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American Journal of Sports Medicine

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https://www.readbyqxmd.com/read/30640523/comparison-of-undifferentiated-versus-chondrogenic-predifferentiated-mesenchymal-stem-cells-derived-from-human-umbilical-cord-blood-for-cartilage-repair-in-a-rat-model
#1
Yong-Beom Park, Chul-Won Ha, Jin-A Kim, Seongchan Kim, Yong-Geun Park
BACKGROUND: Human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) have gained much interest as a promising cell source for regenerative medicine owing to the noninvasive collection, availability, high expansion capacity, and low immunogenicity. However, few in vivo studies have reported the use of hUCB-MSCs on cartilage repair. Moreover, little study has been conducted on the effects of chondrogenic predifferentiation of hUCB-MSCs on cartilage repair. PURPOSE: To compare the effectiveness of transplanting undifferentiated versus chondrogenic predifferentiated mesenchymal stem cells (MSCs) for treating osteochondral defects...
January 14, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30640519/anatomic-features-of-the-tibial-plateau-predict-outcomes-of-acl-reconstruction-within-7-years-after-surgery
#2
Ata M Kiapour, Daniel S Yang, Gary J Badger, Naga Padmini Karamchedu, Martha M Murray, Paul D Fadale, Michael J Hulstyn, Robert M Shalvoy, Braden C Fleming
BACKGROUND: Multiple anatomic features of the femoral condyles and tibial plateau have been shown to influence knee biomechanics and risk of anterior cruciate ligament (ACL) injury. However, it remains unclear how these anatomic factors affect the midterm outcomes of ACL reconstruction. HYPOTHESIS: Decreased femoral notch width, increased posterior and coronal slopes, and decreased concavity of the tibial plateau are associated with inferior clinical, patient-reported, and osteoarthritis-related outcomes 7 years after ACL reconstruction...
January 14, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30640515/tibial-slope-and-its-effect-on-force-in-anterior-cruciate-ligament-grafts-anterior-cruciate-ligament-force-increases-linearly-as-posterior-tibial-slope-increases
#3
Andrew S Bernhardson, Zachary S Aman, Grant J Dornan, Bryson R Kemler, Hunter W Storaci, Alex W Brady, Gilberto Y Nakama, Robert F LaPrade
BACKGROUND: Previous work has reported that increased tibial slope is directly correlated with increased anterior tibial translation, possibly predisposing patients to higher rates of anterior cruciate ligament (ACL) tears and causing higher rates of ACL graft failures over the long term. However, the effect of changes in sagittal plane tibial slope on ACL reconstruction (ACLR) graft force has not been well defined. PURPOSE/HYPOTHESIS: The purpose of this study was to quantify the effect of changes in sagittal plane tibial slope on ACLR graft force at varying knee flexion angles...
January 14, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30640514/clinical-outcomes-of-isolated-revision-anterior-cruciate-ligament-reconstruction-or-in-combination-with-anatomic-anterolateral-ligament-reconstruction
#4
Dhong Won Lee, Jin Goo Kim, Seung Ik Cho, Du Han Kim
BACKGROUND: Although the cause of rotational instability after revision anterior cruciate ligament reconstruction (ACLR) is multifactorial, the rationale of adding an extra-articular procedure is based on its ability to restrict rotational instability. PURPOSE: To assess the effect of anterolateral ligament (ALL) reconstruction on revision ACLR. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: A total of 87 patients who underwent revision ACLR between March 2011 and July 2014 with a follow-up of more than 3 years were included in this retrospective study...
January 14, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30640513/challenging-the-current-concept-of-critical-glenoid-bone-loss-in-shoulder-instability-does-the-size-measurement-really-tell-it-all
#5
Philipp Moroder, Philipp Damm, Guido Wierer, Elisabeth Böhm, Marvin Minkus, Fabian Plachel, Sven Märdian, Markus Scheibel, Mohammad Khatamirad
BACKGROUND: Bone loss at the anterior glenoid rim is a main reason for failure of soft-tissue based surgical stabilization procedures in patients with anterior shoulder instability. PURPOSE: To evaluate the capability of conventional glenoid bone loss measurement techniques to provide an adequate estimation of the actual biomechanical effect of glenoid defects. STUDY DESIGN: Descriptive laboratory study. METHODS: Thirty consecutive patients with unilateral anterior shoulder instability and varying degrees of glenoid defect were included...
