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Joint angle strength

Christian Baumgart, Wouter Welling, Matthias W Hoppe, Jürgen Freiwald, Alli Gokeler
Background: Strength deficits, muscle imbalances, and quadriceps inhibition are common after the surgical reconstruction of the anterior cruciate ligament (ACL), even after the patient's returned-to-sport. Typically, asymmetries between the operated and non-operated leg as well as the hamstring/quadriceps (HQ) ratio are calculated using maximum isokinetic torque values. Moreover, the knee flexion angles, which correspond to the measured torque values, were not considered. Therefore, the aim of the study was to evaluate the usage of an angle-specific approach for the analysis of isokinetic data in patients after an ACL-reconstruction...
2018: BMC Sports Science, Medicine and Rehabilitation
Yi-Ju Tsai, Chieh-Chie Chia, Pei-Yun Lee, Li-Chuan Lin, Yi-Liang Kuo
CONTEXT: Core control and strength are important for reducing the risk of lower extremity injury. Current evidence on the effect of core training in male adolescent athletes is limited, and other investigations into the effects of core training often emphasized core strength only. OBJECTIVE: To examine whether core training emphasizing both control and strength of the trunk and hip would improve joint kinematics during landing, sports performance, and lower extremity muscle strength in adolescent male volleyball athletes...
December 11, 2018: Journal of Sport Rehabilitation
Helmut Wegmann, Simon Heider, Michael Novak, Matthias Sperl, Tanja Kraus, Georg Singer, Holger Till
BACKGROUND: Only few reports have described the outcome of pediatric patients following radial head resection. Therefore, the aim of the present study was to assess clinical and radiologic outcome of patients with open physes following resection of the radial head. MATERIALS AND METHODS: Skeletally immature patients treated with resection of the radial head were included. Range of motion (ROM) of the elbow joint was compared with preoperative values. Grip strength, pronation and supination strength, and carrier angle were compared with the unaffected side...
November 27, 2018: Journal of Shoulder and Elbow Surgery
James Louis Nuzzo, Janet L Taylor, Simon C Gandevia
Muscle strength - the maximal force generating capacity of a muscle or group of muscles - is regularly assessed in physiological experiments and clinical trials. An understanding of the expected variation in strength and the factors that contribute to this variation is important when designing experiments, describing methodologies, interpreting results, and attempting to replicate methods of others and reproduce their findings. In this review (Cores of Reproducibility in Physiology), we report on the intra- and inter-rater reliability of tests of upper- and lower-limb muscle strength and voluntary activation in humans...
November 29, 2018: Journal of Applied Physiology
Alex Ireland, Fiona R Saunders, Stella G Muthuri, Anastasia V Pavlova, Rebecca J Hardy, Kathryn R Martin, Rebecca J Barr, Judith E Adams, Diana Kuh, Richard M Aspden, Jennifer S Gregory, Rachel Cooper
Bones' shapes and structures adapt to the muscle and reaction forces they experience during everyday movements. Onset of independent walking, at approximately 12 months, represents the first postnatal exposure of the lower limbs to the large forces associated with bipedal movements, and, accordingly, earlier walking is associated with greater bone strength. However, associations between early life loading and joint shape have not been explored. We therefore examined associations between walking age and hip shape at age 60-64y in 1423 individuals (740 women) from the MRC National Survey of Health and Development, a nationally-representative British birth cohort...
November 29, 2018: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
Eun Wook Chang, Samuel Johnson, Christine Pollard, Mark Hoffman, Marc Norcross
BACKGROUND: A functional test battery (FTB) has been proposed to determine return to full activity following anterior cruciate ligament reconstruction (ACLR). However, there is little biomechanical evidence of FTB usefulness. The purpose of this study was to compare knee joint landing and cutting biomechanics between ACLR patients who passed (ACLR-Pass), failed (ACLR-Fail), and healthy females (Healthy) before and after exercise. METHODS: Thirty females were included: 10 ACLR-Pass, eight ACLR-Fail and 12 Healthy...
October 25, 2018: Knee
Dominique Marion, Diego F Gauto, Isabel Ayala, Karine Giandoreggio-Barranco, Paul Schanda
Studying protein dynamics on microsecond-to-millisecond time scales can provide important insight into protein function. In magic-angle-spinning (MAS) NMR, microsecond dynamics can be visualized by R1rho rotating-frame relaxation dispersion experiments in different regimes of radio-frequency field strengths: at low RF field strength, isotropic-chemical-shift fluctuation leads to "Bloch-McConnell-type" relaxation dispersion, while when the RF field approaches resonance conditions with the MAS frequency ("Near-Rotary-Resonance Relaxation Dispersion", NERRD), bond angle fluctuations become visible through the dipolar/CSA reorientation...
