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. Author manuscript; available in PMC: 2015 Jul 18.
Published in final edited form as: J Biomech. 2014 Apr 18;47(10):2452–2459. doi: 10.1016/j.jbiomech.2014.04.014

Figure 5.

Figure 5

Each principal component encodes a different kind of shape variation, illustrated here by adding ± 2 s.d. of PCs 1–4 to the mean shape. PC 1 encodes variation in axial area. PCs 2–4 each encode a different form of disc height variation, mixed with other kinds of variation.