1,525 results match your criteria ligament torque

Ultrasound-Guided Anterior Talofibular Ligament Repair With Augmentation Can Restore Ankle Kinematics: A Cadaveric Biomechanical Study.

Orthop J Sports Med 2022 Aug 5;10(8):23259671221111397. Epub 2022 Aug 5.

Orthopaedic Robotics Laboratory, Center for Biotechnology and Bioengineering, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.

Background: Anterior talofibular ligament (ATFL) repair of the ankle is a common surgical procedure. Ultrasound (US)-guided anchor placement for ATFL repair can be performed anatomically and accurately. However, to our knowledge, no study has investigated ankle kinematics after US-guided ATFL repair. Read More

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Influence of tibial plateau levelling osteotomy on the tensile forces sustained by ligaments in cranial cruciate ligament-intact canine stifles: An ex vivo pilot study.

Vet Med Sci 2022 Aug 10. Epub 2022 Aug 10.

Faculty of Veterinary Medicine, Division of Veterinary Surgery, Department of Veterinary Science, Nippon Veterinary and Life Science University, Musashino-shi, Tokyo, Japan.

Background: Tibial plateau levelling osteotomy (TPLO) changes the anatomical tibial conformation and might alter the positional relationship of the ligaments comprising the stifle joint. As a result, it is expected to affect the tensile force of the ligaments. However, studies analyzing the details of the effect of osteotomy are limited. Read More

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Single-joint Hybrid Assistive Limb in Knee Rehabilitation after ACL Reconstruction: An Open-label Feasibility and Safety Trial.

Prog Rehabil Med 2022 21;7:20220036. Epub 2022 Jul 21.

Department of Orthopaedic Surgery, Faculty of Medicine, University of Tsukuba, Tsukuba, Japan.

Objectives: To achieve better outcomes, neuromuscular and biomechanical factors should be considered in rehabilitation after anterior cruciate ligament reconstruction. In this study, we investigated the feasibility and safety of a wearable exoskeleton robot suit [known as the single-joint hybrid assistive limb (HAL-SJ)] and whether knee training using this device could improve functional outcomes after anterior cruciate ligament reconstruction.

Methods: HAL-SJ-assisted knee extension and flexion exercises were commenced in 11 patients 18 weeks after reconstruction; exercises were performed once a week for three weeks at a frequency of five sets of ten repetitions. Read More

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Torque movement of the upper anterior teeth using a clear aligner in cases of extraction: a finite element study.

Prog Orthod 2022 Aug 1;23(1):26. Epub 2022 Aug 1.

State Key Laboratory of Military Stomatology and National Clinical Research Center for Oral Diseases and Shaanxi Clinical Research Center for Oral Diseases, Department of Orthodontics, School of Stomatology, Air Force Medical University, Xi'an, 710032, China.

Background: Clear aligner treatment has become popular over recent years. It is necessary to identify methods by which we could avoid the bowing effect in extractions with clear aligner. The present study was to identify the appropriate method to design torque movement involving the upper anterior teeth of extraction cases, in order to maintain or improve the axis and torque of the upper anterior teeth with a clear aligner during movement and closure of the extraction space. Read More

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Portable dynamic ultrasonography is a useful tool for the evaluation of suspected syndesmotic instability: a cadaveric study.

Knee Surg Sports Traumatol Arthrosc 2022 Jul 26. Epub 2022 Jul 26.

Foot and Ankle Research and Innovation Laboratory, Massachusetts General Hospital, Harvard Medical School, Boston, USA.

Purpose: Portable ultrasonography (P-US) is increasingly used to diagnose syndesmotic instability. The aim of this study was to evaluate syndesmotic instability by measuring the distal tibiofibular clear space (TFCS) in a cadaveric model using P-US with progressive stages of syndesmotic ligamentous transection under external rotation stress.

Methods: Ten fresh lower leg cadaveric specimens amputated above the proximal tibiofibular joint were used. Read More

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Application of biologics for ridge preservation/reconstruction after implant removal.

Clin Adv Periodontics 2022 Jul 22. Epub 2022 Jul 22.

Private practice, Madrid, Spain.

Focused Clinical Question: The purpose of this review was aimed at providing the rationale supported with a series of cases to apply biologics to enhance orchestrating the healing process at implant removal sites.

Summary: Implant removal is commonly applied on a daily basis, in particular, in cases that exhibit esthetic failures linked to inadequate implant position or in cases of advanced peri-implantitis. Implant removal sites differ substantially from tooth extraction sockets. Read More

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Sonographic morphological and qualitative deficits in the elbow ulnar collateral ligament and ulnohumeral joint in throwing arms of asymptomatic collegiate baseball pitchers.

