Sudarshan Dayanidhi

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Hyperkinetic movements are unwanted or excess movements that are frequently seen in children with neurologic disorders. They are an important clinical finding with significant implications for diagnosis and treatment. However, the lack of agreement on standard terminology and definitions interferes with clinical treatment and research. We describe(More)
BACKGROUND Appropriate motion of the scapula is important for dynamic positioning of the glenoid during humeral elevation. A number of studies have described the typical scapular kinematics during humeral elevation in adults. However, children and adults may have differences in scapulothoracic musculature and scapular osteology. To our knowledge, no study(More)
BACKGROUND The ability to dynamically control fingertip force vector magnitude and direction is critical for dexterous manipulation. We quantified the dynamic control of fingertip forces to examine how dexterous manipulation declines with age. METHODS The strength-dexterity (SD) test measures fingertip forces during compression of a slender spring prone(More)
While it is clear that the development of dexterous manipulation in children exhibits dramatic improvements over an extended period, it is difficult to separate musculoskeletal from neural contributors to these important functional gains. This is in part due to the inability of current methods to disambiguate improvements in hand strength from gains in(More)
Understanding the mapping between individual outcome measures and the latent functional domains of interest is critical to a quantitative evaluation and rehabilitation of hand function. We examined whether and how the associations among six hand-specific outcome measures reveal latent functional domains in elderly individuals. We asked 66 healthy older(More)
Developmental improvements in dynamic manipulation abilities are typically attributed to neural maturation, such as myelination of corticospinal pathways, neuronal pruning, and synaptogenesis. However the contributions from changes in the peripheral motor system are less well understood. Here we investigated whether there are developmental changes in muscle(More)
BACKGROUND Shoulder movement patterns differ between limbs of children with unilateral brachial plexus birth palsy. To better understand the interlimb differences we examined the glenohumeral and scapulothoracic joint contributions to arm elevation. METHODS Sixteen children with brachial plexus birth palsy, 4-12 years of age participated. Shoulder 3D(More)
STUDY DESIGN Retrospective Cohort INTRODUCTION Important outcomes of polliciation to treat thumb hypoplasia/aplasia include strength, function, dexterity, and quality of life. PURPOSE OF THE STUDY To evaluate outcomes and examine predictors of outcome after early childhood pollicization. METHODS 8 children (10 hands) were evaluated 3-15 years after(More)
Satellite cells (SCs) are the muscle stem cells responsible for longitudinal and cross-sectional postnatal growth and repair after injury and which provide new myonuclei when needed. We review their morphology and contribution to development and their role in sarcomere and myonuclear addition. SCs, similar to other tissue stem cells, cycle through different(More)
Dexterity after finger pollicization (reconstruction to thumb) is critical to functional outcomes. While most tests of hand function evaluate a combination of strength, coordination, and motor control, the Strength-Dexterity (S-D) paradigm focuses on the dynamic control of fingertip forces. We evaluated 10 pollicized and 5 non-pollicized hands from 8(More)