Tissue engineering approaches to degenerative disc disease – A meta-analysis of controlled animal trials  A. Mehrkens, A.M. Müller, V. Valderrabano, S.

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Tissue engineering approaches to degenerative disc disease – A meta-analysis of controlled animal trials  A. Mehrkens, A.M. Müller, V. Valderrabano, S. Schären, P. Vavken  Osteoarthritis and Cartilage  Volume 20, Issue 11, Pages 1316-1325 (November 2012) DOI: 10.1016/j.joca.2012.06.001 Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 1 Shows a forest plot for disc height restoration as measured by DHI. The tested intervention was the treatment of nucleotomized discs with cells and biomaterials. The two columns on the right show the outcome as WMD(with 95% confidence interval) in DHI for the individual studies, as well as the weight, as a function of the variance of the estimate, each study has in the pooled WMD (last row). The center of the figure shows a graphic representation of the numerical outcomes, i.e., plots of the 95% CIs as horizontal bars. If the 95% CI-bar crosses the vertical black line of WMD = 0, then there is no statistically significant difference between the two groups assessed in the respective study. If the bar is entirely to the left or right of the “0” line, then there is significant effect in favor of tissue engineered treatment with cells and biomaterials (right) or in favor of the nucleotomized, control group (left). The pooled effect of all studies is given as the blue diamond at the bottom of the graph, with the same rules applying. Osteoarthritis and Cartilage 2012 20, 1316-1325DOI: (10.1016/j.joca.2012.06.001) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 2 Shows a forest plot for disc height restoration as measured by DHI, change in height in percent, and change in mm. The tested intervention was the treatment of nucleotomized discs with cells only. A significant effect of cells on disc height can be seen for DHI, change in percent, and change in mm. Osteoarthritis and Cartilage 2012 20, 1316-1325DOI: (10.1016/j.joca.2012.06.001) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Fig. 3 Shows a forest plot for disc height restoration as measured by DHI, change in height in percent, and change in mm. The tested intervention was the treatment of nucleotomized discs with a biomaterial only. A significant effect of cells on disc height can be seen for DHI and change in mm. But not change in percent since the 95% CI contains the value zero for the pooled WMD. Osteoarthritis and Cartilage 2012 20, 1316-1325DOI: (10.1016/j.joca.2012.06.001) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions

Flow chart Osteoarthritis and Cartilage 2012 20, 1316-1325DOI: (10.1016/j.joca.2012.06.001) Copyright © 2012 Osteoarthritis Research Society International Terms and Conditions