Skeletal Radiol 2022 Jul 21. Epub 2022 Jul 21.

Division of Biokinesiology and Physical Therapy, University of Southern California, 1540 Alcazar Street, CHP 155, Los Angeles, CA, 90089, USA.

Objective: The ulnar collateral ligament (UCL) supports the medial elbow against valgus torque and is commonly injured in baseball pitchers. Changes in UCL morphology and pathology occur with long-term pitching, with more severe findings at higher competition levels. We examined the bilateral differences and the relationship between UCL morphology, pathology, and ulnohumeral joint laxity in asymptomatic collegiate pitchers using ultrasound. Read More

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Pre-operative knee extensor and flexor torque after secondary ACL rupture: a comparative retrospective analysis.

BMC Sports Sci Med Rehabil 2022 Jul 19;14(1):135. Epub 2022 Jul 19.

Rennbahnklinik, Muttenz, Switzerland.

Background: Secondary anterior cruciate ligament (ACL) ruptures are a relevant clinical concern after surgical treatment of a primary ACL rupture. However, there is a lack of scientific evidence related to the role of muscle strength prior to revision surgery in a second ACL rupture. The aim of this study was to assess differences in knee extensor and flexor strength in patients before primary and secondary ACL reconstruction compared to healthy controls. Read More

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Isokinetic Muscle Strength in Elite Soccer Players 3 and 6 months After Anterior Cruciate Ligament Reconstruction.

J Strength Cond Res 2022 Jul 8. Epub 2022 Jul 8.

Department of Physiology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia.

Abstract: Milutinović, A, Jakovljević, V, Dabović, M, Faude, O, Radovanović, D, and Stojanović, E. Isokinetic muscle strength in elite soccer players 3 months and 6 months after anterior cruciate ligament reconstruction. J Strength Cond Res XX(X): 000-000, 2022-The aim of this study was to evaluate interlimb symmetry in quadriceps and hamstring peak torque of elite soccer players at 3 months (stage 1) and 6 months (stage 2) after anterior cruciate ligament (ACL) reconstruction. Read More

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Modified Lemaire Lateral Extra-articular Tenodesis With the Iliotibial Band Strip Fixed on the Femoral Cortical Surface Reduces Laxity and Causes Less Overconstraint in the Anterolateral Lesioned Knee: A Biomechanical Study.

Arthroscopy 2022 Jun 28. Epub 2022 Jun 28.

Department of Sports Medicine, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China. Electronic address:

Purpose: To compare the biomechanical effects of femoral cortical surface fixation and intra-tunnel fixation in modified Lemaire tenodesis on the restoration of native kinematics in anterolateral structure-deficient knees.

Methods: Eight fresh-frozen cadaveric knees were mounted in a knee-customized jig to evaluate anterior translation in anterior load and internal rotation degree in internal rotation torque at 0°, 30°, 60°, and 90°, as well as anterolateral translation (ALT) in a simulated pivot-shift test at 0°, 15°, 30°, and 45°. Kinematic tests were performed in the following states: intact; anterolateral knee lesion (AL-Les); modified Lemaire lateral extra-articular tenodesis (LET) with the femoral iliotibial band (ITB) strip fixed on the cortical surface (cortical fixation), deep to the lateral collateral ligament (LCL) (deep LET-C); and LET with the femoral ITB strip fixed into a tunnel (intra-tunnel fixation), deep to the LCL (deep LET-IT) or superficial to the LCL (superficial LET-IT). Read More

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The Relationship between the Hamstring-to-Quadriceps Ratio and Jumping and Sprinting Abilities of Young Male Soccer Players.

Int J Environ Res Public Health 2022 06 18;19(12). Epub 2022 Jun 18.

Department of Child Development, Faculty of Health Science, Bilecik Şeyh Edebali University, Bilecik 11000, Turkey.

The correct torque ratio between the knee joint extensor and flexor muscle groups can effectively prevent injuries to the anterior cruciate ligament and hamstring strain. However, it is unclear whether a high torque ratio of the knee joint flexor muscles to the extensor muscles is beneficial for sport performance. Therefore, the aim of the study was to investigate the relationship between the hamstring-to-quadriceps (H/Q) ratio and sprint times (10- and 30-m) and jump heights (CMJ-countermovement jump and SJ-squat jump) in soccer players. Read More

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Biomechanical Comparison of Ulnar Collateral Ligament Reconstruction With and Without Suture Augmentation.

Am J Sports Med 2022 07 20;50(9):2508-2514. Epub 2022 Jun 20.

