A three-dimensional measurement method on MR arthrography of the hip to classify femoro-acetabular impingement

Abstract Purpose (1) To investigate correlations between different types of FAI and the ratio of acetabular volume (AV) to femoral head volume (FV) on MR arthrography. (2) To assess 2D/3D measurements in identifying different types of FAI by means of cut-off values of AV/FV ratio (AFR). Materials and methods Alpha angle, cranial acetabular version, acetabular depth, lateral center edge angle, AV, and FV of 52 hip MR arthrography were measured. ANOVA test correlated different types of FAI with AFR. ROC curves classified FAI by cut-off values of AFR. Accuracy of 2D/3D measurements was calculated. Results ANOVA test showed a significant difference of AFR (p value < 0.001) among the three types of FAI. The mean values of AFR were 0.64, 0.74, and 0.89 in cam, mixed, and pincer types, respectively. Cut-off values of AFR were 0.70 to distinguish cam types from mixed and pincer types, and 0.79 to distinguish pincer types from cam and mixed types. Cut-off values identified 100%, 73.9%, and 55.6% of pincer, cam, and mixed types. 2D and 3D classifications of FAI showed accuracy of 40.4% and 73.0%. Conclusions 3D measurements were clearly more accurate than 2D measurements. Distinct cut-off values of AFR discriminated cam types from pincer types and identified pincer types in all cases. Cam and mixed types were not accurately recognized.

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Analysis of morphological parameters in pelvic radiography and hip MRI : a practical reporting recommendation

Acta Orthopaedica Belgica ◽

10.52628/87.2.11 ◽

2021 ◽

Vol 87 (2) ◽

pp. 275-283

Author(s):

Esin Derin Cicek ◽

Halime Cevik

Keyword(s):

Imaging Modality ◽

Alpha Angle ◽

Practical Approach ◽

Mean Values ◽

Center Edge ◽

Acetabular Protrusion ◽

Pelvic Radiograph ◽

Hip Morphology ◽

Significant Difference ◽

The Difference

Although numerous criteria have been proposed to define abnormal hip morphology, mostly used in the diagnosis of femoroacetabular impingement, it is not a practical approach to measure all of these parameters in all cases without clinical suspicion. In this study, our aim was to develop an evaluating and reporting standardization for routine hip examinations to define both hip morphology and impingement. A total of 108 patients with routine hip magnetic resonance imaging (MRI) and antero-posterior pelvic radiograph (PR) were included in this retrospective study. Alpha angle (AA), acetabular depth (AD), acetabular protrusion, acetabular anteversion, collo- diaphyseal angle (CDA), lateral center-edge angle (LCEA) and Tönnis angle (TA) were measured. The differences and associations between these parameters were evaluated according to imaging modality or plane, and sex. Although a significant difference has been found between the axial AA and the coronal AA mean values measured on MRI, there was also a strong correlation. Coronal measurements were significantly higher. AA values measured in PR and coronal MRI were comparable. Males had higher AA in both planes as compared to females. There were no significant differences between CDA values in MRI and PR. There was a significant difference and a moderate correlation between AD values in MRI and PR. We suggest that routine reports should include a measurement of AA in two planes, and measurement of CDA in PR or MRI. Due to the difference in AD between MRI and radiography, LCEA or TA may represent better alternatives. Checking for a negative Tönnis sign would represent a practical approach.

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BORDERLINE ACETABULAR DYSPLASIA: THREE-DIMENSIONAL DEFORMITY PREDICTORS OF THE DIAGNOSIS OF SYMPTOMATIC INSTABILITY TREATED WITH PERIACETABULAR OSTEOTOMY

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967121s00160 ◽

2021 ◽

Vol 9 (7_suppl3) ◽

pp. 2325967121S0016

Author(s):

Elizabeth Graesser ◽

Maria Schwabe ◽

Cecilia Pascual Garrido ◽

John C. Clohisy ◽

Jeffrey J. Nepple

Keyword(s):

