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https://www.readbyqxmd.com/read/29450567/coronal-tibial-anteromedial-tunnel-location-has-minimal-effect-on-knee-biomechanics
#1
Shigehiro Asai, Donghwi Kim, Yuichi Hoshino, Chan-Woong Moon, Akira Maeyama, Monica Linde, Patrick Smolinski, Freddie H Fu
PURPOSE: Studies have found anatomic variation in the coronal position of the insertion site of anteromedial (AM) bundle of the anterior cruciate ligament (ACL) on the tibia, which can lead to questions about tunnel placement during ACL reconstruction. The purpose of this study was to determine how mediolateral placement of the tibial AM graft tunnel in double-bundle ACL reconstructions affects knee biomechanics. METHODS: Two different types of double-bundle ACL reconstructions were performed...
February 15, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29447910/preventing-non-contact-acl-injuries-in-female-athletes-what-can-we-learn-from-dancers
#2
Catherine Turner, Sarah Crow, Thomas Crowther, Brittany Keating, Trenton Saupan, Jason Pyfer, Kimberly Vialpando, Szu-Ping Lee
OBJECTIVES: To investigate the effects of dance experience and movement instruction on lower extremity kinematics and muscle activation during a landing task. DESIGN: Cross-sectional case control. SETTING: Laboratory setting. PARTICIPANTS: 27 female subjects (age 18-25) in 2 groups: dancers (n = 12) and non-dancers (n = 15). MAIN OUTCOME MEASURES: Lower extremity biomechanics during drop landing were analyzed...
December 23, 2017: Physical Therapy in Sport
https://www.readbyqxmd.com/read/29443845/raising-the-joint-line-in-tka-is-associated-with-mid-flexion-laxity-a-study-in-cadaver-knees
#3
Thomas Luyckx, Hilde Vandenneucker, Lennart Scheys Ing, Evie Vereecke, Arnout Victor Ing, Jan Victor
BACKGROUND: In a typical osteoarthritic knee with varus deformity, distal femoral resection based off the worn medial femoral condyle may result in an elevated joint line. In a setting of fixed flexion contracture, the surgeon may choose to resect additional distal femur to obtain extension, thus purposefully raising the joint line. However, the biomechanical effect of raising the joint line is not well recognized. QUESTIONS/PURPOSES: (1) What is the effect of the level of the medial joint line (restored versus raised) on coronal plane stability of a TKA? (2) Does coronal alignment technique (mechanical axis versus kinematic technique) affect coronal plane stability of the knee? (3) Can the effect of medial joint-line elevation on coronal plane laxity be predicted by an analytical model? METHODS: A TKA prosthesis was implanted in 10 fresh frozen nonarthritic cadaveric knees with restoration of the medial joint line at its original level (TKA0)...
March 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29442244/postural-assessment-in-class-iii-patients-before-and-after-orthognathic-surgery
#4
Fernando Zugno Kulczynski, Fernando de Oliveira Andriola, Pedro Henrique Deon, Denizar Alberto da Silva Melo, Rogério Miranda Pagnoncelli
PURPOSE: This study aimed to assess body posture before and after bimaxillary orthognathic surgery by photogrammetry in skeletal class III patients. METHODS: Thirty-one patients with skeletal class III dentofacial deformities (14 men, 17 women) who underwent orthodontic preparation for surgery were included in this non-randomized controlled trial. Of these, 15 who did not undergo orthognathic surgery during the period of this study served as controls. Postural assessment was performed by photogrammetry using SAPO® (Postural Assessment Software) based on anterior-, posterior-, and lateral-view images taken 1 month before and 4 months after bimaxillary orthognathic surgery with internal rigid fixation (or 4 months after the initial assessment, for the control group)...
