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Advances in Orthopedics
Volume 2016 (2016), Article ID 7683272, 5 pages
http://dx.doi.org/10.1155/2016/7683272
Clinical Study

Impact of Active Ankle Movement Frequency on Velocity of Lower Limb Venous Flow following Total Hip Arthroplasty

1Department of Rehabilitation, Hokusuikai Kinen Hospital, Ibaraki, Japan
2Department of Orthopaedic Surgery, Hokusuikai Kinen Hospital, Ibaraki, Japan
3Department of Clinical Laboratory, Hokusuikai Kinen Hospital, Ibaraki, Japan

Received 26 September 2016; Accepted 18 October 2016

Academic Editor: Elizaveta Kon

Copyright © 2016 Tsutomu Nakayama et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. Although active ankle movement plays a predominant role in mechanical thromboprophylaxis following total hip arthroplasty (THA), the most effective frequency of movement remains unclear. Materials and Methods. In 29 consecutive patients undergoing THA, the velocity of blood flow in the profunda femoris was measured after various frequencies of ankle movement two days after THA using a pulse wave Doppler ultrasound system. To test the interobserver reliabilities for the velocity measured with Doppler ultrasound system, the intraclass correlation coefficient was calculated based on the measurement in 10 limbs of healthy volunteers. Results. At 0, 1, and 2 minutes after ankle movement, the velocity after movement at 60 contractions per minute was significantly faster than that after movement at 40 or 80 contractions per minute (, repeated-measures analysis of variance). The intraclass correlation coefficient score in two investigators was 0.849 (95% confidence interval, 0.428 to 0.962). Conclusions. Active ankle movement at 60 contractions per minute is recommended in patients receiving THA to obtain optimal venous blood flow.