Low Dose ◽

Acetabular Dysplasia ◽

Periacetabular Osteotomy ◽

Alpha Angle ◽

Three Dimensional ◽

Acetabular Coverage ◽

Low Dose Ct ◽

Femoral Version ◽

Center Edge ◽

Hip Morphology

Introduction: Borderline acetabular dysplasia is classically defined as a lateral center edge angle (LCEA) of 20-25 degrees. The optimal treatment strategy in this patient group remains controversial, with some patients having primarily hip instability-based symptoms, while others have primarily impingement-based symptoms (non-instability). The purpose of the current study was to define the 3D characteristics on low-dose CT that differentiate patients with instability symptoms from those without instability in the setting of borderline acetabular dysplasia. Methods: Seventy consecutive hips with borderline acetabular dysplasia undergoing surgical treatment were included in the current study. All patients underwent low-dose pelvic CT with femoral version assessment for preoperative planning. CT measurements included alpha angle and radial acetabular coverage (RAC) at standardized clockface positions (9:00-posterior to 3:00-anterior), central and cranial acetabular version. RAC was assessed in three sectors (anterior, superior, and posterior) and defined (relative to published normative data) as normal (-1 SD, +1 SD), undercoverage (<-1 SD), or overcoverage (>+1 SD). Statistical analysis was performed to compare the CT characteristics of the symptomatic instability and non-instability groups. Results: Of the 70 hips, 62.9% had the diagnosis of symptomatic instability, while 37.1% had no instability symptoms. Hips with instability (compared to non-instability) had significantly lower alpha angle (maximal difference at 1:00 - 47.0° vs. 59.4°), increased femoral version (22.3° vs. 15.3°), and decreased radial acetabular coverage (maximal difference at 1:00 – 59.9% vs. 62.2%) (all p<0.001). Multivariate analysis identified femoral version (OR 1.1, p=0.02), alpha angle at 1:00 (OR 0.91, p=0.02), and RAC at 1:00 (OR 0.46, p=0.003) as independent predictors of the presence of instability. The model combining these three factors had excellent predictive probability with a c-statistic 0.92. Conclusion: We found significant differences in the 3D hip morphology of the symptomatic instability and non-instability subgroups within the borderline dysplasia cohort. In the setting of borderline dysplasia, three-dimensional deformity characterization with low-dose CT allowed for differentiation of patients diagnosed with underlying instability vs. non-instability. Femoral version, alpha angle at 1:00, and radial acetabular coverage at 1:00 were identified as independent predictors of diagnosis in borderline acetabular dysplasia. Summary: This study attempts to define 3D CT characteristics to help distinguish between patients with impingement-based vs instability-based symptoms of borderline acetabular dysplasia.

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VALIDITY OF THREE-DIMENSIONAL PHOTONIC SCANNING TECHNIQUE FOR ESTIMATING PERCENT BODY FAT

Journal of Frailty & Aging ◽

10.14283/jfa.2013.28 ◽

2013 ◽

pp. 1-6

Author(s):

K. SHITARA ◽

H. KANEHISA ◽

T. FUKUNAGA ◽

T. YANAI ◽

Y. KAWAKAMI

Keyword(s):

Body Fat ◽

Lung Volume ◽

Three Dimensional ◽

The Body ◽

Percent Body Fat ◽

Body Volume ◽

Mean Values ◽

Significant Difference ◽

Human Body Surface ◽

Estimated Error

Background:Three-dimensional photonic scanning (3DPS) was recently developed to measuredimensions of a human body surface. Objective:The purpose of this study was to explore the validity of bodyvolume measured by 3DPS for estimating the percent body fat (%fat). Design, setting, participants, andmeasurement:The body volumes were determined by 3DPS in 52 women. The body volume was corrected forresidual lung volume. The %fat was estimated from body density and compared with the corresponding referencevalue determined by the dual-energy x-ray absorptiometry (DXA). Results:No significant difference was foundfor the mean values of %fat obtained by 3DPS (22.2 ± 7.6%) and DXA (23.5 ± 4.9%). The root mean squareerror of %fat between 3DPS and reference technique was 6.0%. For each body segment, there was a significantpositive correlation between 3DPS- and DXA-values, although the corresponding value for the head was slightlylarger in 3DPS than in DXA. Residual lung volume was negatively correlated with the estimated error in %fat.Conclusions:The body volume determined with 3DPS is potentially useful for estimating %fat. A possiblestrategy for enhancing the measurement accuracy of %fat might be to refine the protocol for preparing thesubject’s hair prior to scanning and to improve the accuracy in the measurement of residual lung volume.

