The Experts below are selected from a list of 1518 Experts worldwide ranked by ideXlab platform
Tomoyuki Saito - One of the best experts on this subject based on the ideXlab platform.
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Hip adductor muscle strength in patients with varus deformed knee
Clinical Orthopaedics and Related Research, 2001Co-Authors: Hiroshi Yamada, Tomihisa Koshino, Naotaka Sakai, Tomoyuki SaitoAbstract:The isometric muscle strength of the muscles around 49 medial compartmental osteoarthritic knees of 32 women was measured quantitatively using a Musculater GT-50 (osteoarthritis group). The patients pushed up a pad containing an electrical sensor and values were compared with those obtained from the nonaffected knees of subjects (control group). The mean age of the patients in the osteoarthritis group was 62.3 years (range, 43-78 years). The control group consisted of 13 women (13 knees) with a mean age of 60.5 years (range, 49-73 years). In the osteoarthritis group, the medial joint space was preserved in 17 knees (Grade 1), 23 knees had narrowing of the joint space (Grade 2), and nine knees showed joint space obliteration (Grade 3). Quadriceps strength was significantly weaker in Grade 2 knees than in Grade 0 knees; however, there was no significant difference in quadriceps to hamstrings ratio between each grade. The Hip Adductors to hamstrings ratio was significantly greater in Grade 2 knees than in Grade 0 knees, and was greater in Grade 3 knees than in Grade 0, Grade 1, and Grade 2 knees. The findings suggested that in patients with medial compartmental osteoarthritis of the knee, the Hip adductor muscles may become strengthened to decrease varus deformity of the limb.
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Hip adductor muscle strength in patients with varus deformed knee
Clinical orthopaedics and related research, 2001Co-Authors: Hiroshi Yamada, Tomihisa Koshino, Naotaka Sakai, Tomoyuki SaitoAbstract:The isometric muscle strength of the muscles around 49 medial compartmental osteoarthritic knees of 32 women was measured quantitatively using a Musculater GT-50 (osteoarthritis group). The patients pushed up a pad containing an electrical sensor and values were compared with those obtained from the nonaffected knees of subjects (control group). The mean age of the patients in the osteoarthritis group was 62.3 years (range, 43-78 years). The control group consisted of 13 women (13 knees) with a mean age of 60.5 years (range, 49-73 years). In the osteoarthritis group, the medial joint space was preserved in 17 knees (Grade A), 23 knees had narrowing of the joint space (Grade 2), and nine knees showed joint space obliteration (Grade 3). Quadriceps strength was significantly weaker in Grade 2 knees than in Grade 0 knees; however, there was no significant difference in quadriceps to hamstrings ratio between each grade. The Hip Adductors to hamstrings ratio was significantly greater in Grade 2 knees than in Grade 0 knees, and was greater in Grade 3 knees than in Grade 0, Grade 1, and Grade 2 knees. The findings suggested that in patients with medial compartmental osteoarthritis of the knee, the Hip adductor muscles may become strengthened to decrease varus decrease varus deformity of the limb.
Per Holmich - One of the best experts on this subject based on the ideXlab platform.
