The purpose of this investigation is to determine the effects of chronic ankle instability on cervical spine and knee proprioception as measured using joint position sense to investigate whether correlation can be drawn between the two.

• Chronic Ankle Instability
• Impaired Proprioception

Inclusion Criteria:

• History of ankle instability
• Ages 25-65 yoa

Exclusion Criteria:

• Recent surgery, have any unstable or fused joints of the cervical spine.
• Medications, prescription or herbal muscle stimulants, relaxants.
• Any previous cervical spine injury, surgery or condition affecting range of motion of the cervical spine.
• Any local infection, injury or other malignancy.
• Congenital conditions affecting the cervical spine, i.e. block vertebrae, Klippel feil syndrome.
• Any systemic illness that has an adverse effect on the cervical spine.
• A history of dizziness, light headedness or passing out.
• A history of neck or back injury.
• A history of serious automobile accident.
• Any spinal manipulation within 48 hours before testing or during the one week of testing.
• A score of less than 6 out 10 questions answered yes on the Functional Ankle Instability form (Appendix E) will disqualify the candidate for acceptance into the study.
• History of knee surgery and degenerative knee condition.