155 results match your criteria post-aclr


Identification of strength and spatiotemporal gait parameters associated with knee loading during gait in persons after anterior cruciate ligament reconstruction.

J Athl Train 2021 Jul;2021(preprint)

2 Department of Orthopaedics, Emory University School of Medicine, Atlanta, GA, USA.

Context: Altered knee moments are common during gait in patients following anterior cruciate ligament reconstruction (ACLR). Modifiable factors that influence knee moments and are feasible to record in clinical settings such as strength and spatiotemporal parameters (e.g. Read More

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Quality of Life Associates With Moderate to Vigorous Physical Activity Following Anterior Cruciate Ligament Reconstruction.

J Athl Train 2021 Jul 30. Epub 2021 Jul 30.

2Human Movement Science Curriculum, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

Context: Higher knee function is linked to psychological readiness to return to sport following anterior cruciate ligament reconstruction (ACLR). Individuals with ACLR participate in less physical activity compared to matched uninjured controls, yet the association between knee function and physical activity following ACLR remains unclear.

Objective: To determine the association between patient-reported knee function measured with the Knee Injury and Osteoarthritis Outcomes Score Quality of Life (KOOS-QOL), daily steps, and minutes spent in moderate to vigorous physical activity (MVPA) in individuals with ACLR. Read More

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Running Biomechanics Before Injury and 1 Year After Anterior Cruciate Ligament Reconstruction in Division I Collegiate Athletes.

Am J Sports Med 2021 Jul 14:3635465211026665. Epub 2021 Jul 14.

Department of Orthopedics and Rehabilitation, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Background: Preinjury running biomechanics are an ideal comparator for quantifying recovery after anterior cruciate ligament (ACL) reconstruction (ACLR), allowing for assessments within the surgical and nonsurgical limbs. However, availability of preinjury running biomechanics is rare and has been reported in case studies only.

Purpose/hypothesis: The purpose of this study was to determine if running biomechanics return to preinjury levels within the first year after ACLR among collegiate athletes. Read More

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Assessing Physical Activity After ACL Injury: Moving Beyond Return to Sport.

Sports Health 2021 Jun 29:19417381211025307. Epub 2021 Jun 29.

Motion Science Institute, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.

Context: Return to sport is widely utilized by sports medicine researchers and clinicians as a primary outcome of interest for successful recovery when working with young patients who have undergone anterior cruciate ligament (ACL) reconstruction (ACLR). While return-to-sport outcomes are effective at tracking progress post-ACLR, they are limited because they do not necessarily capture physical activity (PA) engagement, which is important to maintain knee joint health and reduce the risk of noncommunicable diseases. Therefore, there is a critical need (1) to describe current PA participation and measurement recommendations; (2) to appraise common PA measurement approaches, including patient-reported outcomes and device-based methodologies; and (3) to provide clinical recommendations for future evaluation. Read More

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Characteristics of landing impact in athletes who have not returned to sports at the pre-injury competition level after anterior cruciate ligament reconstruction.

Asia Pac J Sports Med Arthrosc Rehabil Technol 2021 Jul 4;25:47-52. Epub 2021 Jun 4.

Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.

Background: Most patients with anterior cruciate ligament (ACL) injury undergo ACL reconstruction (ACLR) with the expectation of being able to return to sport (RTS) at the same level of the competition as before the injury. The magnitude and asymmetry of landing impact are important post-ACLR functional variables related to increased ACL strain and poor athletic performance. However, the association between the RTS status and landing impact in post-ACLR patients is unknown. Read More

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Predicting ACL Reinjury from Return to Activity Assessments at 6-months Post-Surgery: A Prospective Cohort Study.

J Athl Train 2021 Jun 15. Epub 2021 Jun 15.

Department of Kinesiology. University of Virginia, Charlottesville, VA.

Context: Return to activity(RTA) assessments are commonly administered following ACL-Reconstruction(ACLR) to manage post-operative progressions back to activity. To date, there is little knowledge on the clinical utility of these assessments to predict patient outcomes such as secondary ACL injury once returned to activity.

Objective: To identify what measures of patient function at 6-months post-ACLR best predict return to activity and second ACL injury at a minimum of 2-years following ACLR. Read More

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Differences in fatigability of vastus medialis muscle between patients with limb symmetry index of <90% and ≥90% after chronic anterior cruciate ligament reconstruction.

