Lower Extremity Power Generation and Absorption during the Single- Leg Hop Test

2004 ◽  
Vol 36 (Supplement) ◽  
pp. S100
Author(s):  
Karl F. Orishimo ◽  
Ian J. Kremenic ◽  
Michael J. Mullaney
Keyword(s):  
Power Generation ◽  
Lower Extremity ◽  
Hop Test ◽  
Single Leg Hop Test

Lower Extremity Power Generation and Absorption during the Single- Leg Hop Test

2004 ◽  
Vol 36 (Supplement) ◽  
pp. S100
Author(s):  
Karl F. Orishimo ◽  
Ian J. Kremenic ◽  
Michael J. Mullaney
Keyword(s):  
Power Generation ◽  
Lower Extremity ◽  
Hop Test ◽  
Single Leg Hop Test

scholarly journals Age, time from injury to surgery and quadriceps strength affect the risk of revision surgery after primary ACL reconstruction

2021 ◽  
Author(s):  
Riccardo Cristiani ◽  
Magnus Forssblad ◽  
Gunnar Edman ◽  
Karl Eriksson ◽  
Anders Stålman
Keyword(s):  
Risk Factors ◽  
Potential Risk ◽  
Revision Surgery ◽  
Quadriceps Strength ◽  
Activity Level ◽  
Hop Test ◽  
Potential Risk Factors ◽  
Tegner Activity Level ◽  
Single Leg Hop Test ◽  
Time From Injury

Abstract Purpose To identify preoperative, intraoperative and postoperative factors associated with revision anterior cruciate ligament reconstruction (ACLR) within 2 years of primary ACLR. Methods Patients who underwent primary ACLR at our institution, from January 2005 to March 2017, were identified. The primary outcome was the occurrence of revision ACLR within 2 years of primary ACLR. Univariate and multivariate logistic regression analyses were used to evaluate preoperative [age, gender, body mass index (BMI), time from injury to surgery, pre-injury Tegner activity level], intraoperative [graft type, graft diameter, medial meniscus (MM) and lateral meniscus (LM) resection or repair, cartilage injury] and postoperative [side-to-side (STS) anterior laxity, limb symmetry index (LSI) for quadriceps and hamstring strength and single-leg-hop test performance at 6 months] risk factors for revision ACLR. Results A total of 6,510 primary ACLRs were included. The overall incidence of revision ACLR within 2 years was 2.5%. Univariate analysis showed that age < 25 years, BMI < 25 kg/m2, time from injury to surgery < 12 months, pre-injury Tegner activity level ≥ 6, LM repair, STS laxity > 5 mm, quadriceps strength and single-leg-hop test LSI of ≥ 90% increased the odds; whereas, MM resection and the presence of a cartilage injury reduced the odds of revision ACLR. Multivariate analysis revealed that revision ACLR was significantly related only to age < 25 years (OR 6.25; 95% CI 3.57–11.11; P < 0.001), time from injury to surgery < 12 months (OR 2.27; 95% CI 1.25–4.17; P = 0.007) and quadriceps strength LSI of ≥ 90% (OR 1.70; 95% CI 1.16–2.49; P = 0.006). Conclusion Age < 25 years, time from injury to surgery < 12 months and 6-month quadriceps strength LSI of ≥ 90% increased the odds of revision ACLR within 2 years of primary ACLR. Understanding the risk factors for revision ACLR has important implications when it comes to the appropriate counseling for primary ACLR. In this study, a large spectrum of potential risk factors for revision ACLR was analyzed in a large cohort. Advising patients regarding the results of an ACLR should also include potential risk factors for revision surgery. Level of evidence III.

scholarly journals Preseason Functional Performance Test Measures Are Associated With Injury in Female College Volleyball Players

2020 ◽  
Vol 29 (3) ◽  
pp. 320-325 ◽  
Author(s):  
Jason Brumitt ◽  
Alma Mattocks ◽  
Jeremy Loew ◽  
Phil Lentz
Keyword(s):  
At Risk ◽  
Relative Risk ◽  
Performance Test ◽  
Functional Performance ◽  
Time Loss ◽  
Division Iii ◽  
Standing Long Jump ◽  
Hop Test ◽  
Long Jump ◽  
Single Leg Hop Test

