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Hoffer AJ, St George SA, Lanting BA, Degen RM, Ng KCG. A Hip Circumferential Labral Reconstruction Provides Similar Distractive Stability to a Labral Repair After Cam Over-Resection in a Biomechanical Model. Arthroscopy 2024:S0749-8063(24)00551-6. [PMID: 39128683 DOI: 10.1016/j.arthro.2024.07.023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2024] [Revised: 07/12/2024] [Accepted: 07/27/2024] [Indexed: 08/13/2024]
Abstract
PURPOSE To evaluate the change in hip distractive stability after a cam over-resection, labral tear, repair, labrectomy, or circumferential 6-mm or 10-mm labral reconstruction in a biomechanical model. METHODS Ten fresh-frozen matched pair human cadaveric hips were analyzed using a materials testing system to measure the force and distance required to disrupt the suction seal of the hip (1) with an intact capsule and labrum, (2) after a capsulectomy and labral repair, (3) after a capsulectomy, 5-mm cam over-resection and labral repair, (4) after a capsulectomy, 5-mm cam over-resection and labral tear, (5) after a capsulectomy, 5-mm cam over-resection and labrectomy, and (6) after a capsulectomy, 5-mm cam over-resection, and a 6- or 10-mm circumferential labral reconstruction with iliotibial band (5 hips each). Each specimen was retested at 0° flexion, 45° flexion, and 45° flexion and 15° internal rotation and analyzed using non-parametric statistical methods. RESULTS The Friedman test of differences was significant among structural conditions and hip positions (P = 0.001). In all positions, the resistive force that opposed the disruption of the suction seal in an intact hip was significantly greater compared to all other conditions. The resistive force for the capsulectomy, 5-mm cam over-resection and labrectomy condition was significantly less compared to almost all other conditions and hip positions. A qualitative suction seal was achieved in 20% of hip specimens with a 6-mm labral reconstruction while a seal was in achieved 60% of specimens with a 10-mm labral reconstruction. CONCLUSIONS After a cam over-resection, a circumferential labral reconstruction improves the distractive stability of a labral deficient hip, comparable to a labral repair or tear in a biomechanical model. CLINICAL RELEVANCE Circumferential labral reconstruction may be a viable treatment option for patients with ongoing symptoms after hip arthroscopy with evidence of a cam over-resection and a deficient labrum.
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Affiliation(s)
- Alexander J Hoffer
- Department of Surgery, University of Western Ontario, London, ON, Canada
| | - Stefan A St George
- Department of Surgery, University of Western Ontario, London, ON, Canada
| | - Brent A Lanting
- Department of Surgery, University of Western Ontario, London, ON, Canada
| | - Ryan M Degen
- Department of Surgery, University of Western Ontario, London, ON, Canada; Fowler Kennedy Sports Medicine Clinic, London, ON, Canada
| | - K C Geoffrey Ng
- Department of Medical Biophysics, University of Western Ontario, London, ON, Canada; Department of Medical Imaging, University of Western Ontario, London, ON, Canada; Department of Surgery, University of Western Ontario, London, ON, Canada; Robarts Research Institute, London, ON, Canada.
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Hoffer AJ, Beel W, Ng KG, Degen RM. The Contribution of Soft Tissue and Bony Stabilizers to the Hip Suction Seal: A Systematic Review of Biomechanical Studies. Am J Sports Med 2024; 52:2657-2666. [PMID: 38318815 PMCID: PMC11344966 DOI: 10.1177/03635465231208193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Accepted: 08/30/2023] [Indexed: 02/07/2024]
Abstract
BACKGROUND Previous biomechanical studies have identified capsular closure, labral repair or reconstruction, and osteochondroplasty as important surgical interventions to improve hip stability. PURPOSE To investigate the outcome metrics used to quantify hip stability and assess and measure the relative contributions of the labrum, capsule, and bone to hip stability through a quantitative analysis. STUDY DESIGN Systematic review and meta-analysis; Level of evidence, 4. METHODS PubMed and Embase databases were searched using the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. Included studies evaluated cadaveric hip biomechanics related to capsular, labral, and bony management during hip arthroscopy. Studies were assessed for distraction force and distance, fluid measures, and contact forces used to quantify the suction seal. Exclusion criteria included open surgery, arthroplasty, reorientation osteotomy, or traumatic dislocation. RESULTS A total of 33 biomechanical studies comprising 322 hips that evaluated 1 or more of the following were included: distraction force or distance (24 studies), fluid measures (10 studies), and contact forces (6 studies). Compared with a capsulotomy or capsulectomy, capsular repair or reconstruction demonstrated greater resistance to distraction (standardized mean difference [SMD], 1.13; 95% CI, 0.46-1.80; P = .0009). Compared with a labral tear, a labral repair or reconstruction demonstrated less resistance to distraction (SMD, -0.67; 95% CI, -1.25 to -0.09; P = .02). Compared with a labral debridement, repair or reconstruction demonstrated greater resistance to distraction (SMD, 1.74; 95% CI, 1.23 to 2.26; P < .00001). No quantitative analysis was feasible from studies evaluating the effect of osseous resection due to the heterogeneity in methodology and outcome metrics assessed. CONCLUSION Most biomechanical evidence supports capsulotomy repair or reconstruction to improve hip distractive stability at the end of hip arthroscopic surgery. While the repair of a torn labrum does not improve distractive resistance, it is superior to labral debridement in most biomechanical studies.