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Clinical recovery of two Hip adductor longus ruptures: a case-report of a soccer player
BMC research notes, 2013Co-Authors: Kristian Thorborg, Jesper Petersen, Michael Bachmann Nielsen, Per HolmichAbstract:Non-operative treatment of acute Hip adductor longus ruptures in athletes has been described in the literature. However, very limited information concerning the recovery of this type of injury exists. This case represented a unique possibility to study the recovery of two acute adductor longus ruptures, using novel, reliable and validated assessment methods. A 22-year old male soccer player (Caucasian) sustained two subsequent acute adductor longus ruptures, one in each leg. The injuries occurred 10 months apart, and were treated non-surgically in both situations. He was evaluated using Hip-strength assessments, self-report and ultrasonography until complete muscle-strength recovery of the Hip Adductors had occurred. The player was able to participate in a full soccer training session without experiencing pain 15 weeks after the first rupture, and 12 weeks after the second rupture. Full Hip adductor muscle-strength recovery was obtained 52 weeks after the first rupture and 10 weeks after the second rupture. The adductor longus injuries, as verified by initial ultrasonography (10 days post-injury), showed evidence of a complete tendon rupture in both cases, with an almost identical imaging appearance. It was only at 6 and 10 weeks ultrasonographic follow-up that the first rupture was found to include a larger anatomical area than the second rupture. From this case we can conclude that two apparently similar Hip adductor longus ruptures, verified by initial ultrasonography (10 days post-injury), can have very different Hip adductor strength recovery times. Assessment of adductor strength recovery may therefore in the future be a useful and important additional measure for determining when soccer players with Hip adductor longus ruptures can return safely to play.
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eccentric Hip adduction and abduction strength in elite soccer players and matched controls a cross sectional study
British Journal of Sports Medicine, 2011Co-Authors: Kristian Thorborg, Jesper Petersen, Christian Couppe, S P Magnusson, Per HolmichAbstract:Background Eccentric Hip adduction and abduction strength plays an important role in the treatment and prevention of groin injuries in soccer players. Lower extremity strength deficits of less than 10% on the injured side, compared to the uninjured side, have been suggested as the clinical milestone before returning to sports following injury. Objective To examine whether a side-to-side eccentric Hip adduction or abduction strength symmetry can be assumed in non-injured soccer players and matched controls. Material and Methods Nine elite soccer players 19.4 (1.5) years and nine recreational athletes 19.5 (2.0) years matched for sex, height and weight were included. Eccentric Hip adduction and abduction strength of the dominant and non-dominant leg was tested for all the participants using an eccentric break test with a handheld dynamometer. Results The dominant leg was 14% stronger than the non-dominant leg for Hip adduction in the soccer players (p Conclusion Eccentric Hip adduction strength was greater in the dominant leg than in the non-dominant leg in soccer players, but not in matched controls. Eccentric Hip abduction strength was greater in soccer players than matched controls, but soccer does not seem to induce a similar eccentric strength adaptation in the Hip Adductors.
Yasin Y Dhaher - One of the best experts on this subject based on the ideXlab platform.
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corticospinal responses of quadriceps are abnormally coupled with Hip Adductors in chronic stroke survivors
Experimental Neurology, 2012Co-Authors: Chandramouli Krishnan, Yasin Y DhaherAbstract:Abstract Stroke survivors often lose the ability to move their joints independently, which results in abnormal movement patterns when attempting to perform an isolated motion. For instance, many stroke subjects exhibit unwanted secondary knee extension movement when performing Hip adduction. This study aimed at characterizing whether the neural substrates mediating abnormal activation patterns after stroke are of cortical origin. We developed a novel transcranial magnetic stimulation protocol to evaluate the extent of abnormal across-joint coupling of corticospinal responses in chronic stroke survivors. In stroke survivors, we found that the magnitude of motor evoked potentials of the vastus lateralis and vastus medialis during isometric Hip adduction were significantly higher than those recorded during knee extension at similar background activity ( P = 0.03 and P = 0.01). Moreover, motor evoked potential coupling ratios of the quadriceps muscles were significantly different than those observed in healthy controls ( P = 0.005 to P = 0.037). No differences in motor evoked potential coupling ratios were observed between the younger and older adults ( P = 0.474 to P = 0.919). These findings provide evidence for the first time that stroke subjects exhibit abnormal excitability of the quadriceps muscle corticospinal neurons when performing isometric Hip adduction. Importantly, the abnormal corticospinal responses observed in stroke subjects were not mediated by aging. The results of this study provide new insights into the mechanisms underlying loss of independent joint control after stroke and have meaningful implications for post-stroke interventions. Moreover, the proposed ‘motor evoked potential coupling ratio’ may serve as an effective probe to evaluate cortical contributions to abnormal muscle synergy after stroke.
