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Gherghel R, Onu I, Iordan DA, Antohe BA, Rezus II, Alexa O, Macovei LA, Rezus E. A New Approach to Postoperative Rehabilitation following Mosaicplasty and Bone Marrow Aspiration Concentrate (BMAC) Augmentation. Biomedicines 2024; 12:1164. [PMID: 38927371 PMCID: PMC11200487 DOI: 10.3390/biomedicines12061164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 04/27/2024] [Accepted: 05/22/2024] [Indexed: 06/28/2024] Open
Abstract
BACKGROUND Chondral defects in the knee present a significant challenge due to their limited self-healing capacity, often leading to joint degeneration and functional disability. Current treatments, including surgical approaches like mosaicplasty and regenerative therapies such as bone marrow aspirate concentrate (BMAC) augmentation, aim to address these defects and improve patient outcomes. MATERIALS AND METHODS This study conducted a single-center, randomized controlled trial to evaluate the efficacy of different treatment approaches and rehabilitation protocols for chondral defects. Thirty-seven subjects presenting with symptomatic chondral or osteochondral defects (>3 cm2) in the weight-bearing region of the femoral condyle were partitioned into three groups, and underwent mosaicplasty with or without BMAC augmentation, followed by either a 6-week or 12-week rehabilitation program. Group 1 (n = 10) received mosaicplasty combined with BMAC augmentation and engaged in a twelve-week two-phase rehabilitation protocol. Group 2 (n = 15) underwent mosaicplasty alone and participated in the same twelve-week two-phase rehabilitation regimen. Meanwhile, Group 3 (n = 12) underwent mosaicplasty and underwent a shorter six-week one-phase rehabilitation program. Clinical assessments were performed using the visual analog scale (VAS) for pain, goniometry for the knee's range of motion (ROM), manual muscle testing (MMT) for quadricep strength, and the Western Ontario and McMaster University Arthritis Index (WOMAC) for functional evaluation in three test phases. RESULTS Significant differences in WOMAC scale scores were observed between the three groups at the intermediate (F(2, 34) = 5.24, p < 0.010) and final (F(2, 34) = 111, p < 0.000) stages, with post hoc Tukey tests revealing variations shared among all three groups. The between-group analysis of the VAS scale demonstrated no statistically significant difference initially (F(2, 34) = 0.18, p < 0.982), but significant differences emerged following the intermediate (F(2, 34) = 11.40, p < 0.000) and final assessments (F(2, 34) = 59.87, p < 0.000), with post hoc Tukey tests revealing specific group variations, notably between Group 1 and both Group 2 and Group 3, and also between Group 3 and Group 2. The between-group analysis of quadricep muscle strength using MMT scores revealed no statistically significant differences initially (F(2, 34) = 0.376, p < 0.689) or following the intermediate assessment (F(2, 34) = 2.090, p < 0.139). The one-way ANOVA analysis showed no significant difference in the knee ROM initially (F(2, 34) = 1.037, p < 0.366), but significant differences emerged following intermediate (F(2, 34) = 9.38, p < 0.001) and final assessments (F(2, 34) = 11.60, p < 0.000). Post hoc Tukey tests revealed significant differences between Groups 1 and 2, Groups 1 and 3, and Groups 2 and 3 at intermediate and final assessments. CONCLUSIONS The patients who received BMAC augmentation and completed a 12-week rehabilitation protocol had significantly better outcomes in pain relief, knee function, and ROM when compared to those who did not receive BMAC augmentation or those who completed a shorter rehabilitation period. Our findings suggest that combining mosaicplasty with BMAC augmentation and a comprehensive rehabilitation program can lead to superior clinical outcomes for patients with chondral defects in the knee.