Orthopaedic Biomechanics Laboratory, Cedars-Sinai, Los Angeles, California, USA.

Background: A common concern associated with elbow ulnar collateral ligament (UCL) reconstruction is the amount of time required for recovery and rehabilitation. For example, for Major League Baseball pitchers, the average time to return to competition ranges from 13.8 to 20. Read More

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Short-Term Clinical Outcomes After Anterior Cruciate Ligament Reconstruction In Adolescents During The COVID-19 Pandemic.

Int J Sports Phys Ther 2022 1;17(4):585-592. Epub 2022 Jun 1.

Doctor of Physical Therapy Program, Tufts University School of Medicine.

Background/purpose: The COVID-19 pandemic has impacted adolescents across multiple areas of health. While many factors influence outcomes following anterior cruciate ligament reconstruction (ACLR), the impact of the COVID-19 pandemic on early patient outcomes after ACLR is currently unknown in an adolescent population. The purpose of this study was to determine if short-term clinical outcomes were different in adolescents after ACLR for those who underwent surgery pre-COVID versus during the COVID-19 pandemic timeframe. Read More

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Femur Length is Correlated with Isometric Quadriceps Strength in Post-Operative Patients.

Int J Sports Phys Ther 2022 2;17(4):628-635. Epub 2022 Jun 2.

Twin City Orthopedics.

Background: Few existing studies have examined the relationship between lower extremity bone length and quadriceps strength.

Purpose/hypothesis: To evaluate the relationship between lower extremity, tibia and femur lengths, and isometric quadriceps strength in patients undergoing knee surgery. The null hypothesis was that there would be no correlation between lower extremity length and isometric quadriceps strength. Read More

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Gap balanced adjusted mechanical alignment versus measured resection mechanical alignment: a randomised controlled trial.

Arch Orthop Trauma Surg 2022 Jun 12. Epub 2022 Jun 12.

Exeter Knee Reconstruction Unit, RD+E Hospital, Exeter, UK.

Introduction: Alignment goals in total knee replacement (TKR) is a topical subject. This study compares the short-term functional outcomes and patient reported outcome measures (PROMs) of two philosophies for knee arthroplasty alignment: measured resection (MR) and an individualised alignment philosophy, with the tibia mechanically aligned and an instrumented gap balancer (GB) to align the femur in both flexion and extension.

Patients And Methods: 94 knees were enrolled in this randomised controlled trial. Read More

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Are 6-Month Functional and Isokinetic Testing Measures Risk factors for Second Anterior Cruciate Ligament Injuries at Long term Follow-Up?

J Knee Surg 2022 Jun 10. Epub 2022 Jun 10.

Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota.

Introduction:  Second anterior cruciate ligament (SACL) injuries are a devastating complication following return to sport (RTS). Appropriate and safe RTS criteria that reduce the risk of SACL injuries are needed. The goal of this study was to investigate the relationship between functional and isokinetic testing at 6 months following primary ACL reconstruction (ACLR) as risk factors for SACL injuries. Read More

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Is There an Association in Young Patients Between Quadriceps or Hamstring Strength After ACL Reconstruction and Graft Rupture?

Orthop J Sports Med 2022 Jun 3;10(6):23259671221101003. Epub 2022 Jun 3.

School of Allied Health, Human Services and Sport, La Trobe University, Melbourne, Australia.

Background: Younger patients who sustain anterior cruciate ligament (ACL) ruptures are at high risk for reinjury after ACL reconstruction. Restoring muscle strength before return to sports (RTS) is regarded as an important factor in reducing the reinjury risk, and quadriceps and hamstring strength assessment is commonly included in RTS testing. However, it is not clear whether reduced strength is a risk factor for subsequent graft rupture in this patient population. Read More

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Cross-sectional study on relationships between physical function and psychological readiness to return to sport after anterior cruciate ligament reconstruction.

BMC Sports Sci Med Rehabil 2022 Jun 1;14(1):97. Epub 2022 Jun 1.

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

Background: Information about specific factors of physical function that contribute to psychological readiness is needed to plan rehabilitation for a return to sports. The purpose of this study was to identify specific physical functions related to the psychological readiness of patients aiming to return to sports 6 months after reconstruction. We hypothesized that the knee strength is a factor related to the Anterior Cruciate Ligament-Return to Sport after Injury scale (ACL-RSI) cutoff score for a return to sports. Read More

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Bilateral impairments of quadriceps neuromuscular function occur early after anterior cruciate ligament injury.

Res Sports Med 2022 May 29:1-14. Epub 2022 May 29.