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Affiliation(s)
- Alexander J. Hoffer
- Department of Surgery, The University of Western Ontario, London, Ontario, Canada
- Fowler Kennedy Sport Medicine Clinic, London, Ontario, Canada
| | - Wouter Beel
- Department of Surgery, The University of Western Ontario, London, Ontario, Canada
- Fowler Kennedy Sport Medicine Clinic, London, Ontario, Canada
| | - K.C. Geoffrey Ng
- Department of Surgery, The University of Western Ontario, London, Ontario, Canada
- Department of Medical Biophysics, The University of Western Ontario, London, Ontario, Canada
- Department of Medical Imaging, The University of Western Ontario, London, Ontario, Canada
- Robarts Research Institute, The University of Western Ontario, London, Ontario, Canada
| | - Ryan M. Degen
- Department of Surgery, The University of Western Ontario, London, Ontario, Canada
- Fowler Kennedy Sport Medicine Clinic, London, Ontario, Canada
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Dean MC, Cherian NJ, McBroom TJ, Eberlin CT, Torabian KA, Dowley KS, LaPorte ZL, Kucharik MP, Martin SD. Preoperative Paralabral Cysts Predict More Significant Chondral Damage but Not 2-Year Functional Outcomes Following Arthroscopic Labral Repair. Arthroscopy 2024; 40:1475-1487.e1. [PMID: 37865131 DOI: 10.1016/j.arthro.2023.10.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 09/20/2023] [Accepted: 10/12/2023] [Indexed: 10/23/2023]
Abstract
PURPOSE To investigate whether paralabral cysts identified incidentally on preoperative magnetic resonance imaging/arthrography predict 2-year functional outcomes after arthroscopic acetabular labral repair. METHODS Prospectively collected data for patients undergoing primary hip arthroscopy by a single surgeon from 2014 to 2020 were retrospectively reviewed. Included patients were ≥18 years and completed baseline patient-reported outcome measures (PROMs) with additional follow-up at 3, 6, 12, and 24 months. Exclusion criteria were labral debridement, hip dysplasia, advanced hip osteoarthritis (Tönnis > 1), or previous ipsilateral hip surgery. Patients were stratified based on the presence of paralabral cysts identified on magnetic resonance imaging/arthrography. Primary outcomes were International Hip Outcome Tool and modified Harris Hip Score. Secondary outcomes included other PROMs and the visual analog pain scale. Outcomes were compared between cohorts using linear mixed-effects models and Fisher's exact tests. Sensitivity analyses accounted for preoperative PROMs, nonlinear improvement trajectories, and relevant baseline characteristics. RESULTS Of the 182 included hips (47.8% female; mean ± standard deviation age, 36.9 ± 11.4), 30 (16.4%) had paralabral cysts. During the 2-year study period, there were no significant differences between patients with and without paralabral cysts in terms of International Hip Outcome Tool scores (weighted difference = 1.60; 95% confidence interval [CI], -5.09, 8.28; P = .64), modified Harris Hip Scores (weighted difference = 0.56; 95% CI, -4.16, 5.28; P = .82), or any secondary outcomes (except for HOS-Sports Subscale at 3 months [mean difference = -11.85; 95% CI, -22.85, -0.84; P = .035]). Furthermore, there were no significant differences in clinically meaningful outcomes (P > .05 for all), revision rates (P > .99), or conversion to total hip arthroplasty between cohorts (P > .99). These results held across all sensitivity analyses. CONCLUSIONS Although preoperative paralabral cysts were associated with worse cam impingement and more severe chondral damage observed intraoperatively, they did not predict 2-year functional outcomes or clinically meaningful improvements, suggesting that incidentally discovered paralabral cysts are not a contraindication for arthroscopic labral repair. LEVEL OF EVIDENCE Level III, retrospective cohort study.