Context:Preseason functional performance test measures have been associated with noncontact time-loss injury in some athletic populations. However, findings have been equivocal with many studies consisting of heterogeneous populations.Objective:To determine if preseason standing long jump and/or single-leg hop test scores are associated with a noncontact time-loss injury to the lower quadrant (LQ = low back or lower-extremities) in female Division III college volleyball (VB) players.Design:Prospective cohort study.Setting:National Collegiate Athletic Association Division III female VB teams.Patients:A total of 82 female college VB players (age = 18.9 [1.0] y).Main Outcome Measures:Standing long jump and single-leg hop test measures were collected at the start of the official preseason. Athletic trainers tracked all time-loss injuries and their mechanisms. Athletes were categorized as at risk if their preseason standing long jump <80% height, bilateral single-leg hop <70% height, and had a SLH side-to-side asymmetry >10%.Results:The noncontact time-loss overall injury rate for the LQ region in at-risk athletes was 13.5 (95% confidence interval [CI], 4.3–31.5) per 1000 athletic exposures. At-risk athletes were significantly more likely to experience a noncontact time-loss injury than VB players in the referent group (rate ratio = 6.2; 95% CI, 1.9–17.2;P = .008). The relative risk of sustaining a noncontact time-loss injury to the LQ was 4 times greater in the at-risk group (relative risk = 4.6; 95% CI, 2.1–10.1;P = .01). At-risk athletes were 6 times more likely to experience a foot or ankle injury (relative risk = 6.3; 95% CI, 2.1–19.2;P = .008).Conclusion:Suboptimal performance on a battery of functional performance tests is associated with a significantly greater risk of noncontact time-loss injury to the LQ in female Division III college VB players.

scholarly journals Reference values for fatigued versus non-fatigued limb symmetry index measured by a newly designed single-leg hop test battery in healthy subjects: a pilot study

2017 ◽  
Vol 14 (1) ◽  
pp. 105-113 ◽  
Author(s):  
Iris Leister ◽  
Georg Mattiassich ◽  
Harald Kindermann ◽  
Reinhold Ortmaier ◽  
Jürgen Barthofer ◽  
...  
Keyword(s):  
Pilot Study ◽  
Reference Values ◽  
Healthy Subjects ◽  
Test Battery ◽  
Symmetry Index ◽  
Limb Symmetry Index ◽  
Hop Test ◽  
Single Leg Hop Test

Discriminating age and disability effects in locomotion: neuromuscular adaptations in musculoskeletal pathology

2004 ◽  
Vol 96 (1) ◽  
pp. 149-160 ◽  
Author(s):  
Chris A. McGibbon ◽  
David E. Krebs
Keyword(s):  
Power Generation ◽  
Lower Extremity ◽  
Sagittal Plane ◽  
Plantar Flexion ◽  
Analysis Of Covariance ◽  
Power Absorption ◽  
Age Related ◽  
Neuromuscular Adaptations ◽  
Musculoskeletal Pathology ◽  
Lower Extremity Dysfunction

We identified biomechanical variables indicative of lower extremity dysfunction, distinct from age-related gait adaptations, and examined interrelationships among these variables to better understand the neuromuscular adaptations in gait. Sagittal plane ankle, knee, and hip peak angles, moments, and powers and spatiotemporal parameters were acquired during preferred-speed gait in 120 subjects: 45 healthy young, 37 healthy elders, and 38 elders with functional limitations due to lower extremity musculoskeletal pathology, primarily arthritis. Multiple analysis of covariance with discriminate analysis, adjusted for gait speed, was used to identify the variables discriminating groups. Correlation analysis was used to explore interrelationships among these variables within each group. Healthy elders were discriminated (sensitivity 76%, specificity 82%) from young adults via decreased late-stance ankle plantar flexion angle, increased late-stance knee power absorption, and early-stance hip extensor power generation. Disabled elders were discriminated (sensitivity 74%, specificity 73%) from healthy elders via decreased late-stance ankle plantar flexor moment and power generation, increased early-stance ankle dorsiflexor moment, and late-stance hip flexor moment and power absorption. Relationships among variables showed a higher degree of coupling for the disabled elders compared with the healthy groups, suggesting a reduced ability to alter motor strategies. Our data suggest that, beyond age-related changes, elders with lower extremity dysfunction rely excessively on passive action of hip flexors to provide propulsion in late stance and contralateral ankle dorsiflexors to enhance stability. These findings support a growing body of evidence that gait changes with age and disablement have a neuromuscular basis, which may be informative in a motor control framework for physical therapy interventions.