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Effect of Reduced Occlusal Thickness with Two Margin Designs on Fracture Resistance of Monolithic Zirconia Crowns

European Journal of Dentistry ◽

10.1055/s-0040-1709342 ◽

2020 ◽

Vol 14 (02) ◽

pp. 245-249

Author(s):

Haider Hasan Jasim ◽

Meelad Basil Findakly ◽

Nada Ali Mahdi ◽

Mustafa Tariq Mutar

Keyword(s):

Fracture Resistance ◽

Testing Machine ◽

Three Dimensional ◽

Fracture Load ◽

Anova Test ◽

Optical Scanner ◽

Nickel Chromium ◽

Significant Difference ◽

Zirconia Crowns ◽

Monolithic Zirconia

Abstract Objectives The aim of this study was to compare the effects of two margin designs (shoulderless and slight chamfer) with two occlusal thicknesses on fracture resistance and failure mode of the monolithic zirconia crowns. Materials and Methods Forty nickel–chromium dies were duplicated from the previous two prepared teeth using a three-dimensional optical scanner. Nickel–chromium supporting dies were divided into two main groups (n = 20) according to the type of margin design: group A, slight chamfer margin design and group B, shoulderless margin design. These groups were further divided into two subgroups according to the occlusal thicknesses (0.5 and 1 mm). The digital imaging of each die was done using a three-dimensional optical scanner, then zirconia blocks were milled by 5-axis machine. The crowns were cleaned by alcohol, air dried, and cemented by resin cement. Next, the crowns were subjected to 500 hot and cold cycles (30 seconds for each cycle). The samples were subjected to a static load until failure using an electronic universal testing machine and fracture resistance was recorded in Newton (N). Statistical Analysis Data were analyzed using the test of normality (Shapiro–Wilk test) and two-way analysis of variance (ANOVA) test. Results The highest mean fracture load was recorded by the shoulderless (1 mm occlusal thickness) subgroup (3,992.5 N), followed by shoulderless (0.5 mm occlusal thickness) subgroup (3,244.4 N), and the slight chamfer (1 mm occlusal thickness) subgroup (2,811 N). The lowest mean of fracture load was recorded by slight chamfer (0.5 mm occlusal thickness) subgroup (1,632.9 N). The two-way ANOVA test revealed a significant difference between the four subgroups. Regarding the fracture mode, the slight chamfer subgroups showed a severe fracture of the restoration while the shoulderless subgroups showed a fracture through the midline of the restoration. Conclusion Within the limitation of the comparative study, shoulderless margin design has a more favorable outcome than a slight chamfer design in all thicknesses. Although the restoration with reduced occlusal thickness has lower fracture resistance than 1 mm occlusal thickness, the 0.5 mm restorations still can tolerate occlusal forces.

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Acetabular Dysplasia: Three-Dimensional Deformity Predictors of the Diagnosis of Symptomatic Instability Treated with Periacetabular Osteotomy

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967120s00426 ◽

2020 ◽

Vol 8 (7_suppl6) ◽

pp. 2325967120S0042

Author(s):

Maria Schwabe ◽

Cecilia Pascual-Garrido ◽

John Clohisy ◽

Elizabeth Graesser ◽

Jeffrey Nepple

Keyword(s):