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Affiliation(s)
- Robert Gherghel
- Department of Orthopedics and Trauma Surgery, Piatra Neamt Emergency Hospital, 700115 Piatra Neamt, Romania;
- Departments of Orthopedy and Physiotherapy, Medlife-Micromedica Clinic, 610119 Piatra Neamt, Romania
| | - Ilie Onu
- Departments of Orthopedy and Physiotherapy, Medlife-Micromedica Clinic, 610119 Piatra Neamt, Romania
- Department of Biomedical Sciences, Faculty of Medical Bioengineering, University of Medicine and Pharmacy “Grigore T. Popa” Iasi, 700454 Iasi, Romania
- Center of Physical Therapy and Rehabilitation, “Dunărea de Jos” University of Galati, 800008 Galati, Romania;
| | - Daniel Andrei Iordan
- Center of Physical Therapy and Rehabilitation, “Dunărea de Jos” University of Galati, 800008 Galati, Romania;
- Department of Individual Sports and Kinetotherapy, Faculty of Physical Education and Sport, “Dunarea de Jos” University of Galati, 800008 Galati, Romania
| | - Bogdan Alexandru Antohe
- Department of Physical and Occupational Therapy, “Vasile Alecsandri” University of Bacau, 600115 Bacau, Romania;
| | - Ioana-Irina Rezus
- Department of Dermatology, Faculty of Medicine, “Grigore T. Popa” University of Medicine and Pharmacy Iasi, 700115 Iasi, Romania;
| | - Ovidiu Alexa
- Department of Orthopaedic and Traumatology, Faculty of Medicine, “Grigore T. Popa” University of Medicine and Pharmacy of Iasi, 700115 Iasi, Romania;
| | - Luana Andreea Macovei
- Department of Rheumatology and Rehabilitation, Faculty of Medicine, “Grigore T. Popa” University of Medicine and Pharmacy Iasi, 700115 Iasi, Romania;
| | - Elena Rezus
- Department of Rheumatology and Rehabilitation, Faculty of Medicine, “Grigore T. Popa” University of Medicine and Pharmacy Iasi, 700115 Iasi, Romania;
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Niethammer TR, Aurich M, Brucker PU, Faber S, Diemer F, Pietschmann MF, Schoch W, Zinser W, Müller PE. Follow-up Treatment after Cartilage Therapy of the Knee Joint - a Recommendation of the DGOU Clinical Tissue Regeneration Working Group. ZEITSCHRIFT FUR ORTHOPADIE UND UNFALLCHIRURGIE 2024. [PMID: 38224697 DOI: 10.1055/a-2206-7242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2024]
Abstract
The first follow-up treatment recommendation from the DGOU's Clinical Tissue Regeneration working group dates back to 2012. New scientific evidence and changed framework conditions made it necessary to update the follow-up treatment recommendations after cartilage therapy.As part of a multi-stage member survey, a consensus was reached which, together with the scientific evidence, provides the basis for the present follow-up treatment recommendation.The decisive criterion for follow-up treatment is still the defect localisation. A distinction is made between femorotibial and patellofemoral defects. In addition, further criteria regarding cartilage defects are now also taken into account (stable cartilage edge, location outside the main stress zone) and the different methods of cartilage therapy (e. g. osteochondral transplantation, minced cartilage) are discussed.The present updated recommendation includes different aspects of follow-up treatment, starting with early perioperative management through to sports clearance and resumption of contact sports after cartilage therapy has taken place.
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Affiliation(s)
- Thomas R Niethammer
- Muskuloskelettales Universitätszentrum München (MUM), Klinik für Orthopädie und Unfallchirurgie, Klinikum der Universität München, LMU München, München, Deutschland
| | - Matthias Aurich
- Department für Orthopädie, Unfall- und Wiederherstellungschirurgie, Universitätsklinikum Halle (Saale), Halle, Deutschland
- Klinik für Unfall- und Wiederherstellungschirurgie, BG Klinikum Bergmannstrost, Halle (Saale), Deutschland
| | - Peter U Brucker
- ATOS Klinik München, München, Deutschland
- Biomechanik im Sport, Fakultät für Sport- und Gesundheitswissenschaft, Technische Universität München, München
| | - Svea Faber
- Muskuloskelettales Universitätszentrum München (MUM), Klinik für Orthopädie und Unfallchirurgie, Klinikum der Universität München, LMU München, München, Deutschland
| | | | - Matthias F Pietschmann
- Muskuloskelettales Universitätszentrum München (MUM), Klinik für Orthopädie und Unfallchirurgie, Klinikum der Universität München, LMU München, München, Deutschland
- OrthoPraxis Oberhaching, Oberhaching
| | | | - Wolfgang Zinser
- Orthoexpert, Knittelfeld, Österreich
- Metagil Physikalisches Ambulatorium, Knittelfeld, Österreich
| | - Peter E Müller
- Muskuloskelettales Universitätszentrum München (MUM), Klinik für Orthopädie und Unfallchirurgie, Klinikum der Universität München, LMU München, München, Deutschland