Knee 2021 Jun 7;31:39-45. Epub 2021 Jun 7.

Department of Rehabilitation Medicine, Wakayama Medical University, Wakayama City, Wakayama 641-8509, Japan. Electronic address:

Background: A limb symmetry index (LSI) of ≥90% for the quadriceps is recommended for return to sports activity after anterior cruciate ligament reconstruction (ACLR). However, there is no information on differences in muscle fatigability between patients with LSI of <90% and ≥90%. The aim of this study was to assess the difference in quadriceps muscle fatigability on the involved side between post-ACLR patients with LSI of <90% and ≥90%. Read More

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Comparing myofascial meridian activation during single leg vertical drop jump in patients with anterior cruciate ligament reconstruction and healthy participants.

Gait Posture 2021 Jul 12;88:66-71. Epub 2021 May 12.

Department of Kinesiology, University of North Carolina at Charlotte Charlotte, NC, United States. Electronic address:

Background: Muscles work synergistically to support the body during landing. Myofascial meridians have been described to classify muscles into functional synergies. The role that these functional lines plays in positioning the trunk and lower extremity of patients with anterior cruciate ligament reconstruction (ACLR) and healthy athletes during drop landing tasks remains unclear. Read More

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The psychological readiness to return to sports of patients with anterior cruciate ligament reconstruction preoperatively and 6 months postoperatively.

Phys Ther Sport 2021 Jul 30;50:114-120. Epub 2021 Apr 30.

Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8519, Japan.

Objective: To determine the association of psychological readiness to return to sports preoperative and 6 months post-reconstruction in athletes with anterior cruciate ligament (ACL) injury.

Design: Retrospective cohort study.

Setting: Clinical center of sports medicine. Read More

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Skeletal muscle cellular contractile dysfunction after anterior cruciate ligament reconstruction contributes to quadriceps weakness at 6-month follow-up.

J Orthop Res 2021 May 10. Epub 2021 May 10.

Department of Orthopaedics and Rehabilitation, University of Vermont, Burlington, Vermont, USA.

Muscle dysfunction following anterior cruciate ligament reconstruction (ACLR) may evolve from alterations in muscle contractility at the myofilament protein level. Using a prospective, within-subject case-control design, we evaluated cellular-level contractility, cross-sectional area (CSA), and myosin heavy chain (MHC) isoform expression on single muscle fibers 3 weeks post ACLR, and evaluated their relationship to whole muscle strength and patient-oriented outcomes 6 months post operation. Biopsies of the vastus lateralis were performed 3 weeks post ACLR in 11 subjects (5 females, mean age ± SD = 24. Read More

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Injury-related fear in athletes returning to sports after anterior cruciate ligament reconstruction - A quantitative content analysis of an open-ended questionnaire.

Asia Pac J Sports Med Arthrosc Rehabil Technol 2021 Jul 7;25:1-7. Epub 2021 Apr 7.

Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.

Background/objective: Injury-related fear during sport activities are major psychological factors inhibiting a person's return to sports (RTS) following anterior cruciate ligament reconstruction (ACLR). Currently, there are no studies that quantitatively analyse the open-ended questionnaire for knee injury-related fear in post-ACLR athletes.The purpose of this study was to identify knee injury-related fear in athletes who return to ball-centric sports via the use of an open-ended questionnaire. Read More

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Individuals following anterior cruciate ligament reconstruction practice underloading strategies during daily activity.

J Orthop Res 2021 Apr 29. Epub 2021 Apr 29.

Human Performance Laboratory, Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, California, USA.

Underloading the surgical limb has been described in biomechanical studies across recovery time points following anterior cruciate ligament reconstruction (ACLr). This study aimed to examine the extent to which laboratory findings translate to daily activities. Limb loading was quantified during a sit-to-stand task in laboratory testing and throughout 2 days of daily activity in 15 individuals 114. Read More

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Should return to pivoting sport be avoided for the secondary prevention of osteoarthritis after anterior cruciate ligament reconstruction? A prospective cohort study with MRI, radiographic and symptomatic outcomes.

Osteoarthritis Cartilage 2021 Apr 18. Epub 2021 Apr 18.

