The Relationship Between Foot Structure and Ankle Laxity
Mentor 1
Stephen Cobb
Location
Union Wisconsin Room
Start Date
24-4-2015 2:30 PM
End Date
24-4-2015 3:45 PM
Description
There is a general clinical belief that an individual’s foot structure influences, or is influenced by, his/her ankle joint laxity. However, the relationship has not been investigated using foot structure and ankle joint laxity assessment instruments that have moderate-high intra-and inter-tester reliability. The purpose of this study is to determine the relationship between foot structure and ankle joint laxity. 20 participants (Age: 18-40 years) with no history of ankle or foot injury, major lower extremity surgery, or current hip or knee injury will be recruited. Foot structure will be assessed using an iPad based Digital Photographic Measurement Method (DPMM). The DPMM consists of identifying anatomical landmarks and photographing the foot during 10% and 90% weight bearing conditions. Ankle joint laxity (anterior, posterior, inversion, eversion) will be assessed using a Hollis portable ankle arthrometer (Blue Bay Research Inc, Navarre, FL). During anterior and posterior testing, the foot will be loaded with 125 Newtons in each direction. Similarly, during the inversion and eversion testing, the foot will be loaded with four Newton Meters of torque. Four trials will be completed in each direction and the average of the three most consistent trials will be taken for subsequent data analysis. All of the foot structure and ankle laxity measurements will be performed bilaterally. Intraclass correlation coefficients (ICC) (3,1) (v. 19; SPSS Inc. Chicago, IL) will be performed to determine the relationship between foot structure during 10% and 90% weight bearing and each of the ankle joint laxity measures. The ICC threshold for a moderate relationship was defined as equal to or greater than 0.70. The results of this study will further the understanding of the relationship between foot structure and ankle joint laxity.
The Relationship Between Foot Structure and Ankle Laxity
Union Wisconsin Room
There is a general clinical belief that an individual’s foot structure influences, or is influenced by, his/her ankle joint laxity. However, the relationship has not been investigated using foot structure and ankle joint laxity assessment instruments that have moderate-high intra-and inter-tester reliability. The purpose of this study is to determine the relationship between foot structure and ankle joint laxity. 20 participants (Age: 18-40 years) with no history of ankle or foot injury, major lower extremity surgery, or current hip or knee injury will be recruited. Foot structure will be assessed using an iPad based Digital Photographic Measurement Method (DPMM). The DPMM consists of identifying anatomical landmarks and photographing the foot during 10% and 90% weight bearing conditions. Ankle joint laxity (anterior, posterior, inversion, eversion) will be assessed using a Hollis portable ankle arthrometer (Blue Bay Research Inc, Navarre, FL). During anterior and posterior testing, the foot will be loaded with 125 Newtons in each direction. Similarly, during the inversion and eversion testing, the foot will be loaded with four Newton Meters of torque. Four trials will be completed in each direction and the average of the three most consistent trials will be taken for subsequent data analysis. All of the foot structure and ankle laxity measurements will be performed bilaterally. Intraclass correlation coefficients (ICC) (3,1) (v. 19; SPSS Inc. Chicago, IL) will be performed to determine the relationship between foot structure during 10% and 90% weight bearing and each of the ankle joint laxity measures. The ICC threshold for a moderate relationship was defined as equal to or greater than 0.70. The results of this study will further the understanding of the relationship between foot structure and ankle joint laxity.