Low Dose ◽

Acetabular Dysplasia ◽

Periacetabular Osteotomy ◽

Alpha Angle ◽

Three Dimensional ◽

Acetabular Coverage ◽

Low Dose Ct ◽

Femoral Version ◽

Center Edge ◽

Hip Morphology

Objectives: Borderline acetabular dysplasia is classically defined as a lateral center edge angle (LCEA) of 20-25 degrees. The optimal treatment strategy in this patient group remains controversial, with some patients having primarily hip instability-based symptoms, while others have primarily impingement-based symptoms (non-instability). The purpose of the current study was to define the 3D characteristics on low-dose CT that differentiate patients with instability symptoms from those without instability in the setting of borderline acetabular dysplasia. Methods: Seventy consecutive hips with borderline acetabular dysplasia undergoing surgical treatment were included in the current study. All patients underwent low-dose pelvic CT with femoral version assessment for preoperative planning. CT measurements included alpha angle and radial acetabular coverage (RAC) at standardized clockface positions (9:00-posterior to 3:00-anterior), central and cranial acetabular version. RAC was assessed in three sectors (anterior, superior, and posterior) and defined (relative to published normative data) as normal (-1 SD, +1 SD), undercoverage (<-1 SD), or overcoverage (>+1 SD). Statistical analysis was performed to compare the CT characteristics of the symptomatic instability and non-instability groups. Results: Of the 70 hips, 62.9% had the diagnosis of symptomatic instability, while 37.1% had no instability symptoms. Hips with instability (compared to non-instability) had significantly lower alpha angle (maximal difference at 1:00 - 47.0° vs. 59.4°), increased femoral version (22.3° vs. 15.3°), and decreased radial acetabular coverage (maximal difference at 1:00 – 59.9% vs. 62.2%) (all p<0.001). Multivariate analysis identified femoral version (OR 1.1, p=0.02), alpha angle at 1:00 (OR 0.91, p=0.02), and RAC at 1:00 (OR 0.46, p=0.003) as independent predictors of the presence of instability. The model combining these three factors had excellent predictive probability with a c-statistic 0.92. Conclusion: We found significant differences in the 3D hip morphology of the symptomatic instability and non-instability subgroups within the borderline dysplasia cohort. In the setting of borderline dysplasia, three-dimensional deformity characterization with low-dose CT allowed for differentiation of patients diagnosed with underlying instability vs. non-instability. Femoral version, alpha angle at 1:00, and radial acetabular coverage at 1:00 were identified as independent predictors of diagnosis in borderline acetabular dysplasia.

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Energy balance in the poultry-shed system and its influence on broiler performance

Engenharia Agrícola ◽

10.1590/1809-4430-eng.agric.v35n4p613-624/2015 ◽

2015 ◽

Vol 35 (4) ◽

pp. 613-624 ◽

Cited By ~ 1

Author(s):

Tatiana P. N. da Silva ◽

Héliton Pandorfi ◽

Cristiane Guiselini

Keyword(s):

Energy Balance ◽

Feed Consumption ◽

Production Cycle ◽

Productive Performance ◽

Feed Conversion ◽

Broiler Performance ◽

Mean Values ◽

Significant Difference ◽

Different Types ◽

The Mean

ABSTRACT The objective of this study was to determine the energy balance of the poultry-shed system and its effect on broiler performance during the production cycle. The experimental design was completely random with sub-divided blocks. The blocks were composed of five different types of sheds and the sub-blocks of the evaluation times (00:00 h to 23:00 h), allowing an analysis of variance and a comparison between means with the Tukey test. There were no significant differences between the mean values of the exchanges of sensible, latent and total heat between the poultry sheds but the differences for the evaluation times were significant (P<0.05). There was no significant difference between sheds 1 and 4 for broiler productive performance regarding weight gain, feed consumption and feed conversion. Bird performance was significant (P<0.05) for the remaining poultry sheds. The productive indexes remained below the ranges considered ideal for broilers and values in the final weeks were characterized by the poor installation efficiency in controlling temperature variations and, consequently, the energy balance in the system, which adversely affected bird productive performance.

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Compositional Growth and Variation of Priority Sector Lendings’ (PSL) by Assam Gramin Vikash Bank

Indian Journal of Economics and Development ◽

10.35716/ijed/19077 ◽

2020 ◽

pp. 296-300

Keyword(s):

Low Income ◽

Rural Areas ◽

Bank Loans ◽

Poor People ◽

Annual Growth Rate ◽

Mean Values ◽

Reserve Bank ◽

Significant Difference ◽

Different Types ◽

Test Result

Banks in India are directed by the Reserve Bank of India to provide specified proportion (40 percent of adjusted net bank credit) of the bank loans termed as Priority Sector Loans (PSL) to the specified sectors like agriculture and allied activities, micro and small enterprises, poor people for housing, students for education and other low-income segments of the rural population. This is essentially meant for all-round development of the economy as opposed to focusing only on the financial sector. Likewise, Assam Gramin Vikash Bank is a Regional Rural Bank operating in rural areas of Assam meant for serving the needs of the rural populations. Assam Gramin Vikash Bank was successful in attaining the quantitative target prescribed for the RRB i.e. a target of 40 percent lending to the priority sector. The major share of PSL loans (43 percent) goes to the agriculture and allied sectors. The Levene’s test result revealed that there was no significant variation in the two different types of loans provided by the AGVB, namely PSL and other types of loans. Furthermore, the independent t-test result also revealed that there was no significant difference between the mean values of the two different types (PSL and Non-PSL) of loans provided by the AGVB, implying that the share was consistent separately throughout the period 2010-2017. It was found that the amount of PSL loans provided by the AGVB was consistently increasing by `365.9 crores per annum. However, the annual growth rate of the PSL loans, sub-sector wise was found to be declining drastically for all the sectors for the period 2010-2017.

