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American Journal of Sports Medicine

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https://www.readbyqxmd.com/read/28319431/evaluation-of-the-risk-factors-for-a-rotator-cuff-retear-after-repair-surgery
#1
Yeong Seok Lee, Jeung Yeol Jeong, Chan-Deok Park, Seung Gyoon Kang, Jae Chul Yoo
BACKGROUND: A retear is a significant clinical problem after rotator cuff repair. However, no study has evaluated the retear rate with regard to the extent of footprint coverage. PURPOSE: To evaluate the preoperative and intraoperative factors for a retear after rotator cuff repair, and to confirm the relationship with the extent of footprint coverage. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Data were retrospectively collected from 693 patients who underwent arthroscopic rotator cuff repair between January 2006 and December 2014...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28319426/high-satisfaction-and-return-to-sports-after-total-shoulder-arthroplasty-in-patients-aged-55-years-and-younger
#2
Grant H Garcia, Joseph N Liu, Alec Sinatro, Hao-Hua Wu, Joshua S Dines, Russell F Warren, David M Dines, Lawrence V Gulotta
BACKGROUND: Young, active candidates for total shoulder arthroplasty (TSA) are a unique group of patients. Not only do they demand longevity and improved function, but they also desire a return to physical activities. PURPOSE: To determine the rate of return to sports in patients aged ≤55 years undergoing TSA. STUDY DESIGN: Case series; Level of evidence, 4. METHODS: This was a retrospective review of consecutive patients who underwent anatomic TSA at a single institution...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28319418/autologous-cartilage-chip-transplantation-improves-repair-tissue-composition-compared-with-marrow-stimulation
#3
Bjørn Borsøe Christensen, Morten Lykke Olesen, Martin Lind, Casper Bindzus Foldager
BACKGROUND: Repair of chondral injuries by use of cartilage chips has recently demonstrated clinical feasibility. PURPOSE: To investigate in vivo cartilage repair outcome of autologous cartilage chips compared with marrow stimulation in full-thickness cartilage defects in a minipig model. STUDY DESIGN: Controlled laboratory study. METHODS: Six Göttingen minipigs received two 6-mm chondral defects in the medial and lateral trochlea of each knee...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28318302/isolated-subscapularis-repair-in-irreparable-posterosuperior-massive-rotator-cuff-tears-involving-the-subscapularis-tendon
#4
Sung-Jae Kim, Yun-Rak Choi, Min Jung, Won-Yong Lee, Yong-Min Chun
BACKGROUND: No previous study has examined whether isolated subscapularis tendon repair in irreparable posterosuperior massive rotator tears involving the subscapularis tendon in relatively young patients without arthritis can yield satisfactory outcomes. HYPOTHESIS: We hypothesized that this procedure would produce favorable outcomes in patients who might otherwise be candidates for reverse arthroplasty. STUDY DESIGN: Case series; Level of evidence, 4...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28314107/graft-site-morbidity-in-elbow-ligament-reconstruction-procedures-a-systematic-review
#5
Noortje C Hagemeijer, Femke M A P Claessen, Roel de Haan, Roeland Riedijk, Denise E Eygendaal, Michel P van den Bekerom
BACKGROUND: It is unclear which tendon harvest for ulnar or lateral collateral ligament reconstruction has the lowest graft site morbidity rate. PURPOSES: To obtain graft site morbidity rates after tendon harvest for ulnar and lateral collateral ligament reconstruction procedures. STUDY DESIGN: Systematic review/Meta-analysis. METHODS: Studies were eligible if (1) patients had undergone elbow ligament reconstruction procedures; (2) original data for at least 5 patients were available; (3) the article was written in English, German, or Dutch; (4) a full-text article was available; and (5) information about graft site morbidity was available...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28301224/increased-risk-of-revision-after-anterior-cruciate-ligament-reconstruction-with-soft-tissue-allografts-compared-with-autografts-graft-processing-and-time-make-a-difference