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Krueger DR, Baur ADJ, Perka C, Schroeder JH. Injectable autologous chondrocyte implantation in acetabular cartilage defects: 2-year minimum clinical and MRI results. Arch Orthop Trauma Surg 2023; 143:739-747. [PMID: 34468836 DOI: 10.1007/s00402-021-04141-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2021] [Accepted: 08/21/2021] [Indexed: 11/30/2022]
Abstract
INTRODUCTION Early results using injectable autologous chondrocyte implantation (ACI) for the treatment of full thickness acetabular cartilage defects have been promising. However, so far there is no information on radiological results after injectable ACI using spheroids. The purpose of this sturdy was to (1) investigate the quality of tissue repair on MRI and (2) investigate the correlation between the MRI results and clinical results at a minimum follow-up of 24 months after third generation ACI in full thickness acetabular cartilage defects. It was hypothesized that ACI shows good MRI results in patients with large full thickness acetabular cartilage defects 24 months after surgery. It was also hypothesized that there is a correlation between postoperative clinical and MRI morphological results at a minimum follow-up of 24 months. STUDY DESIGN Retrospective case series. MATERIALS AND METHODS Patients with ACI for full thickness acetabular cartilage defects > 2 cm2 were evaluated by preoperative and postoperative clinical scoring tools including the modified Harris Hip Score (mHHS), the International Hip Outcome Tool (iHOT-33), and the Subjective Hip Value (SHV) as well as a high resolution indirect arthro-MRI 24 months after surgery utilizing an identical imaging protocol for all patients. The magnetic resonance observation of cartilage repair tissue (MOCART) scoring system was used to classify the repair tissue on MRI. Demographic patient data was evaluated for influencing factors for pre- and postoperative clinical as well as radiological results. RESULTS Thirty six consecutive patients (5 women/31 men, average age 32.9 years) had undergone two stage ACI procedure. The average size of the cartilage defect was 5.0 (2-6) cm2. The average follow-up was 29.9 (24-42) months. Four patients were not available for the final follow-up (follow-up rate 89%). The postoperative average MOCART score was 82.2 (± 14.2). MOCART score showed medium correlation of the item defect fill and the postoperative mHHS (r = 0.384, p = 0.043). There was no correlation of the other items or the total score with postoperative results. The patients showed significant improvement in the outcome measurements between preoperative and postoperative in the mHHS, the iHOT-33, and the SHV. CONCLUSIONS Despite the large acetabular cartilage defects included in this study, ACI showed good MRI results with complete defect fill in 87.5% after a minimum 24-month follow-up. Statistically significant correlation of MRI and clinical results could only be seen with the item defect fill. Further research with longer follow-up is needed to evaluate the long-term results of ACI in acetabular cartilage defects.
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Affiliation(s)
- David R Krueger
- Department of Orthopedic Surgery, Herzogin Elisabeth Hospital, Leipziger Str. 24, 38124, Braunschweig, Germany.
| | - Alexander D J Baur
- Departments of Radiology, Campus Virchow, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Carsten Perka
- Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Joerg H Schroeder
- Department of Trauma and Orthopaedic Surgery, BG Klinikum Unfallkrankenhaus Berlin, Berlin, Germany
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Brockmeyer M, Madry H. Produkte für die autologe Chondrozytentransplantation. ARTHROSKOPIE 2022. [DOI: 10.1007/s00142-022-00557-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
Cartilage damage is often associated with pain, reduced quality of life and decreased physical performance. In addition, even small cartilage lesions can lead to osteoarthritis. Since young active people are particularly affected, the correct treatment of cartilage damage plays an important role. Operative treatment includes bone marrow-stimulating procedures with or without a matrix, cell-based procedures and osteochondral graft transplantation. The choice of the best procedure depends on the localization, the size and the extent of the cartilage damage. In addition, especially in the treatment of cartilage damage to the lower limbs, the leg axis and loading relationships should be taken into account and possibly treated as well as additional joint instabilities. The following article gives an overview of the available surgical treatment possibilities as well as the correct indications and implementation. It also gives a brief projection of possible further treatment options associated with stem cells.
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Affiliation(s)
- A Rauch
- Sporttraumatologie und Kniechirurgie an der ATOS Klinik München, ECOM - Excellent Center of Medicine, Arabellastr. 17, 81925, München, Deutschland.
