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Disease-specific gait deviations in pediatric patients with X-linked hypophosphatemia.

Abstract：

BACKGROUND:X-linked hypophosphatemia (XLH) represents the most common genetic form of rickets featuring profound hypophosphatemia with associated skeletal and non-skeletal manifestations. Early onset gait disturbances contribute strongly to the burden of disease. However, no study has comprehensively characterized naturally occurring gait deviations in pediatric patients with XLH. RESEARCH QUESTIONS:Can disease-specific gait deviations and potentially influencing factors be identified by gait analysis in non-surgically treated children with XLH? METHODS:Gait laboratory assessments of 12 pediatric patients with XLH without previous long bone surgery was retrospectively analyzed and compared to age-matched healthy controls. Radiologic and clinical parameters of XLH patients were correlated with kinematic gait variables and gait scores. RESULTS:Reduced external knee rotation and increased external hip orientation was ubiquitous in children with XLH. Increased lateral trunk lean, or "waddling gait", occurred in five children and was associated with varus knee deformities. Overall, children with XLH showed a reduced Gait Deviation Index (GDI) compared to controls. Radiologic and gait analysis revealed complex combined frontal and torsional deformity of the lower limbs as a common feature in XLH. Higher Body Mass Index (BMI) was associated with both lateral trunk lean and impaired GDI. SIGNIFICANCE:Gait analysis is feasible to quantify gait deviations and lower limb deformities in pediatric patients with XLH. Specific gait characteristics including internal knee rotation and external hip rotation are common among patients with XLH and contribute to impaired gait scores. Our data suggest the use of gait and deformity data assessment as outcome parameters in future observational and interventional studies. Standardized assessment might contribute to targeted treatments to improve life quality in XLH patients.

journal_name

Gait Posture

journal_title

Gait & posture

authors

Mindler GT,Kranzl A,Stauffer A,Haeusler G,Ganger R,Raimann A

doi

10.1016/j.gaitpost.2020.07.007

subject

Has Abstract

pub_date

2020-09-01 00:00:00

pages

78-84

eissn

0966-6362

issn

1879-2219

pii

S0966-6362(20)30240-X

journal_volume

pub_type

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Disease-specific gait deviations in pediatric patients with X-linked hypophosphatemia.