Department of Orthopaedics and Traumatology, Faculty of Medicine, the Chinese University of Hong Kong, Hong Kong SAR, China.

The study aimed to investigate the impairments in quadriceps neuromuscular function, including strength, rate of torque development (RTD) and activation failure (QAF) early after an ACL injury. A cross-sectional study was conducted. Thirty physically active patients with a primary ACL injury within three months, aged 18 to 40 years old, and who were scheduled for ACL reconstruction were included. Read More

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Disagreement in Pass Rates Between Strength and Performance Tests in Patients Recovering From Anterior Cruciate Ligament Reconstruction.

Am J Sports Med 2022 07 23;50(8):2111-2118. Epub 2022 May 23.

Department of Orthopaedics, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA.

Background: Performance on strength and functional tests is often used to guide postoperative rehabilitation progress and return to activity decisions after anterior cruciate ligament reconstruction (ACLR). Clinicians may have difficulty in determining which criteria to follow if there is disagreement in performance outcomes among the tests.

Purpose/hypothesis: The purpose of this study was to compare pass rates between strength tests and single-leg hop (SLHOP) tests among men and women and between patients with lower and higher preinjury activity levels recovering from ACLR. Read More

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The Control of Anteromedial Rotatory Instability Is Improved With Combined Flat sMCL and Anteromedial Reconstruction.

Am J Sports Med 2022 07 23;50(8):2093-2101. Epub 2022 May 23.

Department of Trauma, Hand and Reconstructive Surgery, University of Muenster, Muenster, Germany.

Background: Both the superficial medial collateral ligament (sMCL) and the deep MCL (dMCL) contribute to the restraint of anteromedial (AM) rotatory instability (AMRI). Previous studies have not investigated how MCL reconstructions control AMRI.

Purpose/hypothesis: The purpose was to establish the optimal medial reconstruction for restoring normal knee kinematics in an sMCL- and dMCL-deficient knee. Read More

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Modified Lemaire tenodesis reduces anterior cruciate ligament graft forces during internal tibial torque loading.

J Exp Orthop 2022 May 18;9(1):45. Epub 2022 May 18.

Department for Orthopaedics and Traumatology, Medical University of Innsbruck, Anichstraße 35, 6020, Innsbruck, Austria.

Purpose: The aim of the study was to directly measure graft forces of an anterior cruciate ligament reconstruction (ACLR) and a lateral extra-articular tenodesis (LET) using the modified Lemaire technique in combined anterior cruciate ligament (ACL) deficient and anterolateral rotatory instable knees and to analyse the changes in knee joint motion resulting from combined ACLR + LET.

Methods: On a knee joint test bench, six fresh-frozen cadaveric specimens were tested at 0°, 30°, 60°, and 90° of knee flexion in the following states: 1) intact; 2) with resected ACL; 3) with resected ACL combined with anterolateral rotatory instability; 4) with an isolated ACLR; and 5) with combined ACLR + LET. The specimens were examined under various external loads: 1) unloaded; 2) with an anterior tibial translation force (ATF) of 98 N; 3) with an internal tibial torque (IT) of 5 Nm; and 4) with a combined internal tibial torque of 5 Nm and an anterior tibial translation force of 98 N (IT + ATF). Read More

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Does Kinematic Alignment Increase Polyethylene Wear Compared With Mechanically Aligned Components? A Wear Simulation Study.

Clin Orthop Relat Res 2022 05 17. Epub 2022 May 17.

Laboratory of Biomechanics and Implant Research, Department of Orthopaedics, Heidelberg University Hospital, Heidelberg, Germany.

Background: Kinematic alignment is an alternative approach to mechanical alignment. Kinematic alignment can restore the joint line to its prearthritic condition, and its advocates have suggested it may be associated with other benefits. But this alignment approach often results in tibial components that are placed in varus and femoral components that are placed in valgus alignment, which may result in an increased risk of component loosening because of wear. Read More

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Elbow Ulnar Collateral Ligament Injuries in Overhead Athletes: An Infographic Summary.

Jason L Zaremski

Sports Health 2022 Jul-Aug;14(4):527-529. Epub 2022 May 12.

Department of Physical Medicine and Rehabilitation, College of Medicine, University of Florida, Gainesville, FL.

Ulnar collateral ligament (UCL) injuries of the elbow are common in throwing athletes. Given that the UCL's primary function is to provide valgus stability during the deceleration phase of throwing, injury to the UCL will render throwing difficult to nearly impossible. Injuries will occur more so in the sports of baseball, softball, and javlineers participating in track and field. Read More

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Biomechanical Evaluation of Modified ACL Reconstruction with Over-the-Top Augmentation Technique.