November 16, 2018: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Deniz Akar, Cenk Köroğlu, Serkan Erkus, Ali Turgut, Önder Kalenderer
Introduction Distal radius fractures are the most frequent fractures seen in pediatric population and usually treated with closed reduction and casting. However, there is a risk of reduction loss and/or angulations in distal radial metaphyseal fractures. The purpose of this study is to evaluate the radiological and functional results of pediatric patients with distal radius metaphyseal fractures in which excessive displacement and/or angulations were accepted and to question upper acceptable limits in light of current literature...
September 5, 2018: Curēus
Yasuhiro Yuasa, Toshiyuki Kurihara, Tadao Isaka
This study aimed to investigate the relationship between toe muscular strength and the ability to change direction in athletes. Seventeen collegiate American-football players participated in the study (age 19.9 ± 0.9 years, competition experience 7.3 ± 1.7 years). Two types of measurements were performed to evaluate toe muscular strength: toe flexor strength with the metatarsophalangeal joint in the planter flexed position and toe-pushing force with the metatarsophalangeal joint in the dorsiflexed position...
September 2018: Journal of Human Kinetics
Diego F Rincon Cardozo, Wynston J Alvarez Martinez, Jhon F Castañeda Lopez, Fredy A Angarita Maldonado, Juliana A Rojas Neira, Álvaro A Kafury Goeta
BACKGROUND: Pellegrini's surgical technique is the most useful for thumb carpometacarpal joint osteoarthritis. The purpose of this paper is to describe the technique of a modified version using a bone block in the tunnel through which the flexor carpi radialis tendon is passed (BBTI). METHODS: Case series of patients diagnosed with osteoarthritis of the thumb carpometacarpal joint, in stage II or higher based on Eaton's classification, that were intervened using the BBTI technique for a 2-year period...
December 2018: Journal of Hand Surgery Asian-Pacific Volume
Annemie Smeets, Bart Malfait, Bart Dingenen, Mark A Robinson, Jos Vanrenterghem, Koen Peers, Stefaan Nijs, Styn Vereecken, Filip Staes, Sabine Verschueren
BACKGROUND: There is limited evidence on neuromuscular risk factors for anterior cruciate ligament (ACL) injuries, with most work mainly focusing on hamstrings and quadriceps muscle strength. This prospective pilot study explored if neuromuscular activation patterns of the quadriceps and hamstrings during a drop vertical jump influence ACL injury risk. METHODS: Forty-six female athletes performed a drop vertical jump at baseline. Injuries were monitored throughout a one-year follow-up...
November 8, 2018: Knee
Tyler Bahr, Kathryn Allred, Devin Martinez, Damian Rodriguez, Paul Winterton
BACKGROUND AND PURPOSE: Existing research suggests that both massage and essential oils may have analgesic and anti-inflammatory benefits. We investigate the benefits of the AromaTouch Hand Technique® (ATHT), a procedure that combines a moderate pressure touch with the application of essential oils to the hand, in individuals with hand arthritis. METHODS AND MATERIALS: Thirty-six participants with rheumatoid arthritis, osteoarthritis, and/or chronic inflammation received ATHTs with either a 50/50 preparation of Deep Blue® and Copaiba oil or a coconut oil placebo twice daily for 5 consecutive days...
November 2018: Complementary Therapies in Clinical Practice
Christopher D Johnston, Jonathan S Goodwin, Jeffery T Spang, Brian Pietrosimone, J Troy Blackburn
Anterior cruciate ligament reconstruction (ACLR) restores joint stability following ACL injury but does not attenuate the heightened risk of developing knee osteoarthritis. Additionally, patellar tendon (PT) grafts incur a greater risk of osteoarthritis compared to hamstring grafts (HT). Aberrant gait biomechanics, including greater loading rates (i.e. impulsive loading), are linked to the development of knee osteoarthritis. However, the role of graft selection on walking gait biomechanics linked to osteoarthritis is poorly understood, thus the purpose of this study was to compare walking gait biomechanics between individuals with HT and PT grafts...
