The word "瘸腿" is formed by combining the character "瘸", meaning lame, which uses the sickness radical "疒" to indicate ailment, with the character "腿", meaning leg, which incorporates the body part radical "月" (from "肉" for flesh) to specify the affected area. Together, these characters create a compound that literally means "lame leg" and refers to a person with a limp or crippled leg.