January 14, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30640507/posterior-tibial-slope-and-risk-of-posterior-cruciate-ligament-injury
#6
Andrew S Bernhardson, Nicholas N DePhillipo, Blake T Daney, Mitchell I Kennedy, Zachary S Aman, Robert F LaPrade
BACKGROUND: Recent biomechanical studies have identified sagittal plane posterior tibial slope as a potential risk factor for posterior cruciate ligament (PCL) injury because of its effects on the kinematics of the native and surgically treated knee. However, the literature lacks clinical correlation between primary PCL injuries and decreased posterior tibial slope. PURPOSE/HYPOTHESIS: The purpose of this study was to retrospectively compare the amount of posterior tibial slope between patients with PCL injuries and age/sex-matched controls with intact PCLs...
January 14, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30640506/short-term-changes-after-corticosteroid-injections-into-the-normal-tendons-of-rabbits-a-controlled-randomized-study
#7
Kandir Genesio Innocenti Dinhane, Alexandre Leme Godoy-Santos, Alexandre Todorovic Fabro, Maria Regina Moretto, Igor Deprá, Winston Bonetti Yoshida
BACKGROUND: Corticosteroid injections in or around tendons for the treatment of athletic injuries are a common practice among orthopaedic surgeons and are apparently efficacious in the short term, although controversies persist related to local complications. PURPOSE: This study evaluated short-term (48 hours) biomechanical, biochemical, and histological alterations after a single injection of betamethasone into the normal tendons of rabbits. STUDY DESIGN: Controlled laboratory study...
January 14, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30629459/delamination-does-not-affect-outcomes-after-arthroscopic-rotator-cuff-repair-as-compared-with-nondelaminated-rotator-cuff-tears-a-study-of-1043-consecutive-cases
#8
Jieun Kwon, Ye Hyun Lee, Sae Hoon Kim, Jung Hoon Ko, Byung Kyu Park, Joo Han Oh
BACKGROUND: Limited information is available regarding the characteristics of delaminated rotator cuff tears as compared with nondelaminated tears. Furthermore, there is conflicting information regarding the effects of delamination on the anatomic healing of repaired cuffs. PURPOSE: To evaluate the characteristics and anatomic outcomes of delaminated rotator cuff tears in comparison with nondelaminated tears to determine whether delamination is a negative prognostic factor affecting rotator cuff repair outcomes...
January 10, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30625277/effects-of-estrogen-deficient-state-on-rotator-cuff-healing
#9
Koji Tanaka, Tomonoshin Kanazawa, Masafumi Gotoh, Ryo Tanesue, Hidehiro Nakamura, Hiroki Ohzono, Takahiro Okawa, Naoto Shiba
BACKGROUND: Rotator cuff retears after surgical repair are a concern, despite advances in operative techniques, but few studies have investigated the effects of the estrogen-deficient state on tendon-to-bone healing at the repair site. PURPOSE: We evaluated the effect of the estrogen-deficient state on tendon-to-bone healing after rotator cuff repair in an ovariectomized rat model. STUDY DESIGN: Controlled laboratory study. METHODS: Female Sprague Dawley rats underwent detachment and immediate repair of the supraspinatus tendon...
January 9, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30624979/osteochondral-autograft-transplantation-technique-augmented-by-an-ultrapurified-alginate-gel-enhances-osteochondral-repair-in-a-rabbit-model
#10
Ryosuke Hishimura, Tomohiro Onodera, Kazutoshi Hontani, Rikiya Baba, Kentaro Homan, Shinji Matsubara, Zenta Joutoku, WooYoung Kim, Takayuki Nonoyama, Takayuki Kurokawa, Jian Ping Gong, Norimasa Iwasaki
BACKGROUND: One of the most important limitations of osteochondral autograft transplantation (OAT) is the adverse effect on donor sites in the knee. To decrease the number and/or size of osteochondral defects, we devised a method with biomaterial implantation after OAT. HYPOTHESIS: OAT augmented by ultrapurified alginate (UPAL) gel enhances cartilage repair capacity. STUDY DESIGN: Controlled laboratory study. METHODS: Seventy-five osteochondral defects in rabbits were divided into 3 groups: osteochondral defects with OAT alone, defects with OAT augmented by UPAL gel (combined group), and defects without intervention as controls...