February 13, 2018: Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29434808/double-bundle-revision-anterior-cruciate-ligament-reconstruction-is-effective-in-rescuing-failed-primary-reconstruction-and-re-introducing-patients-to-physical-exercise
#5
Changqing Jiang, Guofei Chen, Peng Chen, Wei Li, Honglei Zhang, Wentao Zhang
The anterior cruciate ligament (ACL) is one of a pair of cruciate ligaments in the human knee and is critical for knee stability, as it limits anterior tibial translation on the femur, restrains rotation and resists varus and valgus joint forces. The present study aimed to assess the effect of double-bundle revision anterior cruciate ligament (ACL) reconstruction in improving the subjective and objective functions and re-introducing patients to physical activity after primary ACL reconstruction had failed. A total of 34 patients who underwent double-bundle ACL revision surgeries were included in the present retrospective study...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29433583/mid-term-survivorship-of-cruciate-retaining-versus-posterior-stabilized-total-knee-arthroplasty-using-modular-mini-keel-tibial-implants
#6
Cheng-Pang Yang, Kuo-Yao Hsu, Yu-Han Chang, Yi-Sheng Chan, Hsin-Nung Shih, Alvin Chao-Yu Chen
BACKGROUND: Reports of diverse outcomes in modular mini-keel tibial componentry for total knee arthroplasty (TKA) have raised concerns about early aseptic loosening. Cruciate-retaining (CR) prostheses, using mini-keel implants, have yet to be reported and compared to posterior-stabilizing (PS) designs. METHODS: A retrospective, case-matched study of 91 consecutive TKAs (n = 46 CR; n = 45 PS prostheses), using modular mini-keel tibial componentry with a 45-mm drop down stem extension, was conducted...
February 13, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29429044/timing-not-magnitude-of-force-may-explain-sex-dependent-risk-of-acl-injury
#7
Haraldur B Sigurðsson, Þórarinn Sveinsson, Kristín Briem
PURPOSE: The anterior cruciate ligament is loaded through valgus moment, vertical ground reaction force, and internal rotation moment. The aim of this study was to compare the timing of force peaks during early stance between youth girls and boys. METHODS: One-hundred and twenty-nine team sport athletes aged 9-12 completed a total of 2540 cutting maneuvers captured with an 8-camera motion capture system. Timing of early force peaks was analyzed within 100 ms after ground contact...
February 10, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29427218/short-to-mid-term-outcomes-of-anatomic-mcl-reconstruction-with-achilles-tendon-allograft-after-multiligament-knee-injury
#8
Ian J Barrett, Aaron J Krych, Ayoosh Pareek, Nicholas R Johnson, Diane L Dahm, Michael J Stuart, Bruce A Levy
PURPOSE: Multiple techniques have been described in the literature for reconstruction of the medial collateral ligament. The purpose of this study is to describe functional outcome, range of motion, and knee stability following anatomic MCL reconstruction utilizing an Achilles tendon bone allograft after multiligament knee injury. METHODS: A comprehensive search of a single-hospital multiligament knee injury (MLKI) procedural database was conducted to identify all patients that underwent reconstruction of the MCL utilizing an Achilles tendon bone allograft and with 2-year clinical follow-up...
February 9, 2018: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
https://www.readbyqxmd.com/read/29424164/-research-progress-on-the-etiology-and-treatment-of-patellofemoral-pain-syndrome
#9
REVIEW
Li-Hua Cui
Patellofemoral pain syndrome (PFPS) is one of the most common diseases that cause pain in the knee joint. At present, there is no specific diagnostic measure. The diagnosis of patellofemoral pain syndrome may be considered when imaging is performed without cartilage, ligament and soft tissue injuries. The etiology includes abnormalities of the patellar motion caused by various anatomical abnormalities, such as abnormal patellar position, increased Q angle, and excessive valgus foot. Dysfunction of the lower extremity muscles such as the imbalance of the four biceps and the dysfunction of the gluteal muscles also play an important role in the development of patellofemoral pain syndrome...
July 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29419685/the-adaptive-change-of-patellofemoral-joint-after-arthroscopic-discoid-lateral-meniscus-plasty-an-observational-study
#10
Jiangtao Dong, Hongtao Xu, Guorong Jin, Dongmei Xin, Jian Zhang, Kai Kang, Shijun Gao, Baicheng Chen, Yong Shen
The purpose of this study was to investigate the patellofemoral joint adaptive changes after discoid lateral meniscus (DLM) plasty.Forty-one patients with unilateral complete type DLM tears were included in this study. Demographic variables, including gender, age, body mass index (BMI), injury to operation interval, type of injury, and follow-up time, were recorded. The evolution of physical examination, imaging index, and functional score were analyzed by Chi-squared test, Wilcoxon signed ranks test, and Friedman test...
