Wearing a walking boot for broken ankle now knee on other leg hurts?

Weight distribution: Now you are putting more weight on the other unaffected leg , this maldistribution is causing pain , speak to you orthopedic surgeon , and teach you how to balance better

Unequal leg lengths: Usally those boots make the leg a bit longer on the injured side so this throws off the gait and can put extra stress on the opposite side / a shoe with a thicker sole may help sketchers are a brand that has somewhat thicker soles and these some times help talk to your orthopedist about this good luck.