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Stretch reflex coupling between the Hip and knee: implications for impaired gait following stroke
Experimental Brain Research, 2008Co-Authors: James M. Finley, Eric J. Perreault, Yasin Y DhaherAbstract:Individuals with hemiparetic stroke often exhibit an abnormal coupling between the frontal plane of the Hip and saggital plane of the knee during gait. The purpose of this study was to determine if stretch sensitive reflexes, which are known to be altered following stroke, exhibit similar coupling between the muscles of the Hip and knee in the post-stroke population. Eighteen subjects were recruited for this study including ten with hemiparesis resulting from stroke and eight unimpaired, age-matched controls. A servomotor was used to apply ramp and hold perturbations to both the Hip and knee joints in separate sessions and electromyographic activity was recorded in eight muscles of the lower limb. Hip abduction perturbations elicited abnormal activation in rectus femoris (RF) in seven of ten stroke subjects with amplitudes ranging from 3.2 to 12.5% of the maximum voluntary contraction (MVC). Only two of eight control subjects exhibited any activity in RF and these responses were only 2.1 and 2.7% of MVC. To determine if the responses in the stroke group were a result of muscle stretch, a musculoskeletal model was used to simulate the experimental abduction perturbations and estimate muscle length changes. The simulation revealed that RF should be shortened by the perturbations and this suggests that the response was not likely due to direct stretch. Moreover, knee flexion perturbations elicited responses in the Hip Adductors (AL) with a mean amplitude of 5.1 ± 3.8% of MVC across all stroke subjects while no significant responses were recorded in controls. The presence of a reciprocal, reflex-mediated coupling between RF and AL following stroke suggests that changes in the excitability of spinal networks may contribute to the development of abnormal inter-joint coordination patterns observed during hemiparetic gait.
Hiroshi Yamada - One of the best experts on this subject based on the ideXlab platform.
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Hip adductor muscle strength in patients with varus deformed knee
Clinical Orthopaedics and Related Research, 2001Co-Authors: Hiroshi Yamada, Tomihisa Koshino, Naotaka Sakai, Tomoyuki SaitoAbstract:The isometric muscle strength of the muscles around 49 medial compartmental osteoarthritic knees of 32 women was measured quantitatively using a Musculater GT-50 (osteoarthritis group). The patients pushed up a pad containing an electrical sensor and values were compared with those obtained from the nonaffected knees of subjects (control group). The mean age of the patients in the osteoarthritis group was 62.3 years (range, 43-78 years). The control group consisted of 13 women (13 knees) with a mean age of 60.5 years (range, 49-73 years). In the osteoarthritis group, the medial joint space was preserved in 17 knees (Grade 1), 23 knees had narrowing of the joint space (Grade 2), and nine knees showed joint space obliteration (Grade 3). Quadriceps strength was significantly weaker in Grade 2 knees than in Grade 0 knees; however, there was no significant difference in quadriceps to hamstrings ratio between each grade. The Hip Adductors to hamstrings ratio was significantly greater in Grade 2 knees than in Grade 0 knees, and was greater in Grade 3 knees than in Grade 0, Grade 1, and Grade 2 knees. The findings suggested that in patients with medial compartmental osteoarthritis of the knee, the Hip adductor muscles may become strengthened to decrease varus deformity of the limb.