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Affiliation(s)
- Michael C Dean
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, U.S.A..
| | - Nathan J Cherian
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, U.S.A.; Department of Orthopaedic Surgery, University of Nebraska, Omaha, Nebraska, U.S.A
| | | | - Christopher T Eberlin
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, U.S.A.; Department of Orthopaedic Surgery, University of Iowa, Iowa City, Iowa, U.S.A
| | - Kaveh A Torabian
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, U.S.A
| | - Kieran S Dowley
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, U.S.A
| | - Zachary L LaPorte
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, U.S.A
| | - Michael P Kucharik
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, U.S.A
| | - Scott D Martin
- Department of Orthopaedic Surgery, Massachusetts General Hospital, Boston, Massachusetts, U.S.A.; Harvard Medical School, Boston, Massachusetts, U.S.A
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Fenn TW, Jan K, Larson JH, Brusalis CM, Nho SJ. Computer-Assisted Arthroscopic Cam Resection. Arthroscopy 2024; 40:1041-1043. [PMID: 38494311 DOI: 10.1016/j.arthro.2024.01.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Accepted: 01/23/2024] [Indexed: 03/19/2024]
Abstract
Determining the appropriate femoral cam resection during hip arthroscopy for femoroacetabular impingement syndrome is both critical for the patient and challenging for the surgeon. Incomplete bone resection is a leading cause of failed hip arthroscopy, whereas over-resection may increase the risk of femoral neck fracture. The alpha angle is a validated 2-dimensional radiographic measurement used to both diagnose femoroacetabular impingement syndrome preoperatively and to determine resection adequacy postoperatively. Computer-assisted intraoperative guidance systems enhance the accuracy of femoral cam resection, although a preoperative 3-dimensional computed tomography scan may be required. Other systems, such as the HipCheck software (Stryker, Kalamazoo, MI), have been developed to provide intraoperative guidance with live feedback using simultaneous alpha angle measurements overlayed on fluoroscopic images without the requirement for routine preoperative computed tomography. Via intraoperative touchscreen navigation, the surgeon identifies the midpoint of the femoral neck and femoral head. A commercial software program provides real-time alpha angle measurements, as well as enhanced visualization of the femoral cam deformity with an adjustable resection curve. Before the surgeon performs the cam resection, the software provides a template for appropriate resection depth in 6 positions of the hip. Upon completion of the femoral cam resection, the hip is again assessed in the same 6 positions and the alpha angle is assessed to ensure a complete resection.
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Affiliation(s)
- Thomas W Fenn
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A..
| | - Kyleen Jan
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A
| | - Jordan H Larson
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A
| | - Christopher M Brusalis
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A
| | - Shane J Nho
- Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A
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Chan JJ, Vogel MJ, Larson JH, Nho SJ. Cartilage Defects Are Negatively Associated With Long-Term Hip Survivorship Following Contemporary Hip Arthroscopy for Femoroacetabular Impingement Syndrome: A Propensity-Matched Analysis at Minimum 10-Year Follow-Up. Arthroscopy 2024:S0749-8063(24)00096-3. [PMID: 38331365 DOI: 10.1016/j.arthro.2024.01.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 01/18/2024] [Accepted: 01/25/2024] [Indexed: 02/10/2024]
Abstract
PURPOSE To identify the timing and risk factors associated with secondary surgery following primary hip arthroscopy for femoroacetabular impingement syndrome (FAIS) at 10-year minimum follow-up. METHODS A prospectively collected clinical repository was evaluated for cases of primary hip arthroscopy for FAIS between January 2012 and February 2013 with minimum 10-year follow-up. Patients who underwent secondary surgery were propensity matched 1:4 to patients who did not undergo secondary surgery, controlling for age, sex, and body mass index (BMI). The groups were compared on demographics, radiographs, intraoperative findings, operative procedures, and patient-reported outcomes. A Kaplan-Meier survivorship curve was generated. Among the reoperation-free survivors, minimal clinically important difference (MCID) and patient acceptable symptom state (PASS) achievement were recorded for Hip Outcome Score-Activities of Daily Living (HOS-ADL), Hip Outcome Score-Sports Specific (HOS-SS) subscales, modified Harris Hip Score (mHHS), 12-item international Hip Outcome Tool (iHOT-12), and Visual Analog Scale for Pain (VAS Pain). RESULTS Twenty-four reoperation patients (67% female; age 40.1 ± 14.3 years; BMI 27.2 ± 5.5) were matched to 96 reoperation-free patients (62% female; age 37.0 ± 10.8 years; BMI 25.2 ± 4.7, P ≥ .111). Mean follow-up was 10.3 ± 0.2 years. No preoperative demographic differences were found between groups. The reoperation group showed more high-grade cartilage defects on the acetabulum and femoral head (33% vs 8%, P = .004; 29% vs 7%, P = .007). A bimodal distribution of time to reoperation was evidenced independent of the secondary surgery performed. Among the reoperation-free survivors, MCID and PASS achievement was as follows: HOS-ADL (69.1%, 62.1%), HOS-SS (69.9%, 74.4%), mHHS (73.3%, 58.1%), iHOT-12 (n/a, 63.8%), and VAS-Pain (80.2%, 62.6%). CONCLUSIONS Patients requiring reoperation following primary hip arthroscopy for FAIS demonstrated more severe cartilage defects and a bimodal distribution of time to reoperation. LEVEL OF EVIDENCE Level III, retrospective comparative case series.
