Radial Width of the Lateral Meniscus at the Popliteal Hiatus: Relevance to Saucerization of Discoid Lateral Menisci

2021 ◽  
pp. 036354652110566
Author(s):  
Jamison G. Gamble ◽  
Abdalla B. Abdalla ◽  
Molly G. Meadows ◽  
Thomas Rauer ◽  
Charles M. Chan ◽  
...  
Keyword(s):  
Null Hypothesis ◽  
Pain Treatment ◽  
Lateral Meniscus ◽  
Cross Sectional Study ◽  
Discoid Lateral Meniscus ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Average Width ◽  
Collagenous Tissue ◽  
Direct Measurements

Background: A discoid lateral meniscus (DLM) is a congenital anomaly of the knee in which the lateral meniscus has an “O” shape and contains irregular, abnormal collagenous tissue. A DLM can cause mechanical symptoms and pain. Treatment of a symptomatic DLM is arthroscopic saucerization to reshape the meniscus to a more normal contour. Enough tissue must be removed to eliminate mechanical symptoms but not too much to create instability. The residual width of the meniscus is crucial at the popliteus hiatus because here the peripheral rim is unattached at the capsule. Reports in the literature recommend a residual width of 6 to 8 mm. Purpose/Hypothesis: The purpose of this research was to determine the width of the lateral meniscus at the popliteal hiatus in normal specimens. Our null hypothesis was that a residual width of 6 to 8 mm will be sufficient to approximate normal anatomy. Study Design: Cross-sectional study; Level of evidence, 3. Methods: We made direct measurements of the radial width of the lateral meniscus from the outer rim at the popliteal hiatus to the inner edge in 19 specimens (age, 2-120 months.) We measured one 4-year-old specimen with a bilateral complete DLM. We also measured 39 digital images of specimens (age, 1-132 months) using ImageJ. Finally, we made direct arthroscopic measurements of 8 skeletally mature specimens. Results: The average width of specimens <3 years old was 5.5 mm. The average width of the 10-year-old specimens was 12 mm. The average width of the skeletally mature specimens was 16 mm. A 4-year-old DLM specimen measured 19 mm. Conclusion: We rejected our null hypothesis. Direct measurements suggest that a residual width of 6 to 8 mm is insufficient for children ≥8 years old. A width of at least a full centimeter approximates the normal for 8-year-olds and at least 15 mm for adolescents.

scholarly journals LATERAL MENISCUS WIDTH AT THE POPLITEUS RECESS AND THE RELEVANCE TO SAUCERIZATION OF DISCOID LATERAL MENISCI

2020 ◽  
Vol 8 (4_suppl3) ◽  
pp. 2325967120S0022
Author(s):  
Jamison G. Gamble ◽  
Abdalla B. Abdalla ◽  
Molly Meadows ◽  
Thomas Rauer ◽  
Charles M. Chan ◽  
...  
Keyword(s):  
Null Hypothesis ◽  
Pain Treatment ◽  
Lateral Meniscus ◽  
Discoid Lateral Meniscus ◽  
Average Width ◽  
Direct Measurements ◽  
Text Figure ◽  
Arthroscopic Meniscectomy ◽  
Relationship Of ◽  
The Relationship

Background: Discoid lateral meniscus (DLM) is a congenital anomaly of the knee where the normally “O” shaped lateral meniscus has redundant tissue filling the “O” and covering the lateral tibial plateau. The redundant tissue can cause mechanical symptoms and pain. Treatment of symptomatic DLM is arthroscopic saucerization to reshape the meniscus to a more normal contour. Enough tissue must be removed to eliminate mechanical symptoms but not too much as to create instability. The residual width of the meniscus is crucial at the popliteus hiatus because here the peripheral rim is unattached to the capsule. The literature recommends a residual width of 6-8 mm.1,2 Purpose/Hypothesis: The primary purpose of this research is to determine the width of the meniscus at the popliteal hiatus in normal specimens. Our null hypothesis is that a residual width of 6-8 millimeters will be sufficient for saucerization of DLM. Methods: We made direct measurements of lateral meniscus radial width from the outer rim at the popliteus hiatus to the inner edge (Figure 1) in 19 specimens (ages 2 months to 120 months.) We measured one four-year-old specimen with bilateral complete DLM. We also measured 39 digital images of specimens (ages 1 month to 132 months) using ImageJ. Finally, we made direct measurements of 8 skeletally mature specimens. Results: Figure 2 shows the relationship of meniscus width as a function age. The average width of specimens <3-years-old was 5.5mm. The average width of the ten-year-old specimens was 12mm. The average width of the skeletally mature specimens was 16mm. The four-year-old DLM specimen measured 19 mm. Conclusions: We rejected our null hypothesis. Direct measurements suggest that a residual width of 6-8mm is insufficient for children 8-years and older. A width of at least a full centimeter more closely approximates our findings, and for adolescents consider a residual rim of 15 mm. For children less than six-years-old a residual width of 6-8mm is sufficient. References: Kocher MS, Logan CA, Kramer DE. Discoid lateral meniscus in children: diagnosis, management, and outcomes. J Am Acad Orthop Surg 2017;25:736-743. Hayashi LK, Yamaga H, Ida K, Miura T. Arthroscopic meniscectomy for discoid lateral meniscus in children. J Bone Joint Surg. 1988;70-A: 1495-1500. [Figure: see text][Figure: see text]

