15 research outputs found
Expert nursesâ use of implicit memory in the care of patients with Alzheimer's disease
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/73899/1/j.1365-2648.2006.03864.x.pd
Distal Radius Volar Locking Plate Design and Associated Vulnerability of the Flexor Pollicis Longus
Do bone geometric properties of the proximal femoral diaphysis reflect loading history, muscle properties, or body dimensions?
Abstract
Objectives: The aim of this study was to investigate activityâinduced effects from bone geometric properties of the proximal femur in athletic vs nonathletic healthy females by statistically controlling for variation in body size, lower limb isometric, and dynamic muscle strength, and crossâsectional area of Musculus gluteus maximus.
Methods: The material consists of hip and proximal thigh magnetic resonance images of Finnish female athletes (Nâ=â91) engaged in either high jump, triple jump, soccer, squash, powerlifting, endurance running or swimming, and a group of physically active nonathletic women (Nâ=â20). Crossâsectional bone geometric properties were calculated for the lesser trochanter, subâtrochanter, and midâshaft of the femur regions. Bone geometric properties were analyzed using a general linear model that included body size, muscle size, and muscle strength as covariates.
Results: Body size and isometric muscle strength were positively associated with bone geometric properties at all three crossâsectional levels of the femur, while muscle size was positively associated with bone properties only at the femur midâshaft. When athletes were compared to nonathletic females, triple jump, soccer, and squash resulted in greater values in all studied crossâsections; high jump and endurance running resulted in greater values at the femoral midâshaft crossâsection; and swimming resulted in lower values at subâtrochanter and femur midâshaft crossâsections.
Conclusions: Activity effects from ground impact loading were associated with higher bone geometric values, especially at the femur midâshaft, but also at lesser and subâtrochanter crossâsections. Bone geometric properties along the femur can be used to assess the mechanical stimuli experienced, where ground impact loading seems to be more important than muscle loading