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Affiliation(s)
- Jimmy J Chan
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopaedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, U.S.A
| | - Michael J Vogel
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopaedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, U.S.A..
| | - Jordan H Larson
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopaedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, U.S.A
| | - Shane J Nho
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopaedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, U.S.A
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6
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Dantas P, Gonçalves SR, Grenho A, Mascarenhas V, Martins J, Tavares da Silva M, Gonçalves SB, Guimarães Consciência J. Hip joint contact pressure and force: a scoping review of in vivo and cadaver studies. Bone Joint Res 2023; 12:712-721. [PMID: 38043570 PMCID: PMC10693937 DOI: 10.1302/2046-3758.1212.bjr-2022-0461.r2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/05/2023] Open
Abstract
Aims Research on hip biomechanics has analyzed femoroacetabular contact pressures and forces in distinct hip conditions, with different procedures, and used diverse loading and testing conditions. The aim of this scoping review was to identify and summarize the available evidence in the literature for hip contact pressures and force in cadaver and in vivo studies, and how joint loading, labral status, and femoral and acetabular morphology can affect these biomechanical parameters. Methods We used the PRISMA extension for scoping reviews for this literature search in three databases. After screening, 16 studies were included for the final analysis. Results The studies assessed different hip conditions like labrum status, the biomechanical effect of the cam, femoral version, acetabular coverage, and the effect of rim trimming. The testing and loading conditions were also quite diverse, and this disparity limits direct comparisons between the different researches. With normal anatomy the mean contact pressures ranged from 1.54 to 4.4 MPa, and the average peak contact pressures ranged from 2 to 9.3 MPa. Labral tear or resection showed an increase in contact pressures that diminished after repair or reconstruction of the labrum. Complete cam resection also decreased the contact pressure, and acetabular rim resection of 6 mm increased the contact pressure at the acetabular base. Conclusion To date there is no standardized methodology to access hip contact biomechanics in hip arthroscopy, or with the preservation of the periarticular soft-tissues. A tendency towards improved biomechanics (lower contact pressures) was seen with labral repair and reconstruction techniques as well as with cam correction.
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Affiliation(s)
- Pedro Dantas
- Orthopaedic and Traumatology Center, Hospital CUF Descobertas, Lisbon, Portugal
- Department of Orthopaedic Surgery, Centro Hospitalar Universitário Lisboa Central, Lisbon, Portugal
- NOVA Medical School, Lisbon, Portugal
| | - Sergio R. Gonçalves
- Orthopaedic and Traumatology Center, Hospital CUF Descobertas, Lisbon, Portugal
- Department of Orthopaedic Surgery, Centro Hospitalar Universitário Lisboa Central, Lisbon, Portugal
| | - André Grenho
- Department of Orthopaedic Surgery, Centro Hospitalar Universitário Lisboa Central, Lisbon, Portugal
| | | | - Jorge Martins
- IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
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Jafarnia J, Wininger AE, Holderread BM, Harris JD, Echo A. Acetabular Paralabral Cyst Causing Obturator Nerve Compression in the Setting of Femoroacetabular Impingement Syndrome: A Case Report. JBJS Case Connect 2022; 12:01709767-202212000-00038. [PMID: 36459571 DOI: 10.2106/jbjs.cc.22.00401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 09/01/2022] [Indexed: 12/04/2022]
Abstract
CASE Large acetabular paralabral cysts can cause compression of the surrounding neurovascular structures leading to sensory and motor deficits. We present a 68-year-old man with obturator nerve denervation from a paralabral cyst secondary to a labral tear associated with femoroacetabular impingement syndrome. Resolution of symptoms and return to full activities were achieved at 3 months and maintained beyond 1 year through open cyst excision, obturator neurolysis, arthroscopic femoral osteoplasty, and labral repair in the same surgical setting. The patient had a successful clinical outcome, with pain and dysfunction resolution. CONCLUSION Large paralabral cysts may cause obturator nerve compression, which can be successfully treated with open nerve decompression and arthroscopic treatment of labral pathology.