La Trobe Sport and Exercise Medicine Research Centre, School of Allied Health, Human Services and Sport, La Trobe University, Bundoora, Australia. Electronic address:

Objective: To evaluate if returning to pivoting sport following anterior cruciate ligament reconstruction (ACLR) is associated with longitudinal structural and symptomatic osteoarthritis outcomes.

Design: Eighty-one adults aged 18-50 years were followed prospectively 1- to 5-years post-ACLR. Return to pivoting sport was assessed at 1-, 3- and 5-years. Read More

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Patellofemoral and tibiofemoral joint loading during a single-leg forward hop following ACL reconstruction.

J Orthop Res 2021 Apr 19. Epub 2021 Apr 19.

La Trobe Sports & Exercise Medicine Research Centre, La Trobe University, Melbourne, Victoria, Australia.

Altered biomechanics are frequently observed following anterior cruciate ligament reconstruction (ACLR). Yet, little is known about knee-joint loading, particularly in the patellofemoral-joint, despite patellofemoral-joint osteoarthritis commonly occurring post-ACLR. This study compared knee-joint reaction forces and impulses during the landing phase of a single-leg forward hop in the reconstructed knee of people 12-24 months post-ACLR and uninjured controls. Read More

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Recommendations for Movement Re-training After ACL Reconstruction.

Sports Med 2021 Aug 11;51(8):1601-1618. Epub 2021 Apr 11.

Faculty of Sport, Health and Applied Science, St Marys University, Twickenham, London, TW1 4SX, UK.

It is important to optimise the functional recovery process to enhance patient outcomes after major injury such as anterior cruciate ligament reconstruction (ACLR). Restoring movement quality during sporting-type movements is important prior to return-to-sport (RTS) after ACLR. Alterations in movement quality during an array of functional tasks are common amongst ACLR patients at or near the time of RTS and are associated with worse outcomes after ACLR. Read More

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The effects of a high-intensity exercise bout on landing biomechanics post anterior cruciate ligament reconstruction: a quasi-experimental study.

BMC Sports Sci Med Rehabil 2021 Apr 7;13(1):36. Epub 2021 Apr 7.

School of Physical Therapy. University of the Incarnate Word, San Antonio, TX, USA.

Background: We aimed to examine the effect of a high-intensity exercise bout on landing biomechanics in soccer players who underwent anterior cruciate ligament reconstruction (ACLR) and non-injured soccer players during a soccer-specific landing maneuver.

Methods: Eighteen soccer players who underwent ACLR and 18 normal soccer players were enrolled in this investigation (ACLR group; age, 26.11 ± 3. Read More

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Athletic identity and sport commitment in athletes after anterior cruciate ligament reconstruction who have returned to sports at their pre-injury level of competition.

BMC Sports Sci Med Rehabil 2021 Apr 7;13(1):37. Epub 2021 Apr 7.

Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo, 113-8519, Japan.

Background: This study aimed to determine the relationships between athletic identity and sport commitment and return to sports (RTS) status in athletes after anterior cruciate ligament reconstruction (ACLR).

Methods: Thirty-nine participants post-ACLR (8-24 months) were included in this cross-sectional study. Measures included the athletic identity measurement scale and sport commitment scale. Read More

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Changes in Infrapatellar Fat Pad Volume From 6 to 12 months Following Anterior Cruciate Ligament Reconstruction and Associations with Patient-Reported Knee Function.

J Athl Train 2021 Mar 31. Epub 2021 Mar 31.

b MOTION Science Institute, Department of Exercise and Sport Science, 209 Fetzer Hall, University of North Carolina at Chapel Hill, Chapel Hill 27599, NC, United States.

Context: Hypertrophy of the Infrapatellar Fat Pad (IFP) in idiopathic knee osteoarthritis has been linked to deleterious synovial changes and joint pain related to mechanical tissue impingement; yet, little is known regarding the IFP's volumetric changes following anterior cruciate ligament reconstruction (ACLR).

Objective: To examine changes in IFP volume between 6 and 12 months following ACLR and determine associations between patient-reported outcomes and IFP volume at each time point, as well as volume change over time. In a subset of individuals, we examined inter-limb IFP volume differences 12 months post-ACLR. Read More

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Synovial fluid concentrations of matrix Metalloproteinase-3 and Interluekin-6 following anterior cruciate ligament injury associate with gait biomechanics 6 months following reconstruction.