scholarly journals SAUCERIZATION OF DISCOID LATERAL MENISCI. HOW MUCH RESIDUAL WIDTH IS RIGHT?

2020 ◽  
Vol 8 (7_suppl6) ◽  
pp. 2325967120S0044
Author(s):  
Abdalla Abdalla ◽  
Molly Meadows ◽  
Thomas Rauer ◽  
Charles Chan ◽  
Theodore Ganley ◽  
...  
Keyword(s):  
Null Hypothesis ◽  
Tibial Plateau ◽  
Pain Treatment ◽  
Lateral Meniscus ◽  
Discoid Lateral Meniscus ◽  
Lateral Tibial Plateau ◽  
Average Width ◽  
Direct Measurements ◽  
Relationship Of ◽  
The Relationship

Objectives: Discoid lateral meniscus (DLM) is a congenital anomaly of the knee where the normally “O” shaped lateral meniscus has redundant tissue filling the “O” and covering the lateral tibial plateau. The redundant tissue can degenerate and cause mechanical symptoms and pain. Treatment of symptomatic DLM is arthroscopic saucerization to reshape the meniscus to a more normal contour. Enough tissue must be removed to eliminate mechanical symptoms but not too much as to create instability. The residual width of the meniscus is crucial at the popliteus hiatus because here the peripheral rim is unattached to the capsule. The literature recommends a residual width of 6-8 mm. The primary purpose of this research was to determine the width of the meniscus at the popliteal hiatus in normal specimens. Our null hypothesis was that a residual width of 6-8 millimeters will be sufficient for saucerization of DLM. Methods: We made direct measurements of lateral meniscus radial width from the outer rim at the popliteus hiatus to the inner edge (Figure 1) in 19 specimens (ages 2 months to 11 years.) We measured one four-year-old specimen with bilateral complete DLM (Figure 2.) We also measured 39 digital images of specimens (ages 1-month to 12-years) using ImageJ. Finally, we made direct measurements of 8 skeletally mature specimens. Results: Figure 3 shows the relationship of meniscus width as a function age. The average width of specimens <3-years-old was 5.5mm. The average width of the ten-year-old specimens was 12mm. The average width of the skeletally mature specimens was 16mm. The four-year-old DLM specimen measured 19 mm. Conclusions: We rejected our null hypothesis. Direct measurements suggest that a residual width of 6-8mm is insufficient for children 8-years and older. A width of at least a full centimeter more closely approximates our findings, and for adolescents consider a residual rim of 15 mm. For children less than six-years-old a residual width of 6-8mm is sufficient.

scholarly journals Meniscal Injury Does Not Significantly Affect the Dimensions of the Intact Meniscus in the Opposite Compartment of the Knee

2020 ◽  
Vol 8 (2) ◽  
pp. 232596712090432
Author(s):  
Kyoung Ho Yoon ◽  
Sang Jun Song ◽  
Hee Sung Lee ◽  
Cheol Hee Park
Keyword(s):  
Lateral Meniscus ◽  
Cross Sectional Study ◽  
Control Group ◽  
Meniscal Injury ◽  
Sectional Study ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Intact Group ◽  
Meniscal Allograft ◽  
Opposite Compartment