Indian J Orthop 2022 May 31;56(5):812-820. Epub 2022 Jan 31.

Department of Orthopedic Surgery, Ajou University School of Medicine, 164 Worldcup-ro, Yongtong-gu, Suwon, 16499 Korea.

Background: Modified ACL reconstruction with over-the-top augmentation technique (OA-ACLR) was designed to allow one-stage revision regardless of tunnel conditions as well as to offer firm stability by hybrid double-fixation. Thus, the purpose of the study is to biomechanically evaluate its effect on knee stability by comparing it with single-bundle ACL reconstruction (SB-ACLR).

Methods: Ten porcine knees were sequentially tested using a custom testing system for intact ACL, ACL deficiency, SB-ACLR and OA-ACLR. Read More

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Selective bundle reconstruction for symptomatic partial anterior cruciate ligament tears demonstrates good functional scores, high return to sport rates and a low re-tear rate.

Knee 2022 Jun 5;36:53-64. Epub 2022 May 5.

Perth Orthopaedic & Sports Medicine Centre, West Perth, Western Australia 6005, Australia.

Background: The treatment of symptomatic partial anterior cruciate ligament (ACL) tears remains controversial. This study investigated the clinical and functional outcome of patients undergoing selective posterolateral (PLB) or anteromedial (AMB) bundle reconstruction.

Methods: 55 consecutive patients underwent partial bundle reconstruction, of which 45 (AMB = 17, PLB = 28) were included in the current analysis (62% male, mean age of 29. Read More

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Medial Collateral Ligament Reconstruction for Anteromedial Instability of the Knee: A Biomechanical Study In Vitro.

Am J Sports Med 2022 06 5;50(7):1823-1831. Epub 2022 May 5.

Biomechanics Group, Department of Mechanical Engineering, Imperial College London, London, UK.

Background: Although a medial collateral ligament (MCL) injury is associated with anteromedial rotatory instability (AMRI) and often with an anterior cruciate ligament (ACL) injury, there has been little work to develop anteromedial (AM) reconstruction to address this laxity.

Purpose: To measure the ability of a novel "anatomic" AM reconstruction technique to restore native knee laxity for isolated AM insufficiency and combined AM plus posteromedial insufficiency.

Study Design: Controlled laboratory study. Read More

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Biomechanical comparison of novel ulnar collateral ligament reconstruction with internal brace augmentation vs. modified docking technique.

J Shoulder Elbow Surg 2022 Apr 30. Epub 2022 Apr 30.

Arthrex, Inc., Naples, FL, USA.

Background: Ulnar collateral ligament (UCL) reconstruction (UCLR) is a common surgery among baseball pitchers. UCL repair combined with augmentation using high-strength tape, referred to as an internal brace, was developed as an alternative to UCLR in select patients with the benefit of allowing these athletes to return to sport (RTS) faster. A combined UCLR with an internal brace may allow players indicated for a UCLR to RTS more expeditiously. Read More

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Valgus fatigue and nonlinear damage accretion of the anterior bundle of the elbow medial collateral ligament (AMCL).

J Biomech 2022 05 18;137:111094. Epub 2022 Apr 18.

University of Pittsburgh, United States. Electronic address:

Failure by fatigue is one mechanism by which ligaments can rupture, with the accumulation of damage gradually degrading the ligament strength. Baseball pitchers who perform repeated high-level throwing continuously subject the medial ligament complex of the elbow to extreme levels of loading, which can lead to fatigue and eventual rupture. This study sought to investigate this behavior and quantify the fatigue properties of the anterior bundle of the medial collateral ligament (AMCL) with respect to valgus elbow torque. Read More

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Is contralateral autogenous patellar tendon graft a better choice than ipsilateral for anterior cruciate ligament reconstruction in young sportsmen? A randomized controlled trial.

Knee 2022 Jun 22;36:33-43. Epub 2022 Apr 22.

Department of Orthopedics, Traumatology and Sports Medicine, Federal University of São Paulo (UNIFESP), São Paulo, Brazil.

Aim: The aim of this study was to compare the peak extensor torque (primary outcome), sensory-motor capacity and Lysholm questionnaire score up to the fourth postoperative month post-primary anterior cruciate ligament reconstruction (ACLR) with bone-patellar-tendon-bone (BPTB) graft using either ipsilateral or contralateral technique in young sportsmen.

Methods: We performed a randomized controlled trial from 2018 to 2019. The same preoperative protocol, surgical technique and postoperative protocol were used in both groups. Read More

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