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Affiliation(s)
- Jordan Jafarnia
- Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas
| | - Austin E Wininger
- Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas
| | - Brendan M Holderread
- Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas
| | - Joshua D Harris
- Department of Orthopedics and Sports Medicine, Houston Methodist Hospital, Houston, Texas
| | - Anthony Echo
- Department of Plastic and Reconstructive Surgery, Houston Methodist Hospital, Houston, Texas
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Alter TD, Knapik DM, Guidetti M, Espinoza A, Chahla J, Nho SJ, Malloy P. Three-Dimensional Quantification of Cam Resection Using MRI Bone Models: A Comparison of 2 Techniques. Orthop J Sports Med 2022; 10:23259671221095417. [PMID: 35547617 PMCID: PMC9083056 DOI: 10.1177/23259671221095417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 02/25/2022] [Indexed: 11/15/2022] Open
Abstract
Background: The current clinical standard for the evaluation of cam deformity in femoroacetabular impingement syndrome is based on radiographic measurements, which limit the ability to quantify the complex 3-dimensional (3D) morphology of the proximal femur. Purpose: To compare magnetic resonance imaging (MRI)–based metrics for the quantification of cam resection as derived using a best-fit sphere alpha angle (BFS-AA) method and using 3D preoperative-postoperative surface model subtraction (PP-SMS). Study Design: Descriptive laboratory study. Methods: Seven cadaveric hemipelvises underwent 1.5-T MRI before and after arthroscopic femoral osteochondroplasty, and 3D bone models of the proximal femur were reconstructed from the MRI scans. The alpha angles were measured radially along clockfaces using a BFS-AA method from the literature and plotted as continuous curves for the pre- and postoperative models. The difference between the areas under the curve for the pre- and postoperative models was then introduced in the current study as the BFS-AA–based metric to quantify the cam resection. The cam resection was also quantified using a 3D PP-SMS method, previously described in the literature using the metrics of surface area (FSA), volume (FV), and height (maximum [FHmax] and mean [FHmean]). Bivariate correlation analyses were performed to compare the metrics quantifying the cam resection as derived from the BFS-AA and PP-SMS methods. Results: The mean ± standard deviation maximum pre- and postoperative alpha angle measurements were 59.73° ± 15.38° and 48.02° ± 13.14°, respectively. The mean for each metric quantifying the cam resection with the PP-SMS method was as follows: FSA, 540.9 ± 150.7 mm2; FV, 1019.2 ± 486.2 mm3; FHmax, 3.6 ± 1.0 mm; and FHmean, 1.8 ± 0.5 mm. Bivariate correlations between the BFS-AA–based and PP-SMS–based metrics were strong: FSA (r = 0.817, P = .012), FV (r = 0.888, P = .004), FHmax (r = 0.786, P = .018), and FHmean (r = 0.679, P = .047). Conclusion: Strong positive correlations were appreciated between the BFS-AA and PP-SMS methods quantifying the cam resection. Clinical Relevance: The utility of the BFS-AA technique is primarily during preoperative planning. The utility of the PP-SMS technique is in the postoperative setting when evaluating the adequacy of resection or in patients with persistent hip pain with suspected residual impingement. In combination, the techniques allow surgeons to develop a planned resection while providing a means to evaluate the depth of resection postoperatively.
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Affiliation(s)
- Thomas D. Alter
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University Medical Center, Chicago, Illinois, USA
- Thomas D. Alter, MS, Department of Orthopedic Surgery, Rush University Medical Center, 1611 W Harrison St, Chicago, IL 60612, USA ()
| | - Derrick M. Knapik
- Division of Sports Medicine, Department of Orthopedic Surgery, Washington University, St Louis, Missouri, USA
| | - Martina Guidetti
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University Medical Center, Chicago, Illinois, USA
| | - Alejandro Espinoza
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University Medical Center, Chicago, Illinois, USA
| | - Jorge Chahla
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University Medical Center, Chicago, Illinois, USA
| | - Shane J. Nho
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University Medical Center, Chicago, Illinois, USA
| | - Philip Malloy
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University Medical Center, Chicago, Illinois, USA
- Arcadia University, Glenside, Pennsylvania, USA
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9
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Guidetti M, Malloy P, Alter TD, Newhouse AC, Espinoza Orías AA, Inoue N, Nho SJ. MRI-- and CT--based metrics for the quantification of arthroscopic bone resections in femoroacetabular impingement syndrome. J Orthop Res 2022; 40:1174-1181. [PMID: 34192370 DOI: 10.1002/jor.25139] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 05/19/2021] [Accepted: 06/09/2021] [Indexed: 02/04/2023]
Abstract
The purpose of this in vitro study was to quantify the bone resected from the proximal femur during hip arthroscopy using metrics generated from magnetic resonance imaging (MRI) and computed tomography (CT) reconstructed three-dimensional (3D) bone models. Seven cadaveric hemi-pelvises underwent both a 1.5 T MRI and CT scan before and following an arthroscopic proximal femoral osteochondroplasty. The images from MRI and CT were segmented to generate 3D proximal femoral surface models. A validated 3D--3D registration method was used to compare surface--to--surface distances between the 3D models before and following surgery. The new metrics of maximum height, mean height, surface area and volume, were computed to quantify bone resected during osteochondroplasty. Stability of the metrics across imaging modalities was established through paired sample t--tests and bivariate correlation. Bivariate correlation analyses indicated strong correlations between all metrics (r = 0.728--0.878) computed from MRI and CT derived models. There were no differences in the MRI- and CT-based metrics used to quantify bone resected during femoral osteochondroplasty. Preoperative- and postoperative MRI and CT derived 3D bone models can be used to quantify bone resected during femoral osteochondroplasty, without significant differences between the imaging modalities.
