions done with an Inclinometer or by visuo-spatial perception alone. The surgeries were performed by five hip surgeons. Results: The precision of the acetabular vertical angles averaged 43 degrees +/-6.7 by visuo-spatial perception alone and 44 degrees +/-6.8 with the Inclinometer. With the Inclinometer and by visuo-spatial perception respectively, 12.8% and 9.3% of the cups were outside a safe angle range of 35–54 degrees. The standard deviation was +/-4.9 degrees for the Inclinometer and +/-4.7 degrees for the visuo spatial perception method. Conclusion: The use of an Inclinometer is as precise as the visuo spatial perception of a hip surgeon. Positioning the cup with the Inclinometer did not reduce the variability or improve the precision of the vertical acetabular position during total hip arthroplasty, suggesting it is not an essential adjunct in the clinical practice of hip surgeons. However, the Inclinometer might be a valuable tool for surgeons performing a low volume of hip surgery.

  • Vertical acetabular positioning with an Inclinometer in total hip arthroplasty
    Journal of Arthroplasty, 2002
    Co-Authors: P.a. Vendittoli, Nicolas Duval, David James Stitson, Benoît Mâsse
    Abstract:

    Abstract Vertical acetabular implant positioning is an important technical aspect in total hip arthroplasty. To evaluate the potential benefit of an Inclinometer, 50 cup insertions were done on a cadaver pelvis. Acetabular cup vertical angles averaged 44.4° ± 11.4° by visuospatial perception and 42.2° ± 3.8° with the Inclinometer. All cups were within the safe angle range of 40° to 49° with the Inclinometer compared with 64% of cups by visuospatial perception. Use of the Inclinometer reduced variability by a factor of 2.0 to 4.5. The addition of an Inclinometer for acetabular cup insertion increases the probability of positioning the cup within a vertical safe range during total hip arthroplasty on a cadaver pelvis, suggesting that it could be a useful adjunct in clinical practice. Copyright 2002, Elsevier Science (USA). All rights reserved.

Petra Saur - One of the best experts on this subject based on the ideXlab platform.

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