October 25, 2018: Journal of Biomechanics
Xiaoguang Zhao, Takehiko Tsujimoto, Bokun Kim, Yasutomi Katayama, Kiyoji Tanaka
The human foot plays an important role in supporting body weight, maintaining postural balance, and absorbing ground reaction forces. Although many studies have indicated that a causal relationship exists between foot structure and alterations in lower extremity kinematics, there is little evidence regarding the possible association of foot structure with strength of muscles that move the ankle and physical performance. A total of 67 adult men with a mean age of 51.19 ± 8.82 years participated in this study...
November 2018: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
Kara A Hecker, Lara A Carlson, Michael A Lawrence
Hecker, KA, Carlson, LA, and Lawrence, MA. Effects of the safety squat bar on trunk and lower-body mechanics during a back squat. J Strength Cond Res XX(X): 000-000, 2018-The purpose of this study was to determine whether the safety squat bar (SSB) alters the mechanics and muscle activity of a back squat compared with a standard barbell (ST). Motion and muscle activation of the trunk and lower extremity were measured while 12 competitive powerlifters (8 males, 4 females, age 31.5 ± 6.3 years, body mass 88...
October 22, 2018: Journal of Strength and Conditioning Research
So Hyun Park, Yun-Seob Lee, Song Hee Cheon, Min-Sik Yong, Daehwan Lee, Eun-Ju Lee
BACKGROUND: Many practitioners recommend step-up and step-down exercises to increase muscle strength in the lower extremities. However, decreased stability of the hip joint and imbalanced muscle activities can alter limb biomechanics during these movements. OBJECTIVE: This study investigated muscle imbalance between the medial and lateral muscle components and between the proximal and distal muscle components by expressing the proportions of muscle activation in the step-up and step-down positions...
September 29, 2018: Journal of Back and Musculoskeletal Rehabilitation
Chun-Hui Tang, Gao-Wen Yao, Lin Wang, Wei Luo
OBJECTIVE: To evaluate the feasibility of internal and external fixation after open reduction combined with suture anchors to repair the intercarpal ligaments for the treatment of perilunate injury, and to explore its operative techniques and therapeutic efficacy. METHODS: From September 2012 to September 2016, 11 patients with perilunate injury were surgically treated with Kirschner wires in intercarpal articulations, 3.0 mm cannulated screws for scaphoid fracture, absorbable anchor for intercarpal ligament repair, together with fixators at intercarpal joints, among whom 6 suffered from perilunate dislocations and 5 from trans-scaphoid fracture dislocations...
September 25, 2018: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
George M Pamboris, Marika Noorkoiv, Vasilios Baltzopoulos, Amir A Mohagheghi
The acute effects of two dynamic stretching (DS) protocols on changes in the ankle range of motion (RoM), neuromechanical, and sensorimotor properties of the plantarflexor muscle group were examined. Eighteen participants received slow (SDS) or fast dynamic stretching (FDS) on two separate days. Outcome measures were assessed pre- and 2 minutes post-interventions, and included maximum dorsiflexion angle, maximum isometric torque at neutral ankle position, maximum concentric and eccentric torques, force matching capacity, joint position sense and medial gastrocnemius muscle and tendon strain...
October 16, 2018: Scandinavian Journal of Medicine & Science in Sports
Özge Çınar-Medeni, Gulcan Harput, Gul Baltaci
The purposes of this study were to analyse (a) if "angle-specific" (AS) flexor and extensor torques were different between ACL-reconstructed and uninvolved limbs, (b) the difference in peak torque occurrence angles for concentric and eccentric knee flexor and extensor torques between involved and uninvolved limbs and (c) if AS concentric and eccentric knee flexor and extensor torques are determinants of performance in the "single-leg hop test" (SLHT) and "vertical jump and reach test" (VJRT) in ACL-reconstructed legs...
October 13, 2018: Journal of Sports Sciences
Yoichi Sugiyama, Kiyohito Naito, Hiroyuki Obata, Mayuko Kinoshita, Kenji Goto, Nana Nagura, Yoshiyuki Iwase, Kazuo Kaneko
Background: In this study, we retrospectively surveyed the presence or absence of pisiform subluxation in surgically treated distal radius fractures (DRF) cases. In addition, we investigated whether or not the postoperative short-term treatment outcome differs due to the presence of pisiform subluxation. Materials and methods: The subjects were 134 DRF patients treated with volar locking plate fixation (53 males and 81 females, mean age: 64 years old). The pisotriquetral joint was observed on a preoperative CT to investigate the presence or absence of pisiform subluxation according to the criteria reported by Vasilas...
November 2018: Annals of Medicine and Surgery
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