#6
Gregory B Maletis, Jason Chen, Maria C S Inacio, Rebecca M Love, Tadashi T Funahashi
BACKGROUND: The optimal graft for anterior cruciate ligament reconstruction (ACLR) remains controversial. PURPOSE: To compare the risk of aseptic revision between bone-patellar tendon-bone (BPTB) autografts, hamstring autografts, and soft tissue allografts. STUDY DESIGN: Cohort study; Level of evidence, 2. METHODS: Prospectively collected ACLR cases reconstructed with BPTB autografts, hamstring autografts, and soft tissue allografts were identified using the Kaiser Permanente ACLR Registry...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28301205/intratendon-delivery-of-leukocyte-poor-platelet-rich-plasma-improves-healing-compared-with-leukocyte-rich-platelet-rich-plasma-in-a-rabbit-achilles-tendinopathy-model
#7
Ruijian Yan, Yanjia Gu, Jisheng Ran, Yejun Hu, Zefeng Zheng, Mengfeng Zeng, Boonchin Heng, Xiao Chen, Zi Yin, Weishan Chen, Weiliang Shen, Hongwei Ouyang
BACKGROUND: Chronic tendinopathy is a commonly occurring clinical problem that affects both athletes and inactive middle-aged patients. Although some studies have shown that different platelet-rich plasma (PRP) preparations could exert various therapeutic effects in vitro, the role of leukocytes in PRP has not yet been defined under tendinopathy conditions in vivo. PURPOSE: This study compared the effects of the intratendon delivery of leukocyte-poor PRP (Lp-PRP) versus leukocyte-rich PRP (Lr-PRP) in a rabbit chronic tendinopathy model in vivo...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28298067/incidence-of-second-anterior-cruciate-ligament-tears-1990-2000-and-associated-factors-by-geographic-locale
#8
Nathan D Schilaty, Nathaniel A Bates, Thomas L Sanders, Aaron J Krych, Michael J Stuart, Timothy E Hewett
BACKGROUND: Second anterior cruciate ligament (ACL) tears after reconstruction occur at a reported rate of 20% to 30%. This high frequency indicates that there may be factors that predispose an athlete to graft failure and ACL tears of the contralateral knee. PURPOSE: To determine the incidence of second ACL injuries in a geographic population-based cohort over a 10-year observation period. STUDY DESIGN: Descriptive epidemiological study. METHODS: International Classification of Diseases, 9th Revision (ICD-9) codes relevant to the diagnosis of an ACL tear and the procedure code for ACL reconstruction were searched across the Rochester Epidemiology Project, a multidisciplinary county database, between the years of 1990 and 2000...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28298066/effect-of-fatigue-protocols-on-lower-limb-neuromuscular-function-and-implications-for-anterior-cruciate-ligament-injury-prevention-training
#9
Sue D Barber-Westin, Frank R Noyes
BACKGROUND: Approximately two-thirds of anterior cruciate ligament (ACL) tears are sustained during noncontact situations when an athlete is cutting, pivoting, decelerating, or landing from a jump. Some investigators have postulated that fatigue may result in deleterious alterations in lower limb biomechanics during these activities that could increase the risk of noncontact ACL injuries. However, prior studies have noted a wide variation in fatigue protocols, athletic tasks studied, and effects of fatigue on lower limb kinetics and kinematics...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28297618/hip-arthroscopy-for-atypical-posterior-hip-pain-a-comparative-matched-pair-analysis
#10
David M Levy, Gregory L Cvetanovich, Benjamin D Kuhns, Mitchell J Greenberg, Jennifer M Alter, Shane J Nho
BACKGROUND: Femoroacetabular impingement (FAI) most commonly manifests as anterior groin pain. Patients occasionally have posterior pain but otherwise have clinical and radiographic evidence of FAI. PURPOSE: To compare outcomes of hip arthroscopy for FAI in patients with atypical posterior pain versus a matched group with the typical anterior pain presentation. STUDY DESIGN: Cohort study; Level of evidence, 3. METHODS: Patients undergoing primary hip arthroscopy for FAI were identified from a clinical repository between January 2012 and 2014...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28297604/biomechanical-evaluation-of-classic-solid-and-all-soft-suture-anchors-for-medial-patellofemoral-ligament-reconstruction
