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"Achilles tendon load"

Andrew Revak, Keith Diers, Thomas W Kernozek, Naghmeh Gheidi, Christina Olbrantz
CONTEXT: Achilles tendinopathies are common injuries during sport participation, although men are more prone to Achilles tendon injuries than women. Heel-raising and -lowering exercises are typically suggested for Achilles tendon rehabilitation. OBJECTIVE: To compare the estimated Achilles tendon loading variables and the ankle range of motion (ROM) using a musculoskeletal model during commonly performed heel-raising and -lowering exercises. DESIGN: Controlled laboratory study...
February 2017: Journal of Athletic Training
Thomas Kernozek, Naghmeh Gheidi, Robert Ragan
Tendon stress may be one of the important risk factors for running-related tendon injury. Several methods have been used to estimate Achilles tendon (AT) loading during a human performance such as inverse dynamics (ID) and inverse dynamics-based static optimisation (IDSO). Our purpose was to examine differences between ID and IDSO estimates of AT loading during running. Kinematic data were captured simultaneously with kinetic data. Imaging of the AT cross-sectional area was performed with ultrasound for 17 healthy runners (height: 170...
November 18, 2016: Journal of Sports Sciences
Thomas W Kernozek, Naghmeh Gheidi, Michael Lyght, Robert Ragan
No abstract text is available yet for this article.
May 2016: Medicine and Science in Sports and Exercise
Richard W Willy, Lisa Halsey, Andrew Hayek, Holly Johnson, John D Willson
Study Design Level 4, controlled laboratory study. Background Little is known regarding how the potential differences between treadmill and overground running may affect patellofemoral joint and Achilles tendon loading characteristics. Objectives To compare measures of loading of the patellofemoral joint and Achilles tendon across treadmill and overground running in healthy, uninjured runners. Methods Eighteen healthy runners ran at their self-selected speed on an instrumented treadmill and overground, while 3-D running mechanics were sampled...
August 2016: Journal of Orthopaedic and Sports Physical Therapy
Kelly N Salb, Daniel M Wido, Thomas E Stewart, Denis J DiAngelo
Ankle instantaneous axis of rotation (IAR) measurements represent a more complete parameter for characterizing joint motion. However, few studies have implemented this measurement to study normal, injured, or pathological foot ankle biomechanics. A novel testing protocol was developed to simulate aspects of in vivo foot ankle mechanics during mid-stance gait in a human cadaveric specimen. A lower leg was mounted in a robotic testing platform with the tibia upright and foot flat on the baseplate. Axial tibia loads (ATLs) were controlled as a function of a vertical ground reaction force (vGRF) set at half body weight (356 N) and a 50% vGRF (178 N) Achilles tendon load...
2016: Applied Bionics and Biomechanics
Mathias Wulf, Scott C Wearing, Sue L Hooper, Simon Bartold, Lloyd Reed, Torsten Brauner
STUDY DESIGN: Controlled laboratory study. BACKGROUND: Orthotic heel lifts are thought to lower tension in the Achilles tendon, but evidence for this effect is equivocal. OBJECTIVE: To investigate the effect of a 12-mm, in-shoe orthotic heel lift on Achilles tendon loading during shod walking using transmission-mode ultrasonography. METHODS: The propagation speed of ultrasound, which is governed by the elastic modulus and density of tendon and proportional to the tensile load to which it is exposed, was measured in the right Achilles tendon of 12 recreationally active men during shod treadmill walking at matched speeds (3...
February 2016: Journal of Orthopaedic and Sports Physical Therapy
Umur Aydogan, Blake Moore, Seth H Andrews, Evan P Roush, Allen R Kunselman, Gregory S Lewis
BACKGROUND: The optimal surgery for reducing pressure under the second metatarsal head to treat metatarsalgia is unknown. We tested our hypothesis that a proximal oblique dorsiflexion osteotomy of the second metatarsal would decrease second-metatarsal plantar pressures in a cadaver model with varying Achilles tendon tension. We also tested the plantar pressure effects of two popular techniques of distal oblique osteotomy. METHODS: Twelve fresh-frozen feet from six cadavers were randomly assigned to either the distal osteotomy group (a classic distal oblique osteotomy followed by a modified distal oblique osteotomy) or proximal metatarsal osteotomy group...