| | - E Rembeck
- Sporttraumatologie und Kniechirurgie an der ATOS Klinik München, ECOM - Excellent Center of Medicine, Arabellastr. 17, 81925, München, Deutschland
| | - L Kohn
- Klinik für Unfallchirurgie und Orthopädie, Krankenhaus Landshut Achdorf, Landshut, Deutschland
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Niemeyer P, Albrecht D, Andereya S, Angele P, Ateschrang A, Aurich M, Baumann M, Bosch U, Erggelet C, Fickert S, Gebhard H, Gelse K, Günther D, Hoburg A, Kasten P, Kolombe T, Madry H, Marlovits S, Meenen NM, Müller PE, Nöth U, Petersen JP, Pietschmann M, Richter W, Rolauffs B, Rhunau K, Schewe B, Steinert A, Steinwachs MR, Welsch GH, Zinser W, Fritz J. Autologous chondrocyte implantation (ACI) for cartilage defects of the knee: A guideline by the working group "Clinical Tissue Regeneration" of the German Society of Orthopaedics and Trauma (DGOU). Knee 2016; 23:426-35. [PMID: 26947215 DOI: 10.1016/j.knee.2016.02.001] [Citation(s) in RCA: 138] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 01/13/2016] [Accepted: 02/01/2016] [Indexed: 02/02/2023]
Abstract
BACKGROUND Autologous chondrocyte implantation (ACI) is an established and well-accepted procedure for the treatment of localised full-thickness cartilage defects of the knee. METHODS The present review of the working group "Clinical Tissue Regeneration" of the German Society of Orthopaedics and Trauma (DGOU) describes the biology and function of healthy articular cartilage, the present state of knowledge concerning therapeutic consequences of primary cartilage lesions and the suitable indication for ACI. RESULTS Based on best available scientific evidence, an indication for ACI is given for symptomatic cartilage defects starting from defect sizes of more than three to four square centimetres; in the case of young and active sports patients at 2.5cm(2), while advanced degenerative joint disease needs to be considered as the most important contraindication. CONCLUSION The present review gives a concise overview on important scientific background and the results of clinical studies and discusses the advantages and disadvantages of ACI. LEVEL OF EVIDENCE Non-systematic Review.
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Affiliation(s)
- P Niemeyer
- Department Orthopädie und Traumatologie, Universitätsklinikum Freiburg, Germany.
| | - D Albrecht
- Klinik im Kronprinzenbau, Reutlingen, Germany
| | - S Andereya
- Orthopädie und Unfallchirurgie, Ortho AC, Aachen, Germany
| | - P Angele
- Abteilung für Unfallchirurgie, Universitätsklinikum Regensburg, Germany; Sportopaedicum, Straubing, Berlin, Regensburg, München, Germany
| | - A Ateschrang
- Berufsgenossenschaftliche Unfallklinik Tübingen, Germany
| | - M Aurich
- Kliniken Leipziger Land GmbH, Klinikum Borna, Germany
| | - M Baumann
- Kreiskliniken Esslingen, Klinik f. Unfallchirurgie - Orthopädische Chirurgie, Esslingen, Germany
| | - U Bosch
- Zentrum f. Orthopädische Chirurgie, Sporttraumatologie, INI Hannover, Germany
| | - C Erggelet
- Center of Biologie Joint Repair, Zürich, Switzerland
| | - S Fickert
- Sportopaedicum, Straubing, Berlin, Regensburg, München, Germany
| | - H Gebhard
- Abteilung für Unfallchirurgie, Universitätsklinikum Regensburg, Germany
| | - K Gelse
- Abteilung für Unfallchirurgie, Universitätsklinikum Erlangen, Germany
| | - D Günther
- Klinik für Unfallchirurgie, Medizinische Hochschule Hannover (MHH), Germany
| | - A Hoburg
- Universitätsmedizin Berlin-Charite, Klinik für Orthopädie, Unfall u. Wiederherstellungschirurgie, Germany
| | - P Kasten
- Orthopädisch Chirurgisches Centrum, Tübingen, Germany
| | - T Kolombe
- Unfallchirurgie/Orthopädie, DRK Krankenhaus Luckenwalde, Germany
| | - H Madry
- Zentrum für Experimentelle Orthopädie, Universitätsklinikum des Saarlandes, Homburg, Germany
| | - S Marlovits
- Universitätsklinik für Unfallchirurgie, Medizinische Universität Wien und Austrian Cluster for Tissue Regeneration, Austria
| | - N M Meenen
- Sektion Pädiatrische Sportmedizin, Kinderorthopädie, Altonaer Kinderkrankenhaus Hamburg, Germany
| | - P E Müller
- Orthopädische Klinik, Ludwig-Maximiliams-Universität München, Germany
| | - U Nöth
- Evangelisches Waldkrankenhaus Spandau, Klinik f. Orthopädie und Unfallchirurgie, Berlin, Germany
| | - J P Petersen
- Zentrum f. operative Medizin, Klinik für Unfall-, Hand- u. Wiederherstellungschirurgie, Universitätsklinikum Hamburg-Eppendorf, Germany
| | - M Pietschmann
- Orthopädische Klinik, Ludwig-Maximiliams-Universität München, Germany
| | - W Richter
- Forschungszentrum für Experimentelle Orthopädie, Universitätsklinikum Heidelberg, Germany
| | - B Rolauffs
- Berufsgenossenschaftliche Unfallklinik Tübingen, Germany
| | | | - B Schewe
- Orthopädisch Chirurgisches Centrum, Tübingen, Germany
| | - A Steinert
- Orthopädische Klinik, König-Ludwig-Haus, Universität Würzburg, Germany