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A comparative evaluation of three dimensional accuracy of different types of interocclusal recording materials - an in vitro study

Medicine and Pharmacy Reports ◽

10.15386/mpr-1453 ◽

2020 ◽

Author(s):

Aparna Dwivedi ◽

Kavita Maru ◽

Aakash Sharma

Keyword(s):

Three Dimensional ◽

In Vitro Study ◽

Dimensional Accuracy ◽

Vitro Study ◽

Time Intervals ◽

Group I ◽

Significant Difference ◽

Different Types ◽

Measuring Machine

Introduction. The interocclusal registration materials record the occlusal relationship between the natural and /or artificial teeth for planning an occlusal rehabilitation in removable and fixed partial dentures. Aim and objectives. The aim of this in vitro study was to evaluate and compare the accuracy and the three dimensional stability offered by three different types of interocclusal recording materials at storage time intervals of 1 hour and 24 hours. Methods. Three commercially available interocclusal recording materials were used - Group I - Polyether bite registration paste (Ramitec), Group II- Polyvinylsiloxane bite registration material (Imprint), Group III- Bite registration wax (Maarc).The test was carried out using an epoxy resin model. A total of 30 samples were made with each group consisting of ten samples. Three dimensional measurements were carried out by using 3D-Coordinate measuring machine (CMM) at time intervals of 0-1 hour and 0-24 hours in X, Y and Z- axis. Results. Twelve readings were obtained for three axes (4 readings for each sample at 1 axis) and the averages of these four values were noted for a particular axis (X/Y/Z). Statistical analysis was performed using analysis of variance (ANOVA) for comparison among the groups and then Tukey’s honestly significant difference (HSD) tests was performed for comparison among groups at the 0.05 level of significance. Conclusion. Polyvinylsiloxane was dimensionally the most stable material followed by polyether and finally bite registration wax. Dimensional accuracy and stability is influenced by both “material” and “time” factors.

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Characteristics of femoroacetabular impingement morphology and relation with skeletal maturity among asymptomatic adolescents

Acta Orthopaedica Belgica ◽

10.52628/87.1.07 ◽

2021 ◽

Vol 87 (1) ◽

pp. 47-54

Author(s):

Mehmet Kaymakoglu ◽

Raziye Dut ◽

Duygu Imre ◽

Fatma Bilge Ergen ◽

Mehmet Ali Talmac ◽

...

Keyword(s):

Femoral Neck ◽

Skeletal Maturity ◽

Alpha Angle ◽

Morphological Characteristics ◽

Skeletal Maturation ◽

Physiological Status ◽

Triradiate Cartilage ◽

Center Edge ◽

Significant Difference ◽

Femoral Physis

The aim of this study was to analyze presence of the morphological characteristics and prevalence of FAI in asymptomatic adolescents and assess the relation of skeletal maturation with development of FAI morphology. Abdominopelvic computed tomography (CT) of 265 adolescents (9-19 years old) who were admitted to the emergency department between 2011 and 2016 were evaluated retrospectively. Radial reformatted CT images from the femoral neck were created using the multiplanar reconstruction (MPR) method. The femoral neck was divided into 12 segments and alpha angle (AA), femoral head-neck ratio (FHNR) and center-edge angle (CEA) were measured from each segment. Additionally, images were evaluated for the physiological status (open or closed) of the triradiate- cartilage and proximal femoral epiphyses. 204 hips from 102 patients (32 females, 70 males) were retrospectively reviewed. There were 27 (26.5%) patients with cam-type morphology and 18 (17.6%) patients with pincer-type morphologies. No statistically significant difference was detected between the prevalences of cam and pincer morphologies between the two genders. Cam deformity was most frequently seen in anterosuperior segment. All of the patients (100%) with pincer-type morphology and 88% of the patients with cam-type morphology had closed triradiate cartilage, 89% of the patients with cam morphology and 83% with pincer morphology had open proximal femoral physis. Our results showed that prevalence of cam and pincer-type morphology in asymptomatic adolescents is similar to asymptomatic adults. Our findings also indicate that cam- and pincer-type FAI morphologies likely develop during late adolescence after closure of triradiate cartilage and before closure of proximal femoral physis. Level of Evidence - 3

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Are there Sex differences in Return to Play Rates in High Level Athletes Following Hip Arthroscopy?