Osteoarthritis Cartilage 2021 Jul 27;29(7):1006-1019. Epub 2021 Mar 27.

MOTION Science Institute, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Human Movement Science Curriculum, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Department of Orthopaedics, School of Medicine, University of North Carolina at Chapel Hill, NC, 27599, USA.

Objective: To compare gait biomechanics 6 months following anterior cruciate ligament (ACL) reconstruction (ACLR) between patients with the highest and lowest concentrations of synovial fluid (SF) interleukin-6 (IL-6) and matrix metalloproteinase-3 (MMP-3), as well as compared to uninjured controls.

Design: SF concentrations of IL-6 and MMP-3 were collected 7 ± 4 days post injury in 38 ACL injured patients (55% female, 21±4yrs, 25.3 ± 5. Read More

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Age, rehabilitation and surgery characteristics are re-injury risk factors for adolescents following anterior cruciate ligament reconstruction.

Phys Ther Sport 2021 May 8;49:196-203. Epub 2021 Mar 8.

Department of Physical Therapy, Georgia State University, Atlanta, GA, USA. Electronic address:

Objectives: To examine the effect of age on post-ACLR rehabilitative outcomes and identify surgical/rehabilitative characteristics as ACL re-injury risk factors in adolescents.

Design: Cohort study.

Setting: Children's hospital. Read More

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Landing biomechanics deficits in anterior cruciate ligament reconstruction patients can be assessed in a non-laboratory setting.

J Orthop Res 2021 Mar 19. Epub 2021 Mar 19.

Granata Biomechanics Lab, Department of Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, Virginia, USA.

Landing biomechanics provide important information pertaining to second anterior cruciate ligament (ACL) injury risk in patients following ACL reconstruction (ACLR). While traditional motion analysis technologies are often impractical for use in non-laboratory settings, methods to assess landing biomechanics which are inexpensive, portable, and user-friendly have recently been developed and validated. The purpose of this study was to compare landing kinematics and kinetics between ACLR patients and uninjured controls in a non-laboratory setting. Read More

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Knee performance and self-efficacy trajectory curves after ACL reconstruction: A longitudinal study.

Phys Ther Sport 2021 May 4;49:157-163. Epub 2021 Mar 4.

Department of Physiotherapy, Changi General Hospital, Singapore. Electronic address:

Objectives: To examine knee flexion range-of-motion, quadriceps strength, and knee self-efficacy trajectory curves over 6 months after anterior cruciate ligament reconstruction (ACLR), stratified by patients' Month-6 sports activity level.

Design: Prospective longitudinal study.

Setting: Hospital outpatient physiotherapy department. Read More

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An obstacle clearance test for evaluating sensorimotor control after anterior cruciate ligament injury: A kinematic analysis.

J Orthop Res 2021 Mar 2. Epub 2021 Mar 2.

Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå, Sweden.

Sensorimotor deficits, particularly proprioceptive, are often reported following rupture of the anterior cruciate ligament (ACL). High secondary injury rates and long-term negative consequences suggest that these deficits are not properly identified using current assessment methods. We explored a novel obstacle clearance test to evaluate sensorimotor control in individuals following ACL reconstruction (ACLR) and rehabilitation. Read More

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Single-leg hop can result in higher limb symmetry index than isokinetic strength and single-leg vertical jump following anterior cruciate ligament reconstruction.

Knee 2021 Mar 22;29:160-166. Epub 2021 Feb 22.

Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Tokyo, Japan.

Background: A single-leg vertical jump height (SLVJ) may reflect knee extension strength more than a single-leg hop for distance (SLH). This study aimed to examine the relationships between the isokinetic knee extension torque, SLH, and SLVJ after anterior cruciate ligament reconstruction (ACLR).

Methods: Forty-four patients post-ACLR (median 12. Read More

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Anatomic single- and double-bundle ACL reconstruction both restore dynamic knee function: a randomized clinical trial-part II: knee kinematics.

Knee Surg Sports Traumatol Arthrosc 2021 Aug 22;29(8):2676-2683. Epub 2021 Feb 22.

Department of Orthopaedic Surgery, University of Pittsburgh, 3471 Fifth Avenue, Pittsburgh, PA, 15213, USA.

