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Research ArticleFull Length Article
Open Access

ProDisc-L learning curve: 24-Month clinical and radiographic outcomes in 44 consecutive cases

Jeffrey B. Low, Jerry Du, Kai Zhang and James J. Yue
International Journal of Spine Surgery January 2012, 6 184-189; DOI: https://doi.org/10.1016/j.ijsp.2012.07.001
Jeffrey B. Low
Yale Orthopedics/Spine Service, New Haven, CT
AB
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  • For correspondence: jeffrey.low@yale.edu
Jerry Du
Yale Orthopedics/Spine Service, New Haven, CT
BS
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Kai Zhang
Yale Orthopedics/Spine Service, New Haven, CT
MD
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James J. Yue
Yale Orthopedics/Spine Service, New Haven, CT
MD
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Article Figures & Data

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  • Fig. 1
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    Fig. 1

    Learning curve as shown by logarithmic correlation between surgery series and operative time.

  • Fig. 2
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    Fig. 2

    Twenty-four–month follow-up parameters versus preoperative measurements. ODI, VAS, SF-12 PC, SF-12 MC, and satisfaction are graded on their respective scales. Disc heights are given in millimeters. Range of motion is given in degrees. (post op, postoperative; pre op, preoperative.)

  • Fig. 3
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    Fig. 3

    Comparison of 24-month follow-up parameter values for early and later groups. ODI, VAS, SF-12 PC, SF-12 MC, and satisfaction are graded on their respective scales. Disc heights are given in millimeters. Range of motion is given in degrees.

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    Table 1

    Comparison of demographics and preoperative clinical and radiographic parameters between groups A and B

    Group AGroup BP value
    No. of patients2222—
    Mean age (y)35.2 ± 7.737.7 ± 7.8.29
    No. of male patients1514—
    No. female patients78—
    Preoperative ODI (0–50)33.6 ± 6.432.1 ± 6.3.44
    Preoperative VAS (0–10)7.2 ± 1.77.9 ± 1.9.21
    Preoperative SF-12 PC (0–100)29.2 ± 5.227.7 ± 4.5.31
    Preoperative SF-12 MC (0–100)42.8 ± 10.441.4 ± 12.7.70
    Preoperative anterior disc height (mm)15.7 ± 5.814.4 ± 5.2.47
    Preoperative posterior disc height (mm)6.8 ± 2.36.9 ± 2.5.93
    Preoperative range of motion (°)9.7 ± 5.96.2 ± 5.8.07
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    Table 2

    Comparison of intraoperative parameters between groups A and B

    Group AGroup BP value
    Operative time (min)190.4 ± 40.5151.4 ± 31.4<.01
    Blood loss (mL)244.3 ± 150.8182.3 ± 86.8.10
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    Table 3

    Comparison of 24-month clinical and radiographic outcomes between groups A and B

    Group AGroup BP value
    ODI (0–50)14.7 ± 10.016.4 ± 11.8.63
    VAS (1–10)3.6 ± 2.94.3 ± 2.9.45
    SF-12 PC (1–100)40.4 ± 13.339.0 ± 13.1.75
    SF-12 MC (1–100)47.4 ± 11.549.1 ± 11.7.66
    Patient satisfaction (0–10)6.9 ± 3.77.0 ± 2.9.92
    Disc height anterior (mm)18.5 ± 4.518.7 ± 3.5.87
    Disc height posterior (mm)9.6 ± 2.010.7 ± 2.2.13
    Range of motion (°)4.6 ± 5.53.4 ± 2.7.67
    Deviation from midline (mm)2.81 ± 2.402.67 ± 1.56.86
    Rate of complications12.56
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International Journal of Spine Surgery
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1 Jan 2012
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ProDisc-L learning curve: 24-Month clinical and radiographic outcomes in 44 consecutive cases
Jeffrey B. Low, Jerry Du, Kai Zhang, James J. Yue
International Journal of Spine Surgery Jan 2012, 6 184-189; DOI: 10.1016/j.ijsp.2012.07.001

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ProDisc-L learning curve: 24-Month clinical and radiographic outcomes in 44 consecutive cases
Jeffrey B. Low, Jerry Du, Kai Zhang, James J. Yue
International Journal of Spine Surgery Jan 2012, 6 184-189; DOI: 10.1016/j.ijsp.2012.07.001
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