<![CDATA[Journal of Orthopaedic & Sports Physical Therapy - Jack Crosbie, PhD, MSc, GradDipPhys, DipTP]]> http://www.jospt.org/jackcrosbie en-us (c) 2011 Wed, 30 Apr 2008 09:05:25 EST http://feedvalidator.org/docs/rss2.html www.eResources.com (Generator) jospt@eresources.com (JOSPT) jospt@eresources.com (eResources) 0 Relationship Between Functional Ankle Instability and Postural Control http://www.jospt.org/issues/articleID.2260/article_detail.asp Marcos de Noronha, Kathryn M. Refshauge, Jack Crosbie, Sharon L. Kilbreath
STUDY DESIGN: Controlled laboratory study using a cross-sectional design. OBJECTIVES: To investigate the relationship between postural control and functional ankle instability during a hop-landing task, and to investigate whether postural control is altered in people with functional ankle instability. METHODS AND MEASURES: Sixty volunteers classified by the Cumberland Ankle Instability Tool (CAIT) scores formed the external control group (CAIT score, ≥ 28, n = 31) and the instability group (CAIT score, ≤ 27 and history of at least 1 ankle sprain; n = 29). Postural control was measured with the landing test, in which participants stood on 1 lower extremity for 3 seconds on a step, then hopped down onto a force plate and regained postural stability after landing. The main outcome measurements were time to stability (TTS) after landing for ankle inversion, dorsiflexion, and summated electromyographic (EMG) signal amplitude for the tibialis anterior, soleus, and fibularis longus. The secondary outcomes were the proportion of movement in the frontal plane for hip and ankle, the variability of inversion movement prior to hopping, and the variables from ground reaction force. RESULTS: There were no associations (P > .05) between the CAIT scores and the TTS for ankle inversion (r = -0.25), dorsiflexion (r = -0.04), summated EMG (r = -0.13) and proportion of movement in the frontal plane (r = 0.005). Participants in the instability group took longer to regain stability in inversion and displayed greater inversion variability prejump than the control group (P = .05 and .009, respectively). CONCLUSIONS: Ankle inversion control is affected in people with functional ankle instability in tasks of postural control after landing from a hop.

J Orthop Sports Phys Ther. 2008;38(12):782-789, published online 24 October 2008. doi:10.2519/jospt.2008.2766

KEY WORDS: ankle injuries, ankle sprain, joint instability, postural control]]> Fri, 24 Oct 2008 00:00:00 EST http://www.jospt.org/issues/articleID.2260/article_detail.asp Comparative Kinematics of Two Walking Frame Gaits http://www.jospt.org/issues/articleID.1113/article_detail.asp Jack Crosbie

Walking frames are commonly used as part of the gait rehabilitation process for a variety of clinical conditions. There has been little investigation of the characteristics of gait with such frames or of the advantages of one gait style compared with others. The kinematics of 2 simulated gait patterns with walking frames were investigated using conventional video analysis techniques. The purpose of the study was to compare the 2 gaits with respect to patterns of joint motion and temporospatial parameters. It was found that simultaneous motion of the protected limb and the frame during stepping (gait S) permitted a faster walking speed than a gait in which the frame and the protected limb were moved separately (gait D). Although the patterns of hip motion in both aided gaits differed markedly from that found in free gait, gait S encouraged more hip extension on the protected side than gait D. Since this is seen as a desirable feature in gait retraining, patients using walking frames, particularly after hip trauma, should be assessed carefully and encouraged to use gait pattern S when possible.

J Orthop Sports Phys Ther. 1994;20(4):186-192.

Key Words: gait, biomechanics, walking aids

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