Purpose: Compare side-to-side differences for knee kinematics between anatomic single-bundle (SB) and anatomic double-bundle (DB) ACLR during downhill running at 6 and 24 months post ACLR using high-accuracy dynamic stereo X-ray imaging. It was hypothesized that anatomic DB ACLR would better restore tibio-femoral kinematics compared to SB ACLR, based on comparison to the contralateral, uninjured knee.

Methods: Active individuals between 14 and 50 years of age that presented within 12 months of injury were eligible to participate. Read More

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In vivo Compositional Changes in the Articular Cartilage of the Patellofemoral Joint following Anterior Cruciate Ligament Reconstruction.

Arthritis Care Res (Hoboken) 2021 Jan 18. Epub 2021 Jan 18.

University of North Florida, 1 UNF Drive, Jacksonville, FL, 32224, USA.

Objective: To compare T1ρ relaxation times of the medial and lateral regions of the patella and femoral trochlea at 6 and 12 months post-anterior cruciate ligament reconstruction (ACLR) on the ACLR and contralateral limb. Greater T1ρ relaxation times are associated with a lesser proteoglycan density of articular cartilage.

Methods: Twenty individuals (11 males, 9 females; age=22±3. Read More

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January 2021

Infrapatellar fat pad volume and Hoffa-synovitis after ACL reconstruction: Association with early osteoarthritis features and pain over 5 years.

J Orthop Res 2021 Jan 17. Epub 2021 Jan 17.

La Trobe Sport and Exercise Medicine Research Centre, School of Allied Health, Human Services and Sport, La Trobe University, Bundoora, Victoria, Australia.

Infrapatellar fat pad (IPFP) morphology and Hoffa-synovitis may be relevant to the development and progression of post-traumatic osteoarthritis (OA). We aimed to compare IPFP volume and Hoffa-synovitis in participants with anterior cruciate ligament reconstruction (ACLR) and uninjured controls, and to determine their association with prevalent and worsening early knee OA features and pain in participants post-ACLR. We assessed IPFP volume and Hoffa-synovitis from magnetic resonance imaging (MRI) in 111 participants 1-year post-ACLR and 20 uninjured controls. Read More

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January 2021

Exercise-therapy and education for individuals one year after anterior cruciate ligament reconstruction: a pilot randomised controlled trial.

BMC Musculoskelet Disord 2021 Jan 11;22(1):64. Epub 2021 Jan 11.

La Trobe Sport & Exercise Medicine Research Centre, School of Allied Health, Humans Services and Sport, La Trobe University, Bundoora, 3086, Australia.

Background: Guided rehabilitation beyond 6-months is rare following anterior cruciate ligament reconstruction (ACLR), despite high prevalence of unacceptable symptoms and quality of life (QoL). Our primary aim was to determine the feasibility of a randomised controlled trial (RCT) evaluating a physiotherapist-guided intervention for individuals 1-year post-ACLR with persistent symptoms. Our secondary aim was to determine if a worthwhile treatment effect could be observed for the lower-limb focussed intervention (compared to the trunk-focussed intervention), for improvement in knee-related QoL, symptoms, and function. Read More

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January 2021

Does sensorimotor function predict graft rupture, contra-lateral injury or failure to return to sports after ACL reconstruction? A protocol for the STOP Graft Rupture study.

BMJ Open 2021 01 8;11(1):e042031. Epub 2021 Jan 8.

Department of Community Medicine and Rehabilitation, Umeå Universitet, Umeå, Sweden.

Introduction: People with anterior cruciate ligament (ACL) reconstruction (ACLR) are at high risk of sustaining a graft rupture and/or contra-lateral ACL injury. The main factors that may predispose individuals for subsequent ACL injuries are, however, not established. To reduce the risk of reinjuries, it is of particular interest to identify modifiable risk-factors, for instance, those related to sensorimotor control which are responsive to training. Read More

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January 2021

The effect of simulated marker misplacement on the interpretation of inter-limb differences during a change of direction task.

J Biomech 2021 02 24;116:110184. Epub 2020 Dec 24.

Department of Life Sciences, University of Roehampton, London, UK.

The objective assessment of biomechanical asymmetries during movement tasks is used to monitor rehabilitation following anterior cruciate ligament reconstruction (ACLR). Marker placement is an important source of methodological variability within human motion analysis. It is currently unclear how marker placement error effects the interpretation of biomechanical asymmetries throughout post ACLR rehabilitation. Read More

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February 2021