Improvement of Outcomes With Nonconcurrent Strength and Cardiovascular-Endurance Rehabilitation Conditioning After ACI Surgery to the Knee

2014 ◽  
Vol 23 (3) ◽  
pp. 235-243 ◽  
Author(s):  
Andrea Kay Bailey ◽  
Claire Minshull ◽  
James Richardson ◽  
Nigel P. Gleeson
Keyword(s):  
Outcome Measures ◽  
Repeated Measures ◽  
International Knee Documentation Committee ◽  
Knee Extensors ◽  
Electromechanical Delay ◽  
Cardiovascular Endurance ◽  
Patient Reported ◽  
Chondrocyte Implantation ◽  
Hop Test ◽  
Single Leg Hop Test

Context:Autologous chondrocyte implantation (ACI) aims to restore hyaline cartilage. Traditionally, ACI rehabilitation is prescribed in a concurrent (CON) format. However, it is well known from studies in asymptomatic populations that CON training produces an interference effect that can attenuate strength gains. Strength is integral to joint function, so adopting a nonconcurrent (N-CON) approach to ACI rehabilitation might improve outcomes.Objective:To assess changes in function and neuromuscular performance during 48 wk of CON and N-CON physical rehabilitation after ACI to the knee.Setting:Orthopedic Hospital NHS Foundation Trust.Design:Randomized control, pilot study.Participants:11 patients (9 male, 2 female; age 32.3 ± 6.6 y; body mass 79.3 ±10.4 kg; time from injury to surgery 7.1 ± 4.9 mo [mean ± SD]) randomly allocated to N-CON:CON (2:1).Interventions:Standardized CON and N-CON physiotherapy that involved separation of strength and cardiovascular-endurance conditioning.Main Outcome Measures:Function in the single-leg-hop test, patient-reported outcomes (Knee injury and Osteoarthritis Outcome Score [KOOS], International Knee Documentation Committee subjective questionnaire [IKDC]), and neuromuscular outcomes of peak force (PF), rate of force development (RFD), electromechanical delay (EMD), and sensorimotor performance (force error [FE]) of the knee extensors and flexors of the injured and noninjured legs, measured presurgery and at 6, 12, 24, and 48 wk postsurgery.Results:Factorial ANOVAs with repeated measures of group by leg and by test occasion revealed significantly superior improvements for KOOS, IKDC, PF, EMD, and FE associated with N-CON vs CON rehabilitation (F1.5,13.4 GG = 3.7−4.7, P < .05). These results confirm increased peak effectiveness of N-CON rehabilitation (~4.5−13.3% better than CON over 48 wk of rehabilitation). N-CON and CON showed similar patterns of improvement for single-leg-hop test and RFD.Conclusions:Nonconcurrent strength and cardiovascular-endurance conditioning during 48 wk of rehabilitation after ACI surgery elicited significantly greater improvements to functional and neuromuscular outcomes than did contemporary concurrent rehabilitation.

scholarly journals Análise funcional e comparativa da reconstrução do ligamento cruzado anterior utilizando autoenxerto patelar ipsilateral e contralateral

2021 ◽  
Author(s):  
Júlia Bairros ◽  
Márcio De Paula e Oliveira
Keyword(s):  
Balance Test ◽  
Kt 1000 ◽  
Hop Test ◽  
Single Leg Hop Test

A reconstrução cirúrgica do ligamento cruzado anterior pode levar à diminuição dodesempenho muscular, da funcionalidade das atividades de vida diária e da simetria bilateraldos membros inferiores. O presente estudo teve como objetivo comparar a simetria atingidapor pacientes submetidos a essa cirurgia utilizando o autoenxerto patelar ipsilateral econtralateral à lesão quatro meses após o procedimento para identificar o tratamento maisadequado a ser seguido. Método: Foi realizado um ensaio clínico randomizado cego com umaamostra de 88 participantes do gênero masculino com idade entre 18 e 35 anos praticantesamadores de futebol. Foi feita uma divisão aleatória em dois grupos (contralateral: n = 44;ipsilateral: n = 44), que foram avaliados de forma cega antes e quatro meses após a cirurgiaquanto à presença de sinais inflamatórios, amplitude de movimento, estabilidade articularobjetiva (KT-1000®), desempenho muscular (pico de torque e relação I/Q) e funcionalidadeobjetiva ( Single Leg Hop Test e Y Balance Test ) e subjetiva (Escala de Atividades de VidaDiária e Questionário de Lysholm). Resultados: As variáveis de amplitude de movimento,desempenho muscular e funcionalidade apresentaram alterações significativas entre osgrupos, sendo as diferenças entre os membros menores no grupo contralateral. Conclusão: Ogrupo contralateral apresentou maior simetria bilateral quatro meses após a intervençãocirúrgica quando comparado ao grupo ipsilateral, demonstrando que a reconstrução doligamento cruzado anterior com o autoenxerto patelar contralateral à lesão é um método eficaz para uma recuperação rápida da funcionalidade do paciente e seu retorno às atividades de vida diária

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