January 9, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30624961/delayed-acl-reconstruction-in-patients-%C3%A2-40-years-of-age-is-associated-with-increased-risk-of-medial-meniscal-injury-at-1-year
#11
Jonathan A Stone, Gabriel S Perrone, Teron A Nezwek, Qingping Cui, Steven C Vlad, John C Richmond, Matthew J Salzler
BACKGROUND: Anterior cruciate ligament (ACL) tears in the pediatric and young adult ACL-deficient knee are often associated with meniscal or chondral injury with delayed time to surgery. The incidence of ACL reconstruction performed in patients aged ≥40 years is rising, and it is unclear if delayed surgery in this cohort similarly affects the health of the meniscus and cartilage. PURPOSE: To evaluate whether delayed reconstruction in a cohort of patients aged ≥40 years is associated with an increased risk of meniscal or chondral injury...
January 9, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30624958/major-league-baseball-pitching-performance-after-tommy-john-surgery-and-the-effect-of-tear-characteristics-technique-and-graft-type
#12
Nathan E Marshall, Robert Keller, Orr Limpisvasti, Brian Schulz, Neal ElAttrache
BACKGROUND: Return to play and player satisfaction have been quite high after ulnar collateral ligament reconstruction (UCLR); however, there has been little reported on how outcomes are affected by surgical technique, graft type, and tear characteristics. PURPOSE: To evaluate surgical techniques, graft type, and tear characteristics on Major League Baseball (MLB) performance after UCLR. STUDY DESIGN: Cohort study; Level of evidence, 2. METHODS: MLB pitchers who underwent primary UCLR at a single institution were included...
January 9, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30624953/biomechanical-comparison-of-3-novel-repair-techniques-for-radial-tears-of-the-medial-meniscus-the-2-tunnel-transtibial-technique-a-hybrid-horizontal-and-vertical-mattress-suture-configuration-and-a-combined-hybrid-tunnel-technique
#13
Patrick S Buckley, Bryson R Kemler, Colin M Robbins, Zachary S Aman, Hunter W Storaci, Grant J Dornan, Robert F LaPrade
BACKGROUND: Historically, radial meniscal tears were treated with partial or near-total meniscectomy, which usually resulted in poor outcomes. Radial meniscal tears function similar to a total meniscectomy and are challenging to treat. Repair of radial meniscal tears should be performed to prevent joint deterioration and the need for salvage procedures in the future. PURPOSE/HYPOTHESIS: The purpose was to compare 3 repair techniques for radial tears of the medial meniscus: the 2-tunnel, hybrid, and hybrid tunnel techniques...
January 9, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30608864/responsiveness-and-minimal-important-change-of-the-ikdc-of-middle-aged-and-older-patients-with-a-meniscal-tear
#14
Julia C A Noorduyn, Victor A van de Graaf, Lidwine B Mokkink, Nienke W Willigenburg, Rudolf W Poolman, Vanessa A B Scholtes, Ise Butter, Eduard L A R Mutsaerts, Julius Wolkenfelt, Matthijs R Krijnen, Derek F P van Deurzen, Dirk Jan F Moojen, Coen H Bloembergen, Olivier J F Nijland, Arthur de Gast, Thom Snijders, Jelle J Halma, Daniel B F Saris, Nienke Wolterbeek, Camille Neeter, Gino M M J Kerkhoffs, Rolf W Peters, Igor C J B van den Brand, Suzanne de Vos-Jakobs, Andy B Spoor, Taco Gosens, Wahid Rezaie, Dirk Jan Hofstee, Bart J Burger, Daniel Haverkamp, Anton M J S Vervest, Thijs A van Rheenen, Anne E Wijsbek, Ewoud R A van Arkel, Bregje J W Thomassen, Sheila Sprague, Ben Willem J Mol, Maurits W van Tulder
BACKGROUND: Responsiveness and the minimal important change (MIC) are important measurement properties to evaluate treatment effects and to interpret clinical trial results. The International Knee Documentation Committee (IKDC) Subjective Knee Form is a reliable and valid instrument for measuring patient-reported knee-specific symptoms, functioning, and sports activities in a population with meniscal tears. However, evidence on responsiveness is of limited methodological quality, and the MIC has not yet been established for patients with symptomatic meniscal tears...
January 4, 2019: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30597124/outcomes-with-a-focus-on-return-to-play-for-revision-ulnar-collateral-ligament-surgery-among-elite-level-baseball-players-a-systematic-review
#15
Georgina Glogovac, Brian M Grawe
BACKGROUND: Ulnar collateral ligament (UCL) reconstruction is commonly performed among overhead throwing athletes. Previous studies demonstrated relatively high rates of return to sport after primary reconstruction. Outcomes after revision UCL reconstruction have not been widely studied. PURPOSE: To report the rate of return to sport after revision UCL reconstruction among elite-level baseball players. STUDY DESIGN: Systematic review. METHODS: A systematic review of the literature following the PRISMA (Preferred Reporting Items for Systematic Meta-Analyses) guidelines was performed for high-level baseball players undergoing revision UCL reconstruction...
