Ankle-foot orthoses that restrict dorsiflexion improve walking in polio survivors with calf muscle weakness

H.E. Ploeger, S.A. Bus, M.A. Brehm, F. Nollet

Abstract

In polio survivors with calf muscle weakness, dorsiflexion-restricting ankle-foot orthoses (DR-AFOs) aim to improve gait in order to reduce walking-related problems such as instability or increased energy cost. However, evidence on the efficacy of DR-AFOs in polio survivors is lacking. We investigated the effect of DR-AFOs on gait biomechanics, walking energy cost, speed, and perceived waking ability in this patient group.

Sixteen polio survivors with calf muscle weakness underwent 3D-gait analyses to assess gait biomechanics when walking with DR-AFOs and with shoes only. Ambulant registration of gas-exchange during a 6-minute walk test determined walking energy cost, and comfortable gait speed was calculated from the walked distance during this test. Perceived walking ability was assessed using purposely-designed questionnaires.

Compared with shoes-only, walking with DR-AFOs significantly increased forward progression of the center of pressure (CoP) in mid-stance and it reduced ankle dorsiflexion and knee flexion in mid- and terminal stance (p  < 0.05). Furthermore, walking energy cost was lower (-7%, p = 0.052) and gait speed was higher (p = 0.005). Patients were significantly more satisfied, felt safer and less exhausted with the DR-AFO, compared to shoes-only (p  < 0.05). DR-AFO effects varied largely across patients. Patients who walked with limited forward CoP progression and persisting knee extension during the shoes-only condition seemed to have benefitted least from the DR-AFO.

In polio survivors with calf muscle weakness, DR-AFOs improved gait biomechanics, speed and perceived walking ability, compared to shoes-only. Effects may depend on the shoes-only gait pattern, therefore further study is needed to determine which patients benefit most from the DR-AFO.

Source: http://www.sciencedirect.com/science/article/pii/S0966636214005487

BAPO Conference & Exhibition 2015 - Save the date

Ottobock, Prosthetist x 2, Cleveland

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Buchanan Orthotics, Orthotist, Glasgow

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Personalized Orthoses as a Good Treatment Option for Charcot Neuro-osteoarthropathy of the Foot

Maria Luz González Fernández, Rosario Morales Lozano, Carmen Martínez Rincón, and David MartínezHernández

Background: We sought to assess the biomechanical characteristics of the feet of patients with Charcot neuro-osteoarthropathy and to determine reulceration rates before and after personalized conservative orthotic treatment.

Methods: A longitudinal prospective study was performed in 35 patients with Charcot's foot. Although some patients had a history of ulcers, at the study outset no patient had ulcers. All of the patients underwent biomechanical testing and a radiographic study. A radiophotopodogram was prepared by superimposing an imprint of the sole on a plantar radiograph. Based on the results of these tests, an orthopedic insole was prepared and therapeutic footwear prescribed for each foot. The following variables were compared between the Charcot and unaffected feet: previous ulcers and ulcer sites, reulcerations produced after treatment, type of foot (neuropathic/neuroischemic), ankle mobility, first-ray mobility, and relaxed calcaneal stance position. Treatment efficacy was determined by comparing ulcers presenting in patients in the year leading up to the study period and the year in which treatment was received.

Results: In a 1-year period, 70 feet received orthotic treatment, of which 41 were Charcot's feet. Ulceration rates before the study were 73.2% in feet with Charcot's and 31.0% in those without. After 1 year of wearing the customized orthoses, rates fell significantly to 9.8% in the Charcot feet and 0% in the feet without this condition.

Conclusions: Conservative customized orthotic treatment was effective at preventing ulcers and the complications that often lead these patients to surgery.

Source: http://www.japmaonline.org/doi/abs/10.7547/0003-0538-104.4.375

Paediatric Gait Analysis and Orthotic Management

This course explores a fresh approach to the observation and analysis of normal gait and standing, and the classification and management of gait disorders.

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Paediatric Gait Analysis

Ottobock - Orthotist - Portsmouth

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The Subtalar Joint Axis Palpation Technique Part 2: Reliability and Validity Results Using Cadaver Feet

Ken K. Van Alsenoy, Kristiaan D'Août, PhD, Evie E. Vereecke, Joris De Schepper, and Derek Santos

Background: Clinically locating the point of no rotation to determine the subtalar joint axis location by applying pressure on the plantar surface of the foot was described by Kirby in 1987 but was never validated. We sought to extend a previously validated mechanical model to cadaver feet and to examine the intratester and intertester reliability.

Methods: Four testers with different levels of experience determined the subtalar joint axis location and moved the subtalar joint through its range of motion, capturing the movement using kinematic analysis. The comparison of the spatial subtalar joint axis location as determined by palpation between and within testers determined the intertester and intratester reliability. The helical axis method was performed to validate the model.

Results: The intrarater reliability varied from a high of α = 0.96 to a low of α = 0.26 for the slope and was, in general, high (α = 0.78–0.95) for the intersection. The interrater reliability scored moderate to high, depending on the specific cadaver specimen. Concerning the exact location of the subtalar joint axis, no significant difference was found between the results determined by different testers and the helical axis method.

Conclusions: The palpation technique as part of the subtalar joint axis location and rotational equilibrium theory proposed by Kirby is a reliable and valid clinical tool. Experience in performing the palpation technique has a positive influence on the accuracy of the results. In the context of evidence-based practice, this technique could be a standard tool in the examination of patients with lower-limb–related pathologic disorders.

Source: http://www.japmaonline.org/doi/abs/10.7547/0003-0538-104.4.365

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