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Affiliation(s)
- Martina Guidetti
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, USA
| | - Philip Malloy
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, USA.,Department of Physical Therapy, Arcadia University, Glenside, Pennsylvania, USA
| | - Thomas D Alter
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, USA
| | - Alexander C Newhouse
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, USA
| | - Alejandro A Espinoza Orías
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, USA
| | - Nozomu Inoue
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, USA
| | - Shane J Nho
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Rush Medical College of Rush University, Rush University Medical Center, Chicago, Illinois, USA
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Beck EC, Chahla J, Krivicich L, Rasio J, Taylor H, Godbey R, Nho SJ. Intraoperative Automated Radiographic Visualization Tool Allows for Higher Accuracy of Cam Lesion Resection When Used by Novice Surgeons for Arthroscopic Femoroplasty: Lowering the Learning Curve. Arthroscopy 2022; 38:1156-1163. [PMID: 34437944 DOI: 10.1016/j.arthro.2021.08.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Revised: 08/03/2021] [Accepted: 08/10/2021] [Indexed: 02/02/2023]
Abstract
PURPOSE To compare the accuracy of conventional fluoroscopy versus an intraoperative radiographic visualization tool in assisting a novice and experienced hip arthroscopist in comprehensive cam correction to a desired alpha angle (AA). METHODS A cadaveric study was performed using 28 hemi-pelvises with cam-type deformity (AA > 55˚) measured on anteroposterior, lateral, and Dunn-view radiographs. Two fellowship-trained hip arthroscopists each performed 14 arthroscopic femoroplasties. The specimens were randomly assigned: 14 of the procedures were performed by the experienced surgeon, with 7 using the automated radiographic visualization tool (Guided Femoroplasty) and 7 using routine fluoroscopy (Control). The same number of hips was assigned to the novice surgeon, completing 7 femoroplasties with and without the visualization tool. Each hip was imaged before and after femoroplasty in 6 different positions using intraoperative fluoroscopy to evaluate head-neck offset. Femoroplasty AAs were compared between groups with and without visualization tool use, as well as between surgeons. One-way analysis of variance analysis was performed to evaluate the consistency of cam resection. RESULTS For the experienced hip arthroscopist, comparison of Guide Femoroplasty and Control groups resulted in similar accuracy when compared to the controls, with post-femoroplasty AA averages ranging from 41.4° ± 3.8˚ to 44.8° ± 2.8˚ (P = .511) and 40.2° ± 5.3˚ to 45.6° ± 2.2˚ (P = .225), respectively. For the novice hip arthroscopist, the Guided Femoroplasty group had higher accuracy, with post-femoroplasty AA averages ranging from 42.8° ± 2.6˚ to 46.1° ± 7.2˚(P = .689) with and 39.8° ± 3.1˚ to 51.9° ± 8.1˚ (P = .001) without the visualization tool. Comparison of procedure time did not show any statistically significant difference between the use of the radiographic visualization tool and controls for either surgeon (P > .05 for all). CONCLUSIONS Femoroplasty with and without the use of automated radiographic visualization tool results in accurate cam resection when used by both the experienced and novice surgeon. However, higher accuracy was observed when resecting to a desired AA performed by a novice surgeon using the visualization tool. Additionally, use of the visualization tool did not result in longer procedure times for either surgeon. CLINICAL RELEVANCE The impact of incomplete cam resections and over-resection on patient outcomes in the literature has led to the recent development of automated intraoperative radiographic visualization tools that allow for assistance of cam resection accuracy for the treatment of femoroacetabular impingement syndrome. This cadaveric study demonstrates that femoroplasty with the use of an intraoperative automated radiographic visualization tool may result in more accurate cam resections.
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Affiliation(s)
- Edward C Beck
- Department of Orthopedic Surgery, Wake Forest Baptist Health, Winston-Salem, North Carolina, U.S.A..