Background: Meniscal allograft transplant requires precise matching of the size of the allograft with the dimensions of the recipient knee. Estimation of contralateral meniscal size on magnetic resonance imaging (MRI) has been considered the ideal method to measure menisci before transplant. We questioned whether a contralateral intact meniscus with meniscal injury in the opposite compartment could be used as a reference to determine allograft size. Our question was derived from knowledge of meniscal injury influencing structures of the opposite compartment of the knee, including the meniscus. Purpose: To compare meniscal dimensions between intact meniscus with meniscal injury in the opposite compartment and normal meniscus with a normal opposite compartment. Study Design: Cross-sectional study; Level of evidence, 3. Methods: This observational, cross-sectional study was performed between 2016 and 2017. The control group consisted of 200 knees with normal medial and lateral menisci. The medial intact group consisted of 150 cases of medial intact meniscus with injured lateral meniscus, and the lateral intact group consisted of 150 cases of lateral intact meniscus with injured medial meniscus. All patients were male. Mean age, height, and weight did not differ among groups. We investigated meniscal dimensions on MRI, including anteroposterior and mediolateral lengths, distance between the anterior and posterior horns (AHPH distance), and widths and heights of the anterior and posterior horns and midbody. Results: Most medial meniscal dimensions were similar between the control and medial intact groups, but the AHPH distance was smaller in the medial intact group ( P < .001). Likewise, most lateral meniscal dimensions were similar between the control and lateral intact groups, but the AHPH distance was smaller in the lateral intact group ( P < .001). Conclusion: Most dimensions of the intact meniscus with meniscal injury in the opposite compartment were similar to those of the normal meniscus with normal opposite compartment. Measuring the dimensions of the contralateral intact meniscus with meniscal injury in the opposite compartment on MRI can be an appropriate method to determine meniscal allograft size.

scholarly journals Prevalence of Morphological Variations Associated With Femoroacetabular Impingement According to Age and Sex: A Study of 1878 Asymptomatic Hips in Nonprofessional Athletes

2021 ◽  
Vol 9 (2) ◽  
pp. 232596712097789
Author(s):  
Rodolfo Morales-Avalos ◽  
Adriana Tapia-Náñez ◽  
Mario Simental-Mendía ◽  
Guillermo Elizondo-Riojas ◽  
Michelle Morcos-Sandino ◽  
...  
Keyword(s):  
Femoroacetabular Impingement ◽  
Alpha Angle ◽  
Cross Sectional Study ◽  
Level Of Evidence ◽  
Crossover Sign ◽  
Cross Sectional ◽  
Radiographic Findings ◽  
Morphological Variations ◽  
Pelvic Radiographs ◽  
Center Edge

Background: Radiographic findings related to the cam and pincer variants of femoroacetabular impingement (FAI) include measurements of the alpha angle and lateral center-edge angle (LCEA). The function of these radiographic findings has been put into question because of high heterogeneity in reported studies. Purpose: The aim of this study was 3-fold: (1) to determine the prevalence of cam and pincer variants according to sex and age on anteroposterior (AP) pelvic radiographs from an asymptomatic nonathletic population, (2) to identify the most common radiographic signs of cam- and pincer-type variants, and (3) to determine if there are variations in the prevalence of these radiographic signs according to sex and age. Study Design: Cross-sectional study; Level of evidence, 3. Methods: There were 3 independent observers who retrospectively analyzed the 939 AP pelvic radiographs (1878 hips) of patients aged 18 to 50 years who did not have hip symptoms and who were not professional athletes. The prevalence of the cam and pincer variants according to the alpha angle and LCEA, respectively, and the presence of other radiographic signs commonly associated with these variables were determined in the overall population and by subgroup according to sex and age group (18-30, 31-40, and 41-50 years). Descriptive and inferential statistics were used to analyze the study sample. Results: The mean age of the included population was 31.0 ± 9.2 years, and 68.2% were male. The prevalence of the cam-type variant was 29.7% (558/1878), and that of the pincer-type variant was 24.3% (456/1878). The radiographic signs that were most associated with the cam and pincer variants were a pistol-grip deformity and the crossover sign, respectively. Significant differences ( P < .001) in the prevalence of these variants were identified between men and women in both variants. No differences were observed in the alpha angle or LCEA according to sex or age. Conclusion: Radiographic findings suggestive of FAI had significant variations with respect to sex and age in this study sample. This study provides information to determine the prevalence of these anatomic variants in the general population.

