Joint Reaction Forces at the Hip Joint during Dynamic Manipulation of the Femur

2008 ◽  
Author(s):  
Thomas R. Gardner ◽  
Katerina Fishman ◽  
Alaina Johns ◽  
Evan K. Johnson
Keyword(s):  
Hip Joint ◽  
Joint Reaction Forces ◽  
Reaction Forces ◽  
Joint Reaction ◽  
Dynamic Manipulation

Quantifying Force Magnitude and Loading Rate from Drop Landings That Induce Osteogenesis

2001 ◽  
Vol 17 (2) ◽  
pp. 142-152 ◽  
Author(s):  
Jeremy J. Bauer ◽  
Robyn K. Fuchs ◽  
Gerald A. Smith ◽  
Christine M. Snow
Keyword(s):  
Hip Joint ◽  
Inverse Dynamics ◽  
Initial Contact ◽  
Ground Reaction Forces ◽  
Loading Rates ◽  
Impact Peak ◽  
Joint Reaction Forces ◽  
Reaction Forces ◽  
Drop Landings ◽  
Joint Reaction

Drop landings increase hip bone mass in children. However, force characteristics from these landings have not been studied. We evaluated ground and hip joint reaction forces, average loading rates, and changes across multiple trials from drop landings associated with osteogenesis in children. Thirteen prepubescent children who had previously participated in a bone loading program volunteered for testing. They performed 100 drop landings onto a force plate. Ground reaction forces (GRF) and two-dimensional kinematic data were recorded. Hip joint reaction forces were calculated using inverse dynamics. Maximum GRF were 8.5 ± 2.2 body weight (BW). At initial contact, GRF were 5.6 ± 1.4 BW while hip joint reactions were 4.7 ± 1.4 BW. Average loading rates for GRF were 472 ± 168 BW/s. Ground reaction forces did not change significantly across trials for the group. However, 5 individuals showed changes in max GRF across trials. Our data indicate that GRF are attenuated 19% to the hip at the first impact peak and 49% at the second impact peak. Given the skeletal response from the drop landing protocol and our analysis of the associated force magnitudes and average loading rates, we now have a data point on the response surface for future study of various combinations of force, rate, and number of load repetitions for increasing bone in children.

Dynamic Force Response of Human Legs due to Vertical Jumps

2011 ◽  
Author(s):  
Kinjal Prajapati ◽  
Fred Barez ◽  
James Kao ◽  
David Wagner
Keyword(s):  
Knee Joint ◽  
Hip Joint ◽  
Vertical Jump ◽  
Injury Mechanism ◽  
Ankle Injuries ◽  
Musculoskeletal Simulation ◽  
Joint Reaction Forces ◽  
Reaction Forces ◽  
Vertical Jumps ◽  
Joint Reaction

Jumping is a natural exertion that occurs during a variety of human activities including playing sports, working, skateboarding, dancing, escaping from hazardous events, rescue activities, and many others. During jumping, the ankles in particular are expected to support the entire body weight of the jumper and that may lead to ankle injuries. Each year hundreds of patients are treated for ankle sprains/strains with ankle fractures as one of the most common injuries treated by orthopedists and podiatrists. The knee joint is also considered the most-often injured joint in the entire human body. Although the general anatomy of the lower extremities is fairly well understood, an understanding of the injury mechanism during these jumping tasks is not well understood. The aim of this study is to determine the reaction forces exerted on legs and joints due to vertical jumps, through musculoskeletal simulation and experimental studies to better understand the dynamic jump process and the injury mechanism. The joint reaction forces and moments exerted on the ankle, knee and hip joint during takeoff and extreme squat landing of a vertical jump were determined through the application of musculoskeletal simulation. It is concluded that during extreme squat landing of a vertical jump, joint reaction forces and moments were highest in proximal/distal and anteroposterior direction may cause most likely injury to the hip joint ligaments, ankle fracture and knee joint, respectively.

Subject specific hip geometry after THP influences hip joint reaction forces during gait

2006 ◽  
Vol 24 ◽  
pp. S62-S63
Author(s):  
G. Lenaerts ◽  
I. Jonkers ◽  
G. Van der Perre ◽  
A. Spaepen
Keyword(s):  
Hip Joint ◽  
Hip Geometry ◽  
Subject Specific ◽  
Joint Reaction Forces ◽  
Reaction Forces ◽  
Joint Reaction

Musculoskeletal Modeling of Acetabular Dysplasia-Kinematics, Muscle and Joint Reaction Forces

2010 ◽  
Author(s):  
Michael D. Harris ◽  
Ryan S. Davis ◽  
Bruce A. MacWilliams ◽  
Christopher L. Peters ◽  
Andrew E. Anderson
Keyword(s):  
Hip Joint ◽  
Acetabular Dysplasia ◽  
Joint Kinematics ◽  
Developmental Dysplasia ◽  
Musculoskeletal Modeling ◽  
Muscle Forces ◽  
Joint Force ◽  
Joint Reaction Forces ◽  
Reaction Forces ◽  
Joint Reaction

Anatomical pathologies of the hip, such as developmental dysplasia are a common cause of hip pain in the young adult. While it is generally accepted that cartilaginous lesions and tears to the acetabular labrum initiate pain, muscle compensation/weakness may also contribute, especially for patients who do not have evidence of soft-tissue damage. Musculoskeletal models provide estimates of muscle forces as well as the equivalent force that acts upon the joint. Force data can then be compared to any observed differences in joint kinematics, thereby improving the interpretability of data from traditional gait studies. While a few studies have reported alterations in hip joint kinematics due to acetabular dysplasia, to our knowledge, muscle force differences have not been estimated [1, 2]. The purpose of this study was to couple traditional gait analysis with musculoskeletal modeling to compare hip joint kinematics, muscle forces, and joint reaction forces between subjects with acetabular dysplasia and normal controls.

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