Orthopaedic Journal of Sports Medicine ◽

10.1177/2325967120s00428 ◽

2020 ◽

Vol 8 (7_suppl6) ◽

pp. 2325967120S0042

Author(s):

Matthew Dooley ◽

Joost Burger ◽

Bryan Kelly ◽

Eilish O’Sullivan

Keyword(s):

Femoroacetabular Impingement ◽

Hip Arthroscopy ◽

Female Athletes ◽

Alpha Angle ◽

Return To Sport ◽

Collegiate Athletes ◽

Return To Play ◽

Center Edge ◽

Significant Difference ◽

High Level

Objectives: Return to sport is a common co ncern in those undergoing arthroscopic surgery for the treatment of femoroacetabular impingement. These are commonly young active individuals with high-level athletic aspirations. Setting expectations in terms of appropriate time frame and success rates are an integral piece of pre-operative education and planning. The goals of this study were to examine return to play (RTP) rates and time frames in professional and collegiate athletes following hip arthroscopy, evaluate sex differences in return to play (morphology and rates), and evaluate differences in return to play for the most common sports. Methods: A retrospective review of a continuous cohort of patients undergoing hip arthroscopy for the treatment of femoroacetabular impingement and labral injury was conducted between January 2014 and December 2018. Athletes whom were participating in collegiate or professional sports prior to surgery were included. Chart review was conducted to gather sport specific information, morphologic data, clearance dates, successful return, and subsequent surgery. Successful return to sport was determined by being able to return to participation following clearance in at least one season. Descriptive statistics were utilized to summarize the data set and chi-square and t-tests were utilized to examine differences between groups. Results: 265 patients undergoing 332 hip arthroscopies participating in collegiate or professional sports prior to surgery were identified (75.4% male and 24.6% female), with 237 collegiate athletes and 95 professional athletes. There was a significant difference in mean alpha angles between males and females, 70.2 ± 10.5 males and 60.7± 10.0 in females, (p<0.001), but no significant differences in coronal center edge angles or femoral version. 87% of the athletes participated in hockey, football, lacrosse, soccer, baseball, soccer, or basketball. Given that a significant portion of the athletes were in college, there was a portion that graduated and thus no longer participated in collegiate athletics (27 hips), and 3 athletes (all with bilateral hip arthroscopies) were unable to return to sport due to other conditions. 91.9% of athletes were able to return to sport. 19 athletes (22 hips) were unable to return to sport. The group that was unable to return was predominantly female (73%), and this difference was significant (p<0.001). There was a significant difference between the returning group and the group that failed to return to sport in alpha angle (RTP 68.6 ± 10.8 vs No RTP 60.7± 10.6), but there were no differences in coronal center edge angle or femoral version. The difference in alpha angle is due to the predominance of females (whom had significantly lower alphas) in the unable to return group. 10 athletes (11 hips, 3.3%) required subsequent surgery (revision arthroscopy, conversion to periacetabular osteotomy, or hip resurfacing). Times for return to play were available to 205 of the athletes, averaging 6.8 months± 2.8. There was no significant difference between the males and females for return to play. There was trend towards shorter length of return for hockey athletes. There was a significant difference in the return to sport rates between the sport groups, but there were some groups with smaller sample sizes that should be taken into account. The groups with more athletes unable to return were soccer and lacrosse; these sports also had a high number of female athletes. There were no hockey athletes that were unable to return, and only 1 football athlete was unable to return. Conclusions: Hip arthroscopy for the treatment of femoroacetabular impingement and labral injury allows patients to return to sport at a high level within an average of 6.8 months. However, female athletes are less likely to have a successful return and should potentially be counseled as such. This may also inform pre-operative rehabilitation programs and intra-operative planning for female athletes. Further research should examine causes for decreased rate of return for females, and potential ways to maximize recovery and return to sport following hip arthroscopy. [Table: see text]

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