| | - Jorge Chahla
- Division of Sports Medicine Surgery, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A
| | - Laura Krivicich
- Division of Sports Medicine Surgery, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A
| | - Jonathan Rasio
- Division of Sports Medicine Surgery, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A
| | - Hayley Taylor
- Division of Sports Medicine Surgery, Stryker Corporation, Greenwood Village, Colorado, U.S.A
| | - Ruth Godbey
- Division of Sports Medicine Surgery, Stryker Corporation, Greenwood Village, Colorado, U.S.A
| | - Shane J Nho
- Division of Sports Medicine Surgery, Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois, U.S.A
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Tang HC, Chen IJ, Sadakah M, Wirries N, Dienst M. Preoperative Alpha Angles Can Predict Severity of Acetabular Rim Chondral Damage in Symptomatic Cam-Type Femoroacetabular Impingement: A Prospective Observatory Study. Arthroscopy 2022; 38:1179-1186. [PMID: 34454060 DOI: 10.1016/j.arthro.2021.08.024] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 08/15/2021] [Accepted: 08/15/2021] [Indexed: 02/02/2023]
Abstract
PURPOSE To identify the relationship between the alpha angle and the severity of chondrolabral separation as well as acetabular rim chondral damage in symptomatic cam-type femoroacetabular impingement (FAI) with or without focal pincer-type FAI. METHODS Patients who received hip arthroscopy under the diagnosis of symptomatic cam-type FAI between January 2018 and August 2018 were identified in a prospectively collected database. Patients were excluded if preoperative lateral center-edge angle <25°, lateral center-edge angle ≥40°, Tönnis grade >1, with previous surgery on the affected hip, or with concomitant synovial disease. The chondrolabral junction was classified into intact chondrolabral junction, stable chondrolabral separation and unstable chondrolabral separation. The classification of acetabular rim chondral damage was modified from the MAHORN (Multicenter Arthroscopy of the Hip Outcomes Research Network) classification: normal/softening, bubble, pocket, flap, and exposed bone. The relationship between the hip morphology and severity of chondrolabral junction and acetabular rim chondral damage was assessed. RESULTS A total of 71 patients with the mean age of 33.2 ± 11.0 years were included. Preoperative alpha angles on anteroposterior (AP) or Lauenstein view positively correlated with the severity of acetabular rim chondral damage (P = .028 and P = .016, respectively). A significant increment of the alpha angle between 2 consecutive grades of acetabular rim chondral damage was 7.1° (P = .001) on AP view and 5.2° on Lauenstein view (P = .001). The cut-off values for predicting advanced acetabular rim chondral damage (pocket, flap or bony exposure) were an AP alpha angle of 70° (P = .025) and a Lauenstein alpha angle of 57° (P = .003). There was no significant association between the alpha angle and the severity of chondrolabral separation. CONCLUSIONS In patients with symptomatic cam-type FAI with or without focal pincer-type FAI, greater preoperative alpha angles on AP and Lauenstein views can predict more severe acetabular chondral damage. LEVEL OF EVIDENCE Level III.
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Affiliation(s)
- Hao-Che Tang
- Department of Orthopedic Surgery, Chang Gung Memorial Hospital, Keelung, Taiwan
| | - I-Jung Chen
- Department of Orthopaedic Surgery, Chang Gung Memorial Hospital, Linkou, Taiwan
| | | | - Nils Wirries
- Orthopädische Chirurgie München, Munich, Germany
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Alter TD, Malloy P, Newhouse AC, Suppauksorn S, Orias AE, Chahla J, Inoue N, Nho SJ. Three-Dimensional Measures of Bony Resection During Femoral Osteochondroplasty Are Related to Alpha Angle Measures: A Cadaveric Study. Arthrosc Sports Med Rehabil 2021; 3:e1857-e1863. [PMID: 34977641 PMCID: PMC8689252 DOI: 10.1016/j.asmr.2021.08.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 08/19/2021] [Indexed: 11/29/2022] Open
Abstract
Purpose Methods Results Conclusions Clinical Relevance
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Affiliation(s)
- Thomas D. Alter
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University, Chicago, Illinois
- Address correspondence to Thomas Alter, 1611 W Harrison St, Chicago, IL 60612.
| | - Philip Malloy
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University, Chicago, Illinois
- Department of Physical Therapy, Arcadia University, Pennsylvania, U.S.A
| | - Alex C. Newhouse
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University, Chicago, Illinois
| | - Sunikom Suppauksorn
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University, Chicago, Illinois
| | - Alejandro Espinzoa Orias
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University, Chicago, Illinois
| | - Jorge Chahla
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University, Chicago, Illinois
| | - Nozomu Inoue
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University, Chicago, Illinois
| | - Shane J. Nho
- Section of Young Adult Hip Surgery, Division of Sports Medicine, Department of Orthopedic Surgery, Hip Preservation Center, Rush University, Chicago, Illinois
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Editorial Commentary: Hip Cam Overresection May Result in Inferior Outcomes: The Goldilocks Paradox of Too Little, Too Much, or Just Right? Arthroscopy 2021; 37:2817-2819. [PMID: 34481622 DOI: 10.1016/j.arthro.2021.06.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Accepted: 06/17/2021] [Indexed: 02/02/2023]
Abstract
Femoroacetabular impingement is a recognized source of hip pain and cause of labral and articular cartilage injury. Persistent femoroacetabular impingement has been recognized as a source of inferior patient-reported outcomes, and attempts to define a "normal" α-angle has resulted in more aggressive resection of cam lesions. An overzealous femoroplasty may result in iatrogenic hip instability. A dynamic intraoperative examination may be the best way to truly recognize this problem, in particular, by visualizing the loss of the suction seal, as the cam resection engages the acetabulum, resulting in subluxation. A soft tissue "remplissage" salvage procedure may offer an option to correct cam overresection and improve patient outcomes during revision arthroscopy, as we continue to search for the "right" amount of cam correction to perform.