December 2, 2015: Journal of Bone and Joint Surgery. American Volume
Andrea M Y Wong, Sean I Docking, Jill L Cook, James E Gaida
BACKGROUND: Achilles tendon structure deteriorates 2-days after maximal loading in elite athletes. The load-response behaviour of tendons may be altered in type 1 diabetes mellitus (T1DM) as hyperglycaemia accelerates collagen cross-linking. This study compared Achilles tendon load-response in participants with T1DM and controls. METHODS: Achilles tendon structure was quantified at day-0, day-2 and day-4 after a 10 km run. Ultrasound tissue characterisation (UTC) measures tendon structural integrity by classifying pixels as echo-type I, II, III or IV...
2015: BMC Musculoskeletal Disorders
Robert A Weinert-Aplin, Anthony M J Bull, Alison H McGregor
Conservative treatments such as in-shoe orthotic heel wedges to treat musculoskeletal injuries are not new. However, weak evidence supporting their use in the management of Achilles tendonitis suggests the mechanism by which these heel wedges works remains poorly understood. It was the aim of this study to test the underlying hypothesis that heel wedges can reduce Achilles tendon load. A musculoskeletal modeling approach was used to quantify changes in lower limb mechanics when walking due to the introduction of 12-mm orthotic heel wedges...
April 2016: Journal of Applied Biomechanics
M Wulf, S C Wearing, S L Hooper, J E Smeathers, T Horstmann, T Brauner
Measurement of tendon loading patterns during gait is important for understanding the pathogenesis of tendon "overuse" injury. Given that the speed of propagation of ultrasound in tendon is proportional to the applied load, this study used a noninvasive ultrasonic transmission technique to measure axial ultrasonic velocity in the right Achilles tendon of 27 healthy adults (11 females and 16 males; age, 26 ± 9 years; height, 1.73 ± 0.07 m; weight, 70.6 ± 21.2 kg), walking at self-selected speed (1...
December 2015: Scandinavian Journal of Medicine & Science in Sports
Greenhalgh Andrew, Sinclair Jonathan
Recreational running is an activity with multiple reported health benefits for both sexes, however, chronic injuries caused by excessive and/or repetitive loading of the Achilles tendon are common. Males have been identified as being at an increased risk of suffering an injury to the Achilles tendon and as such, knowledge of differences in loading between the sexes may provide further information to better understand why this is the case. The aim of the current investigation was to determine whether gender differences in the Achilles tendon load exist in recreational runners...
December 9, 2014: Journal of Human Kinetics
Jonathan Sinclair, P J Taylor, S Atkins
Military recruits are known to be susceptible to Achilles tendon pathology. The British Army have introduced footwear models, the PT-03 (cross-trainer) and PT1000 (running shoes), in an attempt to reduce the incidence of injuries. The aim of the current investigation was to examine the Achilles tendon forces of the cross-trainer and running shoe in relation to conventional army boots. Ten male participants ran at 4.0 m/s in each footwear condition. Achilles tendon forces were obtained throughout the stance phase of running and compared using repeated-measures ANOVAs...
June 2015: Journal of the Royal Army Medical Corps
J Sinclair, J Isherwood, P J Taylor
BACKGROUND: Achilles tendon pathology is a frequently occurring musculoskeletal disorder in runners. Foot orthoses have been shown to reduce the symptoms of pain in runners but their mechanical effects are still not well understood. METHODS: This study aimed to examine differences in Achilles tendon load when running with and without orthotic intervention. Twelve male runners ran at 4.0 m·s(-1). Ankle joint moments and Achilles tendon forces were compared when running with and without orthotics...
September 2014: Clinical Biomechanics
Jonathan Sinclair
BACKGROUND: Recreational runners frequently suffer from chronic pathologies. The knee and ankle have been highlighted as common injury sites. Barefoot and barefoot inspired footwear have been cited as treatment modalities for running injuries as opposed to more conventional running shoes. This investigation examined knee and ankle loading in barefoot and barefoot inspired footwear in relation to conventional running shoes. METHOD: Thirty recreational male runners underwent 3D running analysis at 4...