February 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29414117/structural-differences-in-the-lower-extremities-in-children-aged-7-9-years-caused-by-playing-football-a-cross-sectional-study
#11
Salvador Diaz-Miguel, Eva Lopezosa-Reca, Salomon Benhamu-Benhamu, Ana Belen Ortega-Avila, Raquel García-De-La-Peña, Gabriel Gijon-Nogueron
BACKGROUND: Physical activity during childhood can be beneficial in the long term. However, this practice can influence the child's physiological development. The aim of this study was to determine whether the practice of soccer, in moderation, could be a risk factor for the inadequate development of the lower limb. METHODS: The study group was composed of 115 children, of whom 59 (mean age 8.03±0.89years) practised soccer 3 times a week and had a positive Physical Activity Questionnaire for Adolescents (PAQ-A) score, while a further 56 (mean age 7...
November 17, 2017: Foot
https://www.readbyqxmd.com/read/29410451/non-knee-spanning-muscles-contribute-to-tibiofemoral-shear-as-well-as-valgus-and-rotational-joint-reaction-moments-during-unanticipated-sidestep-cutting
#12
Nirav Maniar, Anthony G Schache, Prasanna Sritharan, David A Opar
Anterior cruciate ligament (ACL) injuries are a burdensome condition due to potential surgical requirements and increased risk of long term debilitation. Previous studies indicate that muscle forces play an important role in the development of ligamentous loading, yet these studies have typically used cadaveric models considering only the knee-spanning quadriceps, hamstrings and gastrocnemius muscle groups. Using a musculoskeletal modelling approach, we investigated how lower-limb muscles produce and oppose key tibiofemoral reaction forces and moments during the weight acceptance phase of unanticipated sidestep cutting...
February 6, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29406403/amputee-locomotion-joint-moment-adaptations-to-running-speed-using-running-specific-prostheses-after-unilateral-transtibial-amputation
#13
Brian S Baum, Hiroaki Hobara, Kyung Koh, Hyun Joon Kwon, Ross H Miller, Jae Kun Shim
OBJECTIVE: The objective of this study was to investigate 3D lower extremity joint moment differences between limbs and speed influences on these differences in individuals with lower extremity amputations using running-specific prostheses. DESIGN: 8 individuals with unilateral transtibial amputations and 8 control subjects with no amputations ran overground at three constant velocities (2.5, 3.0, and 3.5 m/s). A 2x2x3 (group x leg x speed) repeated-measures ANOVA with Bonferroni adjustments determined statistical significance...
February 5, 2018: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/29398995/preoperative-valgus-alignment-does-not-predict-inferior-outcome-of-total-knee-arthroplasty
#14
Cynthia A Kahlenberg, Myra Trivellas, Yuo-Yu Lee, Douglas E Padgett
Background: Preoperative valgus deformity is present in an estimated 10-20% of patients undergoing total knee replacement (TKR). Questions/Purposes: The objective of this study was to compare the Western Ontario and McMaster Universities Arthritis Index (WOMAC) scores after TKR in a matched cohort of patients with preoperative valgus and varus deformities. Methods: This is a matched cohort study of 162 patients with varus native knees and 162 patients with valgus native knees who underwent TKR and were prospectively followed in our institutional registry...
February 2018: HSS Journal: the Musculoskeletal Journal of Hospital for Special Surgery
https://www.readbyqxmd.com/read/29395747/a-preliminary-modeling-investigation-into-the-safe-correction-zone-for-high-tibial-osteotomy
#15
Jennifer Lb Martay, Antony Jr Palmer, Neil K Bangerter, Stuart Clare, A Paul Monk, Cameron P Brown, Andrew J Price
BACKGROUND: High tibial osteotomy (HTO) re-aligns the weight-bearing axis (WBA) of the lower limb. The surgery reduces medial load (reducing pain and slowing progression of cartilage damage) while avoiding overloading the lateral compartment. The optimal correction has not been established. This study investigated how different WBA re-alignments affected load distribution in the knee, to consider the optimal post-surgery re-alignment. METHODS: We collected motion analysis and seven Tesla MRI data from three healthy subjects, and combined this data to create sets of subject-specific finite element models (total=45 models)...