#11
Michael G Saper, Karim Meijer, Scott Winnier, John Popovich, James R Andrews, Charles Roth
BACKGROUND: Multiple techniques for patellar fixation with classic solid suture anchors (SAs) in medial patellofemoral ligament (MPFL) reconstruction have been described. Fixation of the graft to the patella with all-soft suture anchors (ASAs) has not been studied. Purpose/Hypothesis: To evaluate the biomechanical performance of 2 different MPFL patellar fixation techniques: ASA fixation and SA fixation. We hypothesized that the ASA group would show no statistical difference in the ultimate failure load and stiffness compared with the SA group...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28296429/factors-that-predict-failure-in-anatomic-single-bundle-anterior-cruciate-ligament-reconstruction
#12
Ben Parkinson, Curtis Robb, Michael Thomas, Peter Thompson, Tim Spalding
BACKGROUND: Anatomic graft placement in anterior cruciate ligament (ACL) reconstruction has become the preferred technique for many surgeons. The predictive factors for graft failure in anatomic single-bundle ACL reconstruction are relatively unknown. PURPOSE: To determine the risk factors for graft failure and the relative importance of those factors in anatomic single-bundle ACL reconstruction. STUDY DESIGN: Case-control study; Level of evidence, 3...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28291955/change-of-chondral-lesions-and-predictive-factors-after-medial-open-wedge-high-tibial-osteotomy-with-a-locked-plate-system
#13
Kang-Il Kim, Min-Chul Seo, Sang-Jun Song, Dae-Kyung Bae, Duk-Hyun Kim, Sang Hak Lee
BACKGROUND: Although cartilage regeneration after medial open-wedge high tibial osteotomy (HTO) has been described, there is a paucity of reports regarding which factors influence cartilage regeneration. PURPOSE: To document whether cartilage regeneration occurs in the previously degenerated medial compartment of arthritic knees after medial open-wedge HTO without concomitant cartilage procedures and to assess which predictive factors influence regeneration after HTO...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28291954/therapeutic-mechanisms-of-human-adipose-derived-mesenchymal-stem-cells-in-a-rat-tendon-injury-model
#14
Sang Yoon Lee, Bomi Kwon, Kyoungbun Lee, Young Hoon Son, Sun G Chung
BACKGROUND: Although survival of transplanted stem cells in vivo and differentiation of stem cells into tenocytes in vitro have been reported, there have been no in vivo studies demonstrating that mesenchymal stem cells (MSCs) could secrete their own proteins as differentiated tenogenic cells. Purpose/Hypothesis: Using a xenogeneic MSC transplantation model, we aimed to investigate whether MSCs could differentiate into the tenogenic lineage and secrete their own proteins. The hypothesis was that human MSCs would differentiate into the human tenogenic lineage and the cells would be able to secrete human-specific proteins in a rat tendon injury model...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28291948/eccentric-training-for-tendon-healing-after-acute-lesion-a-rat-model
#15
Jean-François Kaux, Vincent Libertiaux, Pierre Leprince, Marianne Fillet, Vincent Denoel, Clémence Wyss, Christelle Lecut, André Gothot, Caroline Le Goff, Jean-Louis Croisier, Jean-Michel Crielaard, Pierre Drion
BACKGROUND: The tendon is a dynamic entity that remodels permanently. Platelet-rich plasma (PRP) injection has been shown to have a beneficial effect on tendon healing after lesion in rats. Furthermore, eccentric exercise seems to improve the mechanical quality of the tendon. HYPOTHESIS: A combination of PRP injection and eccentric training might be more effective than either treatment alone. STUDY DESIGN: Controlled laboratory study. METHODS: Adult male rats were anesthetized, an incision was performed in the middle of their left patellar tendon and an injection of physiological fluid (PF) or homologous PRP was randomly made at the lesion level...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28288281/the-association-of-sport-specialization-and-training-volume-with-injury-history-in-youth-athletes