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Hip adductor muscle strength in patients with varus deformed knee
Clinical orthopaedics and related research, 2001Co-Authors: Hiroshi Yamada, Tomihisa Koshino, Naotaka Sakai, Tomoyuki SaitoAbstract:The isometric muscle strength of the muscles around 49 medial compartmental osteoarthritic knees of 32 women was measured quantitatively using a Musculater GT-50 (osteoarthritis group). The patients pushed up a pad containing an electrical sensor and values were compared with those obtained from the nonaffected knees of subjects (control group). The mean age of the patients in the osteoarthritis group was 62.3 years (range, 43-78 years). The control group consisted of 13 women (13 knees) with a mean age of 60.5 years (range, 49-73 years). In the osteoarthritis group, the medial joint space was preserved in 17 knees (Grade A), 23 knees had narrowing of the joint space (Grade 2), and nine knees showed joint space obliteration (Grade 3). Quadriceps strength was significantly weaker in Grade 2 knees than in Grade 0 knees; however, there was no significant difference in quadriceps to hamstrings ratio between each grade. The Hip Adductors to hamstrings ratio was significantly greater in Grade 2 knees than in Grade 0 knees, and was greater in Grade 3 knees than in Grade 0, Grade 1, and Grade 2 knees. The findings suggested that in patients with medial compartmental osteoarthritis of the knee, the Hip adductor muscles may become strengthened to decrease varus decrease varus deformity of the limb.
Kristian Thorborg - One of the best experts on this subject based on the ideXlab platform.
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Clinical recovery of two Hip adductor longus ruptures: a case-report of a soccer player
BMC research notes, 2013Co-Authors: Kristian Thorborg, Jesper Petersen, Michael Bachmann Nielsen, Per HolmichAbstract:Non-operative treatment of acute Hip adductor longus ruptures in athletes has been described in the literature. However, very limited information concerning the recovery of this type of injury exists. This case represented a unique possibility to study the recovery of two acute adductor longus ruptures, using novel, reliable and validated assessment methods. A 22-year old male soccer player (Caucasian) sustained two subsequent acute adductor longus ruptures, one in each leg. The injuries occurred 10 months apart, and were treated non-surgically in both situations. He was evaluated using Hip-strength assessments, self-report and ultrasonography until complete muscle-strength recovery of the Hip Adductors had occurred. The player was able to participate in a full soccer training session without experiencing pain 15 weeks after the first rupture, and 12 weeks after the second rupture. Full Hip adductor muscle-strength recovery was obtained 52 weeks after the first rupture and 10 weeks after the second rupture. The adductor longus injuries, as verified by initial ultrasonography (10 days post-injury), showed evidence of a complete tendon rupture in both cases, with an almost identical imaging appearance. It was only at 6 and 10 weeks ultrasonographic follow-up that the first rupture was found to include a larger anatomical area than the second rupture. From this case we can conclude that two apparently similar Hip adductor longus ruptures, verified by initial ultrasonography (10 days post-injury), can have very different Hip adductor strength recovery times. Assessment of adductor strength recovery may therefore in the future be a useful and important additional measure for determining when soccer players with Hip adductor longus ruptures can return safely to play.
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eccentric Hip adduction and abduction strength in elite soccer players and matched controls a cross sectional study
British Journal of Sports Medicine, 2011Co-Authors: Kristian Thorborg, Jesper Petersen, Christian Couppe, S P Magnusson, Per HolmichAbstract:Background Eccentric Hip adduction and abduction strength plays an important role in the treatment and prevention of groin injuries in soccer players. Lower extremity strength deficits of less than 10% on the injured side, compared to the uninjured side, have been suggested as the clinical milestone before returning to sports following injury. Objective To examine whether a side-to-side eccentric Hip adduction or abduction strength symmetry can be assumed in non-injured soccer players and matched controls. Material and Methods Nine elite soccer players 19.4 (1.5) years and nine recreational athletes 19.5 (2.0) years matched for sex, height and weight were included. Eccentric Hip adduction and abduction strength of the dominant and non-dominant leg was tested for all the participants using an eccentric break test with a handheld dynamometer. Results The dominant leg was 14% stronger than the non-dominant leg for Hip adduction in the soccer players (p Conclusion Eccentric Hip adduction strength was greater in the dominant leg than in the non-dominant leg in soccer players, but not in matched controls. Eccentric Hip abduction strength was greater in soccer players than matched controls, but soccer does not seem to induce a similar eccentric strength adaptation in the Hip Adductors.