In the Carvalho v. Carvalho (2016 ONSC 1641) decision, a payor met with a motor vehicle accident and sought to vary his child support terms based upon it. The courts analyzed the information that they had on the injuries of the payor and concluded that given the temporary nature of the injuries, no variation in support payments shall be made.
http://www.canlii.org/en/on/onsc/doc/2016/2016onsc1641/2016onsc1641.html