NDLI: Plantar flexor muscle weakness may cause stiff-knee gait.

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Plantar flexor muscle weakness may cause stiff-knee gait.

Advantages and disadvantages of stiffness instructions when studying postural control.

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Letter to the Editor: On 'Advantages and disadvantages of stiffness instructions when studying postural control' by C.T. Bonnet: Comments on 'Advantages and disadvantages of stiffness instructions when studying postural control'. (Part 1)

Letter to the Editor: On 'Advantages and disadvantages of stiffness instructions when studying postural control' by C.T. Bonnet: Comments on 'Advantages and disadvantages of stiffness instructions when studying postural control'. (Part 2)

Letter to the Editor: On 'Advantages and disadvantages of stiffness instructions when studying postural control' by C.T. Bonnet: You just can't win: Advantages and disadvantages of the postural stability requirement.

Advantages and disadvantages of stiffness instructions when studying postural control: Author response to the letter.

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Plantar flexor muscle weakness may cause stiff-knee gait.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Apti, Adnan Akalan, N. Ekin Kuchimov, Shavkat Özdinçler, Arzu Razak Temelli, Yener Nene, Anand
Description	Author Affiliation: Apti A ( Istanbul University, Institute of Health Sciences Cerrahpasa Tip Fakültesi Kampüsü, Saglik Bilimleri Enstitusu, Kocamustafapasa 34098, Istanbul, Turkey. Electronic address: adanapti@yahoo.com.); Akalan NE ( Istanbul University, Faculty of Health Sciences, Physiotherapy and Rehabilitation Division, Demirkapi Cad. Karabal Sk. Bakirkoy Ruh ve Sinir Hastaliklari Hastanesi Bakirkoy 34740, Istanbul, Turkey); Kuchimov S ( Bogazici University, Institute of Biomedical Engineering Bogazici University Institute of Biomedical Engineering Kandilli Kampus Cengelkoy 34684, Istanbul, Turkey. Electronic address: shavkatkuchimov@gmail.com.); Özdinçler AR ( Istanbul University, Faculty of Health Sciences, Physiotherapy and Rehabilitation Division, Demirkapi Cad. Karabal Sk. Bakirkoy Ruh ve Sinir Hastaliklari Hastanesi Bakirkoy 34740, Istanbul, Turkey. Electronic address: aozdincler@istanbul.edu.tr.); Temelli Y ( Istanbul University, Istanbul Faculty of Medicine, Department of Orthopaedics and Traumathology Ortopedi ve Travmatoloji Anabilim Dali Istanbul Tip Fakultesi Capa Fatih 34730, Istanbul, Turkey. Electronic address: ytemelli@gmail.com.); Nene A ( Roessingh Rehabilitation Centerr Roessinghsbleekweg 33, 7522 AH Enschede Netherlends. Electronic address: a.nene@roessingh.nl.)
Abstract	AIM: The iterative simulation studies proclaim that plantar flexor (PF) muscle weakness is one of the contributors of stiff knee gait (SKG), although, whether isolated PF weakness generates SKG has not been validated in able-bodied people or individuals with neuromuscular disorders. The aim of the study was to investigate the effects of isolated PF muscle weakness on knee flexion velocity and SKG in healthy individuals. METHOD: Twenty able-bodied young adults (23±3 years) participated in this study. Passive stretch (PS) protocol was applied until the PF muscle strength dropped 33.1% according to the hand-held dynamometric measurement. Seven additional age-matched able-bodies were compared with participants' to discriminate the influence of slow-walking. All participants underwent 3D gait analysis before and after the PS. Peak knee flexion angle, range of knee flexion between toe-off and peak knee flexion, total range of knee-flexion, and time of peak knee flexion in swing were selected to describe SKG pattern. RESULTS: After PS, the reduction of plantar flexor muscle strength (33.14%) caused knee flexion velocity drop at toe-off (p=0.008) and developed SKG pattern by decreasing peak knee flexion (p=0.0001), range of knee flexion in early swing (p=0.006), and total knee flexion range (p=0.002). These parameters were significantly correlated with decreased PF velocity at toe-off (p=0.015, p=0.0001, p=0.005, respectively). The time of peak knee flexion was not significantly different between before and after stretch conditions (p=0.130). CONCLUSIONS: These findings verified that plantar flexor weakness cause SKG pattern by completing three of SKG parameters. Any treatment protocol that weakens the plantar flexor muscle might impact the SKG pattern.
File Format	HTM / HTML
ISSN	09666362
Journal	Gait & Posture
Volume Number	46
e-ISSN	18792219
Language	English
Publisher	Elsevier
Publisher Date	2016-05-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Orthopedics
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Rehabilitation Biophysics Sports Science

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