Head Impact Biomechanics in Youth Flag Football: A Prospective Cohort Study

2021 ◽  
pp. 036354652110266
Author(s):  
Landon B. Lempke ◽  
Rachel S. Johnson ◽  
Rachel K. Le ◽  
Melissa N. Anderson ◽  
Julianne D. Schmidt ◽  
...  
Keyword(s):  
Mixed Model ◽  
Linear Acceleration ◽  
Cross Sectional Study ◽  
Head Impact ◽  
Rotational Acceleration ◽  
Event Type ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Head Impact Biomechanics ◽  
Impact Biomechanics

Background: Youth flag football participation has rapidly grown and is a potentially safer alternative to tackle football. However, limited research has quantitatively assessed youth flag football head impact biomechanics. Purpose: To describe head impact biomechanics outcomes in youth flag football and explore factors associated with head impact magnitudes. Study Design: Cross-sectional study; Level of evidence, 3. Methods: We monitored 52 player-seasons among 48 male flag football players (mean ± SD; age, 9.4 ± 1.1 years; height, 138.6 ± 9.5 cm; mass, 34.7 ± 9.2 kg) across 3 seasons using head impact sensors during practices and games. Sensors recorded head impact frequencies, peak linear ( g) and rotational (rad/s2) acceleration, and estimated impact location. Impact rates (IRs) were calculated as 1 impact per 10 player-exposures; IR ratios (IRRs) were used to compare season, event type, and age group IRs; and 95% CIs were calculated for IRs and IRRs. Weekly and seasonal cumulative head impact frequencies and magnitudes were calculated. Mixed-model regression models examined the association between player characteristics, event type, and seasons and peak linear and rotational accelerations. Results: A total of 429 head impacts from 604 exposures occurred across the study period (IR, 7.10; 95% CI, 4.81-10.50). Weekly and seasonal cumulative median head impact frequencies were 1.00 (range, 0-2.63) and 7.50 (range, 0-21.00), respectively. The most frequent estimated head impact locations were the skull base (n = 96; 22.4%), top of the head (n = 74; 17.2%), and back of the head (n = 66; 15.4%). The combined event type IRs differed among the 3 seasons (IRR range, 1.45-2.68). Games produced greater IRs (IRR, 1.24; 95% CI, 1.01-1.53) and peak linear acceleration (mean difference, 5.69 g; P = .008) than did practices. Older players demonstrated greater combined event–type IRs (IRR, 1.46; 95% CI, 1.12-1.90) and increased head impact magnitudes than did younger players, with every 1-year age increase associated with a 3.78 g and 602.81-rad/s2 increase in peak linear and rotational acceleration magnitude, respectively ( P≤ .005). Conclusion: Head IRs and magnitudes varied across seasons, thus highlighting multiple season and cohort data are valuable when providing estimates. Head IRs were relatively low across seasons, while linear and rotational acceleration magnitudes were relatively high.

scholarly journals Effect of the COVID-19 pandemic on the ability of level 1 trauma centers to meet American College of Surgeons research requirements

2021 ◽  
Vol 6 (1) ◽  
pp. e000692
Author(s):  
Robert M Madayag ◽  
Erica Sercy ◽  
Gina M Berg ◽  
Kaysie L Banton ◽  
Matthew Carrick ◽  
...  
Keyword(s):  
Cross Sectional Study ◽  
Trauma Centers ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
American College Of Surgeons ◽  
The Usa ◽  
Virus Exposure ◽  
Level 1 ◽  
Verification Process ◽  
Question Survey

IntroductionThe COVID-19 pandemic has had major effects on hospitals’ ability to perform scientific research while providing patient care and minimizing virus exposure and spread. Many non-COVID-19 research has been halted, and funding has been diverted to COVID-19 research and away from other areas.MethodsA 28-question survey was administered to all level 1 trauma centers in the USA that included questions about how the pandemic affected the trauma centers’ ability to fulfill the volume and research requirements of level 1 verification by the American College of Surgeons (ACS).ResultsThe survey had a 29% response rate (40/137 successful invitations). Over half of respondents (52%) reported reduced trauma admissions during the pandemic, and 7% reported that their admissions dropped below the volume required for level 1 verification. Many centers diverted resources from research during the pandemic (44%), halted ongoing consenting studies (33%), and had difficulty fulfilling research requirements because of competing clinical priorities (40%).DiscussionResults of this study show a need for flexibility in the ACS verification process during the COVID-19 pandemic, potentially including reduction of the required admissions and/or research publication volumes.Level of evidenceLevel IV, cross-sectional study.