December 31, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30597120/effects-of-ultra-purified-alginate-gel-implantation-on-meniscal-defects-in-rabbits
#16
WooYoung Kim, Tomohiro Onodera, Eiji Kondo, Yasuyuki Kawaguchi, Mohamad Alaa Terkawi, Rikiya Baba, Kazutoshi Hontani, Zenta Joutoku, Shinji Matsubara, Kentaro Homan, Ryosuke Hishimura, Norimasa Iwasaki
BACKGROUND: Many tissue-engineered methods for meniscal repair have been studied, but their utility remains unclear. HYPOTHESIS: Implantation of low-endotoxin, ultra-purified alginate (UPAL) gel without cells could induce fibrocartilage regeneration on meniscal defects in rabbits. STUDY DESIGN: Controlled laboratory study. METHODS: Forty-two mature Japanese White rabbits were divided into 2 groups of 21 animals each...
December 31, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30596529/hip-joint-torsional-loading-before-and-after-cam-femoroacetabular-impingement-surgery
#17
K C Geoffrey Ng, Hadi El Daou, Marcus J K Bankes, Ferdinando Rodriguez Y Baena, Jonathan R T Jeffers
BACKGROUND: Surgical management of cam femoroacetabular impingement (FAI) aims to preserve the native hip and restore joint function, although it is unclear how the capsulotomy, cam deformity, and capsular repair influence joint mechanics to balance functional mobility. PURPOSE: To examine the contributions of the capsule and cam deformity to hip joint mechanics. Using in vitro, cadaveric methods, we examined the individual effects of the surgical capsulotomy, cam resection, and capsular repair on passive range of motion and resistance of applied torque...
December 31, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30596519/superior-capsule-reconstruction-for-reinforcement-of-arthroscopic-rotator-cuff-repair-improves-cuff-integrity
#18
Teruhisa Mihata, Thay Q Lee, Akihiko Hasegawa, Kunimoto Fukunishi, Takeshi Kawakami, Yukitaka Fujisawa, Mutsumi Ohue, Munekazu Doi, Masashi Neo
BACKGROUND: Retear of repaired rotator cuff tendons worsens patient outcome and decreases patient satisfaction. Superior capsule reconstruction (SCR) was developed to center the humeral head and thus restore the force couple for patients with rotator cuff tears. PURPOSE: To evaluate whether SCR for reinforcement before arthroscopic rotator cuff repair (ARCR) improves cuff integrity. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Thirty-four consecutive patients (mean age, 69...
December 31, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30596511/comparison-of-clinical-and-radiographic-outcomes-of-vertical-simple-stitch-versus-modified-mason-allen-stitch-in-arthroscopic-bankart-repairs-a-prospective-randomized-controlled-study
#19
Jin-Young Park, Seok Won Chung, Jong Soo Lee, Kyung-Soo Oh, Jae-Hyung Lee
BACKGROUND: In spite of the probable advantages of Bankart repair with modified Mason-Allen technique, there has been no study to evaluate the clinical outcomes of the modified Mason-Allen technique for Bankart repair. PURPOSE: To prospectively compare the anatomic and clinical outcomes between the vertical simple stitch and the modified Mason-Allen stitch with respect to the labral height, retear rate, redislocation/apprehension, and various functional outcome scores...
December 31, 2018: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/30571140/effect-of-penalty-minute-rule-change-on-injuries-and-game-disqualification-penalties-in-high-school-ice-hockey
#20
Peter K Kriz, Steven J Staffa, David Zurakowski, Matthew MacAskill, Tyler Kirchberg, Kyle Robert, Janette Baird, Greg Lockhart
BACKGROUND: Recent efforts have focused on eliminating dangerous hits in ice hockey. Fair play rule changes have successfully reduced injury risk but have not been widely implemented. PURPOSE: To determine the effect of a penalty infraction minutes (PIM) rule change in high school boys' ice hockey on injuries and game disqualification penalties. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Injury data were collected from 2 Rhode Island hospital systems and game/penalty data through the Rhode Island Hockey Coaches Association website...
December 20, 2018: American Journal of Sports Medicine
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