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Gursoy S, Vadhera AS, Singh H, Perry A, Nho SJ, Chahla J. Intraoperative Guidance for the Surgical Correction of Cam Deformities Using Hip Arthroscopy Based on Alpha Angle Measurement. Arthrosc Tech 2021; 10:e1351-e1360. [PMID: 34141553 PMCID: PMC8185893 DOI: 10.1016/j.eats.2021.01.038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 01/31/2021] [Indexed: 02/03/2023] Open
Abstract
Residual femoroacetabular impingement syndrome due to incomplete resection of a cam deformity is the leading cause of failed hip arthroscopy. The reliability of the alpha angle has been shown for quantifying cam deformities in femoroacetabular impingement syndrome. An intraoperative navigation tool that provides the ability to compare alpha angle measurements side by side on pre- and post-resection fluoroscopic images has recently been introduced. This tool uses fluoroscopic images obtained in 6 different hip positions. The reliability of these standardized hip positions has been shown by correlation with computed tomography in localization and visualization of cam deformities. The purpose of this Technical Note is to give technical tips about the application of this tool.
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Affiliation(s)
| | | | | | | | | | - Jorge Chahla
- Address correspondence to Jorge Chahla, M.D., Ph.D., Department of Orthopaedic Surgery, Rush University Medical Center, 1611 W Harrison St, Ste 300, Chicago, IL 60612, U.S.A.
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Ng KCG, El Daou H, Bankes MJK, Rodriguez Y Baena F, Jeffers JRT. Cam Osteochondroplasty for Femoroacetabular Impingement Increases Microinstability in Deep Flexion: A Cadaveric Study. Arthroscopy 2021; 37:159-170. [PMID: 32927001 DOI: 10.1016/j.arthro.2020.08.037] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Revised: 08/26/2020] [Accepted: 08/29/2020] [Indexed: 02/08/2023]
Abstract
PURPOSE The purpose of this in vitro cadaveric study was to examine the contributions of each surgical stage during cam femoroacetabular impingement (FAI) surgery (i.e., intact-cam hip, T-capsulotomy, cam resection, and capsular repair) toward hip range of motion, translation, and microinstability. METHODS Twelve cadaveric cam hips were denuded to the capsule and mounted onto a robotic tester. The hips were positioned in several flexion positions-full extension, neutral (0°), 30° of flexion, and 90° of flexion-and performed internal-external rotations to 5 Nm of torque in each position. The hips underwent a series of surgical stages (T-capsulotomy, cam resection, and capsular repair) and were retested after each stage. Changes in range of motion, translation, and microinstability (overall translation normalized by femoral head radius) were measured after each stage. RESULTS Regarding range of motion, cam resection increased internal rotation at 90° of flexion (change in internal rotation = +6°, P = .001) but did not affect external rotation. Capsular repair restrained external rotation compared with the cam resection stage (change in external rotation = -8° to -4°, P ≤ .04). In terms of translation, the hip translated after cam resection at 90° of flexion in the medial-lateral plane (change in translation = +1.9 mm, P = .04) relative to the intact and capsulotomy stages. Regarding microinstability, capsulotomy increased microinstability in 30° of flexion (change in microinstability [ΔM] = +0.05, P = .003), but microinstability did not further increase after cam resection. At 90° of flexion, microinstability did not increase after capsulotomy (ΔM = +0.03, P = .2) but substantially increased after cam resection (ΔM = +0.08, P = .03), accounting for a 31% change with respect to the intact stage. CONCLUSIONS Cam resection increased microinstability by 31% during deep hip flexion relative to the intact hip. This finding suggests that iatrogenic microinstability may be due to separation of the labral seal and resected contour of the femoral head. CLINICAL RELEVANCE Our in vitro study showed that, at time zero and prior to postoperative recovery, excessive motion after cam resection could disrupt the labral seal. Complete cam resection should be performed cautiously to avoid disruption of the labral seal and postoperative microinstability.
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Affiliation(s)
- K C Geoffrey Ng
- MSk Lab, Department of Surgery and Cancer, Imperial College London, London, England; Department of Mechanical Engineering, Imperial College London, London, England.
| | - Hadi El Daou
- Department of Mechanical Engineering, Imperial College London, London, England
| | - Marcus J K Bankes
- Department of Orthopaedics, Guy's and St. Thomas' NHS Foundation Trust, London, England; Fortius Clinic, London, England
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