scholarly journals Factors Associated With Knee Pain and Heel Pain in Youth Soccer Players Aged 8 to 12 Years

2019 ◽  
Vol 7 (11) ◽  
pp. 232596711988337 ◽  
Author(s):  
Toshiyuki Iwame ◽  
Tetsuya Matsuura ◽  
Naoto Suzue ◽  
Joji Iwase ◽  
Hirokazu Uemura ◽  
...  
Keyword(s):  
Knee Pain ◽  
Cross Sectional Study ◽  
Heel Pain ◽  
Older Age ◽  
Soccer Players ◽  
Clinical Factors ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Youth Soccer ◽  
Study Participants

Background: Soccer is played by many children younger than 12 years. Despite its health benefits, soccer has also been linked to a high number of sport-related injuries. Purpose: To investigate the relationship between clinical factors and knee or heel pain in youth soccer players. Study Design: Cross-sectional study; Level of evidence, 3. Methods: Study participants included 602 soccer players aged 8 to 12 years who were asked whether they had experienced episodes of knee or heel pain. Data were collected on age, body mass index, years of playing soccer, playing position, and training hours per week. Associations of clinical factors with the prevalence of knee or heel pain were examined by univariate and multivariate logistic regression analyses. Results: Episodes of knee and heel pain were reported by 29.4% and 31.1% of players, respectively. Multivariate analyses revealed that older age and more years of playing soccer were significantly and positively associated with the prevalence of knee pain ( P = .037 and P = .015 for trend, respectively) but did not identify any significant associations for heel pain. Conclusion: In this study of youth soccer players, knee pain was associated with older age and more years of play, but heel pain was not significantly associated with any factor.

Acetabular Chondral Lesions in Hip Arthroscopy: Relationships Between Grade, Topography, and Demographics

2017 ◽  
Vol 45 (11) ◽  
pp. 2501-2506 ◽  
Author(s):  
Carlos Suarez-Ahedo ◽  
Chengcheng Gui ◽  
Stephanie M. Rabe ◽  
Sivashankar Chandrasekaran ◽  
Parth Lodhia ◽  
...  
Keyword(s):  
Traumatic Injury ◽  
Demographic Factors ◽  
Patient Characteristics ◽  
Cross Sectional Study ◽  
Chondral Lesion ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Chondral Lesions ◽  
Chondral Damage ◽  
Male Sex

Background: Hip pain remains a challenge given the multiple factors that can cause damage to the articular cartilage, such as traumatic injury, metabolic damage, and morphologic variations such as femoroacetabular impingement (FAI) and that can contribute to progression of osteoarthritis. However, a direct relationship between patient characteristics, the extent of acetabular chondral damage, and topologic characteristics of chondral lesions has not been established. Purpose: To compare the grade of acetabular chondral damage, measured in terms of acetabular labrum articular disruption (ALAD) classification, to the size and position of the chondral lesions, matching patients’ demographic factors such as age and body mass index (BMI). Study Design: Cross-sectional study; Level of evidence, 3. Methods: This study included all hip arthroscopies performed by the corresponding author from August 7, 2008, to November 19, 2014, in which acetabular chondral lesions were intraoperatively identified and measured in terms of ALAD grade, clockface location, and size. Bivariate analyses and multiple logistic regression were used to identify the demographic factors, characteristics of the acetabular chondral lesion, and other anatomic characteristics that were related to the ALAD grade of the acetabular chondral lesion. Results: Acetabular chondral lesions were measured in 1502 patients during the study period. Multivariate analysis showed that higher ALAD grade of acetabular chondral damage was significantly related to male sex, more advanced age, the area of the acetabular chondral lesion, anterior extension of the acetabular chondral lesion within the anterosuperior quadrant, labral detachment from the acetabular cartilage, and posterior extension of the labral tear. Conclusion: Higher grades of acetabular chondral damage were related to male sex, increased age, height, weight, BMI, and the size of the lesion. Chondral lesions were generally found in the anterosuperior region of the acetabulum, consistent with labral lesions and the weightbearing area of the acetabulum.

