Hogen mainly missed the point. I've found no info about ski width relating to bone size.
Here is the original Slovenian scientific paper:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4541126/Conclusion:
The changed biomechanical conditions that occurred in the transition to a different ski width caused a change in the knee joint kinematics, and it appears that two different motion strategies were formed depending on the ski width. The strategy using narrow skis was a more pronounced knee abduction, while using medium and wider skis caused progressively increased knee external rotation (less internal). Both of these strategies most probably occurred due to the changed point of application of the ground reaction force. Furthermore, based on the results of the current study, it can be plausibly argued that the use of wider skis or, in particular, skis with a large waist width, on a hard or frozen surface as was the case in this study, could force the knee joint closer to the end of range of motion in transversal and frontal planes. In addition, using wider skis on a hard frozen snow may increase the potential risk of degenerative knee injuries; however the latter needs further justification. Such hard snow conditions are characteristic for most prepared ski slopes, especially in recent times when natural snow is lacking and has to be substituted with considerably more compact artificial snow. Finally, the overall results of the abduction and internal rotation in respect to turn radii and ground reaction forces indicated that the knee joint movements are likely one of the key points in alpine skiing technique.Here is the Montana State University video with research based on the Slovenian data:
https://www.youtube.com/watch?v=ynVcTIHPkUoTwo of the take-aways here are that wide skis changed skier's style and PSIA L2 & L3 candidates had poorer scores on wide skis.
Bottom line: Narrow skis are always better unless flotation is needed in deep snow (probably >6").