#16
Eric G Post, Stephanie M Trigsted, Jeremy W Riekena, Scott Hetzel, Timothy A McGuine, M Alison Brooks, David R Bell
BACKGROUND: Recommendations exist to encourage safe youth participation in sport. These recommendations include not specializing in 1 sport, limiting participation to less than 8 months per year, and limiting participation to fewer hours per week than a child's age. However, limited evidence exists to support or refute these recommendations. HYPOTHESIS: High levels of specialization will be associated with a history of injuries and especially overuse injuries, independent of age, sex, or weekly sport training hours...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28288280/early-versus-delayed-motion-after-rotator-cuff-repair
#17
Darby A Houck, Matthew J Kraeutler, Hayden B Schuette, Eric C McCarty, Jonathan T Bravman
BACKGROUND: Previous meta-analyses have been conducted to compare outcomes of early versus delayed motion after rotator cuff repair. PURPOSE: To conduct a systematic review of overlapping meta-analyses comparing early versus delayed motion rehabilitation protocols after rotator cuff repair to determine which meta-analyses provide the best available evidence. STUDY DESIGN: Systematic review. METHODS: A systematic review was performed by searching PubMed and Cochrane Library databases...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28282504/soleus-atrophy-is-common-after-the-nonsurgical-treatment-of-acute-achilles-tendon-ruptures
#18
Juuso Heikkinen, Iikka Lantto, Tapio Flinkkila, Pasi Ohtonen, Jaakko Niinimaki, Pertti Siira, Vesa Laine, Juhana Leppilahti
BACKGROUND: It remains controversial whether nonsurgical or surgical treatment provides better calf muscle strength recovery after an acute Achilles tendon rupture (ATR). Recent evidence has suggested that surgery might surpass nonsurgical treatment in restoring strength after an ATR. PURPOSE: To assess whether magnetic resonance imaging (MRI) findings could explain calf muscle strength deficits and the difference between nonsurgical and surgical treatments in restoring calf muscle strength...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28282498/risk-factors-for-revision-surgery-after-superior-labral-anterior-posterior-repair
#19
Samuel A Taylor, Ryan M Degen, Alexander E White, Moira M McCarthy, Lawrence V Gulotta, Stephen J O'Brien, Brian C Werner
BACKGROUND: Data regarding risk factors for revision surgery after superior labral anterior-posterior (SLAP) repair are limited to institutional series. PURPOSE: To define risk factors for revision surgery after SLAP repair among patients in a large national database. STUDY DESIGN: Case-control study; Level of evidence, 3. METHODS: A national insurance database was queried for patients undergoing arthroscopic SLAP repair (Current Procedural Terminology [CPT] code 29807) for the diagnosis of a SLAP tear...
March 1, 2017: American Journal of Sports Medicine
https://www.readbyqxmd.com/read/28282242/influence-of-the-injury-to-surgery-interval-on-the-healing-potential-of-human-anterior-cruciate-ligament-derived-cells
#20
Takao Inokuchi, Tomoyuki Matsumoto, Koji Takayama, Naoki Nakano, Shurong Zhang, Daisuke Araki, Takehiko Matsushita, Ryosuke Kuroda
BACKGROUND: Vascular CD34+ cells in anterior cruciate ligament (ACL) tissue have the potential for high proliferation and multilineage differentiation that can accelerate tendon-bone healing. While patient characteristics, such as age, can affect tendon-bone healing, the influence of elapsed time after injury on the healing process is unclear. HYPOTHESIS: Cells obtained during the early phase after injury will exhibit a greater tendon-bone healing potential compared with chronic phase counterparts when applied to an immunodeficient rat model of ACL reconstruction...
March 1, 2017: American Journal of Sports Medicine
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