scholarly journals Assessment and Trends in the Methodological Quality of the Top 50 Most Cited Articles in Shoulder Instability

2020 ◽  
Vol 8 (12) ◽  
pp. 232596712096708
Author(s):  
Avinesh Agarwalla ◽  
Kaisen Yao ◽  
Anirudh K. Gowd ◽  
Nirav H. Amin ◽  
J. Martin Leland ◽  
...  
Keyword(s):  
Bone Loss ◽  
Shoulder Instability ◽  
Methodological Quality ◽  
Surgical Techniques ◽  
Case Series ◽  
Cross Sectional Study ◽  
Retrospective Case ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Number Of Citations

Background: Citation counts have often been used as a surrogate for the scholarly impact of a particular study, but they do not necessarily correlate with higher-quality investigations. In recent decades, much of the literature regarding shoulder instability is focused on surgical techniques to correct bone loss and prevent recurrence. Purpose: To determine (1) the top 50 most cited articles in shoulder instability and (2) if there is a correlation between the number of citations and level of evidence or methodological quality. Study Design: Cross-sectional study. Methods: A literature search was performed on both the Scopus and the Web of Science databases to determine the top 50 most cited articles in shoulder instability between 1985 and 2019. The search terms used included “shoulder instability,” “humeral defect,” and “glenoid bone loss.” Methodological scores were calculated using the Modified Coleman Methodology Score (MCMS), Jadad scale, and Methodological Index for Non-Randomized Studies (MINORS) score. Results: The mean number of citations and mean citation density were 222.7 ± 123.5 (range, 124-881.5) and 16.0 ± 7.9 (range, 6.9-49.0), respectively. The most common type of study represented was the retrospective case series (evidence level, 4; n = 16; 32%) The overall mean MCMS, Jadad score, and MINORS score were 61.1 ± 10.1, 1.4 ± 0.9, and 16.0 ± 3.0, respectively. There were also no correlations found between mean citations or citation density versus each of the methodological quality scores. Conclusion: The list of top 50 most cited articles in shoulder instability comprised studies with low-level evidence and low methodological quality. Higher-quality study methodology does not appear to be a significant factor in whether studies are frequently cited in the literature.

scholarly journals ORTHOPEDIC INJURIES IN MEN'S PROFESSIONAL SOCCER IN BRAZIL: PROSPECTIVE COMPARISON OF TWO CONSECUTIVE SEASONS 2017/2016

2018 ◽  
Vol 26 (5) ◽  
pp. 338-341 ◽  
Author(s):  
Eduardo Ramalho de Moraes ◽  
Gustavo Gonçalves Arliani ◽  
Paulo Henrique Schmidt Lara ◽  
Eli Henrique Rodrigues da Silva ◽  
Jorge Roberto Pagura ◽  
...  
Keyword(s):  
Cross Sectional Study ◽  
Sao Paulo ◽  
Lower Limbs ◽  
São Paulo ◽  
Level Of Evidence ◽  
Cross Sectional ◽  
Paulo State ◽  
Professional Soccer ◽  
Prospective Comparison ◽  
São Paulo State

ABSTRACT Purpose: The purpose is to compare the incidence and characteristics of injuries sustained in two consecutive seasons of the São Paulo State Football Championship. Methods: Prospective study performed using an electronic form previously developed by the Medical Committee of the São Paulo State Football Federation, sent to the physicians responsible for the tournament's series A1 and A2 teams, after each round. Results: 17.63 injuries sustained per 1000 hours of matches in the A1 series and 14.91 injuries sustained per 1000 hours of matches in the A2 series. Incidence of injuries per 1000 hours of matches decreased from 24.16 to 17.63 in the A1 series (p<0.037) and from 19.10 to 14.01 in the A2 series (p<0.064). External defenders suffered most injuries, while muscular injuries were most common and lower limbs, the most affected areas. Most injuries occurred between 30 and 45 minutes of the match and only 11.9% of the injuries required surgery. Conclusions: Prevalence and frequency of injuries decreased between seasons. Most injuries were sustained in the lower limbs; strains were the most common injuries, followed by strains and contusions; MRIs were the most frequently requested exams and most injuries were classified as moderate (8-28 days). Level of evidence III, Cross-Sectional Study.

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