January 21, 2018: Knee
https://www.readbyqxmd.com/read/29394902/factors-influencing-postoperative-length-of-stay-in-an-enhanced-recovery-after-surgery-program-for-primary-total-knee-arthroplasty
#16
Shaoyun Zhang, Qiang Huang, Jinwei Xie, Bin Xu, Guorui Cao, Fuxing Pei
BACKGROUND: Hospital length of stay (LOS) after primary total knee arthroplasty (TKA) has decreased obviously following the implementation of enhanced recovery after surgery (ERAS) program in the last few years. However, there are still some patients that cannot be discharged at early time for a variety of reasons, and it is necessary to explore factors leading to prolonged LOS. Therefore, the purpose of this study was to identify the complete preoperative, perioperative, and postoperative factors associated with prolonged postoperative LOS (PLOS) after primary TKA in a detailed ERAS program...
February 2, 2018: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/29392383/intramedullary-nailing-in-opening-wedge-high-tibial-osteotomy-in-vitro-test-for-validation-of-a-method-of-fixation
#17
Rene Burchard, Denise Katerla, Marina Hammer, Anke Pahlkötter, Christian Soost, Gerhard Dietrich, Arne Ohrndorf, Wolfgang Richter, Markus Lengsfeld, Hans-Jürgen Christ, Jan Adriaan Graw, Claus-Peter Fritzen
PURPOSE: Opening wedge high tibial osteotomy (HTO) as a treatment in unicompartimental osteoarthritis of the knee can significantly relieve pain and prevent or at least delay an early joint replacement. The fixation of the osteotomy has undergone development and refinements during the last years. The angle-stable plate fixator is currently one of the most commonly used plates in HTOs. The angular stable fixation between screws and the plate offers a high primary stability to retain the correction with early weight-bearing protocols...
February 1, 2018: International Orthopaedics
https://www.readbyqxmd.com/read/29389790/femoral-component-varus-malposition-is-associated-with-tibial-aseptic-loosening-after-tka
#18
Bum-Sik Lee, Hyun-Ik Cho, Seong-Il Bin, Jong-Min Kim, Byeong-Kyu Jo
BACKGROUND: The notion that neutral alignment is mandatory to assure long-term durability after TKA has been based mostly on short-film studies. However, this is challenged by recent long-film studies. QUESTIONS/PURPOSES: We conducted this long-film study to know (1) whether the risk of aseptic revision for nontraumatic reasons was greater among knees with greater than 3° varus or valgus (defined as "outliers") than those that were aligned within 3° of neutral on long-standing mechanical axis (hip to knee) radiographs; and (2) what the failure mechanisms were and whether the malalignment was femoral or tibial in origin, or both, among those in the outlier group...
February 2018: Clinical Orthopaedics and related Research
https://www.readbyqxmd.com/read/29387448/association-between-frontal-plane-knee-control-and-lower-extremity-injuries-a-prospective-study-on-young-team-sport-athletes
#19
Anu M Räisänen, Kati Pasanen, Tron Krosshaug, Tommi Vasankari, Pekka Kannus, Ari Heinonen, Urho M Kujala, Janne Avela, Jarmo Perttunen, Jari Parkkari
Background/aim: Poor frontal plane knee control can manifest as increased dynamic knee valgus during athletic tasks. The purpose of this study was to investigate the association between frontal plane knee control and the risk of acute lower extremity injuries. In addition, we wanted to study if the single-leg squat (SLS) test can be used as a screening tool to identify athletes with an increased injury risk. Methods: A total of 306 basketball and floorball players participated in the baseline SLS test and a 12-month injury registration follow-up...
2018: BMJ Open Sport & Exercise Medicine
https://www.readbyqxmd.com/read/29387442/effects-of-an-8-week-strength-training-intervention-on-tibiofemoral-joint-loading-during-landing-a-cohort-study
#20
Maike B Czasche, Jon E Goodwin, Anthony M J Bull, Daniel J Cleather
Objectives: To use a musculoskeletal model of the lower limb to evaluate the effect of a strength training intervention on the muscle and joint contact forces experienced by untrained women during landing. Methods: Sixteen untrained women between 18 and 28 years participated in this cohort study, split equally between intervention and control groups. The intervention group trained for 8 weeks targeting improvements in posterior leg strength. The mechanics of bilateral and unilateral drop landings from a 30 cm platform were recorded preintervention and postintervention, as was the isometric strength of the lower limb during a hip extension test...
2018: BMJ Open Sport & Exercise Medicine
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