April 2014: Clinical Biomechanics
Sobhan Sobhani, Johannes Zwerver, Edwin van den Heuvel, Klaas Postema, Rienk Dekker, Juha M Hijmans
OBJECTIVES: Relative rest and pain relief play an important role in the management of Achilles tendinopathy, and might be achieved by reducing the load on the Achilles tendon. Previous studies have provided evidence that rocker shoes are able to decrease the ankle internal plantar flexion moment in healthy runners during walking and running. Since plantar flexion moment is related to the Achilles tendon loading, rocker shoes might be considered in the conservative management of Achilles tendinopathy...
March 2015: Journal of Science and Medicine in Sport
Scott C Wearing, Lloyd Reed, Sue L Hooper, Simon Bartold, James E Smeathers, Torsten Brauner
BACKGROUND: Footwear remains a prime candidate for the prevention and rehabilitation of Achilles tendinopathy because it is thought to decrease tension in the tendon through elevation of the heel. However, evidence for this effect is equivocal. PURPOSE: This study used an acoustic transmission technique to investigate the effect of running shoes on Achilles tendon loading during barefoot and shod walking. METHODS: Acoustic velocity was measured in the Achilles tendon of 12 recreationally active males (age, 31 ± 9 yr; height, 1...
August 2014: Medicine and Science in Sports and Exercise
Jaymes D Granata, Gregory C Berlet, Rahul Ghotge, Yuan Li, Brian Kelly, Denis DiAngelo
BACKGROUND: Fusion of the talonavicular (TN) joint is an effective treatment for hindfoot pain and deformity. Nonunion in hindfoot fusion procedures is most common in the TN joint. The purpose of this study was to evaluate and compare the mechanical stability of 2 different forms of fixation for isolated fusion of the TN joint. MATERIALS AND METHODS: 13 fresh-frozen cadaver foot and ankles were procured and mounted vertically in a robotic biomechanical testing platform and tested before and after operative fixation; 7 specimens received 2 retrograde lag screws (2S), and 6 specimens received a locked compression plate with 1 retrograde lag screw (PS)...
February 2014: Foot & Ankle Specialist
Juha-Pekka Kulmala, Janne Avela, Kati Pasanen, Jari Parkkari
PURPOSE: Knee pain and Achilles tendinopathies are the most common complaints among runners. The differences in the running mechanics may play an important role in the pathogenesis of lower limb overuse injuries. However, the effect of a runner's foot strike pattern on the ankle and especially on the knee loading is poorly understood. The purpose of this study was to examine whether runners using a forefoot strike pattern exhibit a different lower limb loading profile than runners who use rearfoot strike pattern...
December 2013: Medicine and Science in Sports and Exercise
Thomas Almonroeder, John D Willson, Thomas W Kernozek
In this study we compared Achilles tendon loading parameters during barefoot running among females with different foot strike patterns using open-source computer muscle modeling software to provide dynamic simulations of running. Muscle forces of the gastrocnemius and soleus were estimated from experimental data collected in a motion capture laboratory during barefoot running for 11 runners utilizing a rearfoot strike (RFS) and 8 runners utilizing a non-RFS (NRFS) pattern. Our results show that peak Achilles tendon force occurred earlier in stance phase (p = 0...
August 2013: Annals of Biomedical Engineering
Christian Lersch, Alexander Grötsch, Bernhard Segesser, Jürgen Koebke, Gert-Peter Brüggemann, Wolfgang Potthast
BACKGROUND: Heterogeneous distribution of tendon strain is considered to contribute to the development of the Achilles tendon overuse injuries. Force distribution between the three portions of the triceps surae muscle and position of the calcaneus might affect the extent of strain differences within the Achilles tendon. Purpose of this study was to determine the effect of changes in force distribution within the triceps muscle and changes in calcaneus position on intratendinous strain distribution of the Achilles tendon...
November 2012: Clinical Biomechanics
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