Ms. c is an 18-year-old who is 3 days post-acl reconstruction. she must wear a knee immobilizer during ambulation with axillary crutches and must remain partial weight bearing on the involved side. she has limited passive and active motion of the operated knee. according to the icf model of functioning and disability, her limited knee rom is classified as a: a. secondary impairment of body structure. b. primary impairment of body function. c. secondary impairment of body structure. d. secondary impairment of body function.