| | | | | | - W Zinser
- Klinik für Orthopädie und Unfallchirurgie, St. Vinzenz-Hospital Dinslaken, Germany
| | - J Fritz
- Orthopädisch Chirurgisches Centrum, Tübingen, Germany
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Niethammer TR, Valentin S, Gülecyüz MF, Roßbach BP, Ficklscherer A, Pietschmann MF, Müller PE. Bone Marrow Edema in the Knee and Its Influence on Clinical Outcome After Matrix-Based Autologous Chondrocyte Implantation: Results After 3-Year Follow-up. Am J Sports Med 2015; 43:1172-9. [PMID: 25784628 DOI: 10.1177/0363546515573935] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Third-generation autologous chondrocyte implantation (ACI) is an established method for treatment of full-thickness cartilage defects in the knee joint. Subchondral bone marrow edema (BME) is frequently observed after ACI, with unknown pathogenesis and clinical relevance. PURPOSE To investigate the occurrence and clinical relevance of BME after third-generation ACI in the knee joint during the postoperative course of 36 months. STUDY DESIGN Cohort study; Level of evidence, 3. METHODS A total of 38 circumscribed full-thickness cartilage defects in 30 patients were included in this study. All defects were treated with third-generation ACI (Novocart 3D). A standardized MRI examination was carried out after 1.5, 3, 6, 12, 24, and 36 months. Bone marrow edema was observed in 78.9% of defects over the postoperative course, with initial occurrence in the first 12 months. The size of the BMEs were determined according to their maximum diameter and were classified as small (<1 cm), medium (<2 cm), large (<4 cm), and very large (diffuse; >4 cm). Clinical outcomes in patients were analyzed by use of the International Knee Documentation Committee (IKDC) scoring system and a visual analog scale for pain. RESULTS There were 5.3% (n=2) small, 28.9% (n=11) medium, 34.2% (n=13) large, and 10.5% (n=4) very large BMEs. In a subgroup analysis, cartilage defects of the medial femoral condyle showed significantly higher frequency of BME than did patellar defects. Clinical scores showed significant improvements throughout the entire study course (P<.05). Clinical patient outcome did not correlate with presence of BME at any time period (P>.05). CONCLUSION Midterm clinical results of the matrix-based third-generation ACI showed a substantial amount of BME over a 36-month follow-up, but this did not correlate with worse clinical outcome. Patients with femoral cartilage defects were more often affected than were those with patellar cartilage defects.
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Affiliation(s)
- Thomas R Niethammer
- Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich, Munich, Germany
| | - Siegfried Valentin
- Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich, Munich, Germany
| | - Mehmet F Gülecyüz
- Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich, Munich, Germany
| | - Björn P Roßbach
- Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich, Munich, Germany
| | - Andreas Ficklscherer
- Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich, Munich, Germany
| | - Matthias F Pietschmann
- Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich, Munich, Germany
| | - Peter E Müller
- Department of Orthopaedic Surgery, Physical Medicine and Rehabilitation, University Hospital of Munich, Munich, Germany
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Salzmann GM, Niemeyer P, Vogt S, Kreuz P, Arnold M, Fritz J, Mujeeb A, Rosenberger R, Steinwachs M, Angele P. Practical execution of defect preparation prior to surgical cartilage intervention: results from a representative meeting survey among experts. SPRINGERPLUS 2015; 4:682. [PMID: 27385105 PMCID: PMC4637330 DOI: 10.1186/s40064-015-1451-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 10/19/2015] [Indexed: 11/24/2022]
Abstract
During a specialised orthopedic meeting held on ‘the state of the art in cartilage defect repair’, all previously fully-registered participants were requested to participate in an electronic survey by the use of a moderator-presented “Power Point Presentation-based” 9-item questionnaire. The aim of this survey was to assess indication, approach, and treatment execution of cartilage defect debridement prior to planned microfracture (MFX) or autologous chondrocyte implantation (ACI). All participants completed the questionnaire (n = 146) resulting in a return rate of 100 %. An uncertainty exists as to whether the removal of the calcifying layer prior to cartilage repair must be carried out or not. The same was true for the acceptability of subchondral bleeding prior to microfracturing and its handling prior to autologous chondrocyte implantation. There is a degree of unanimity among experts regarding the management of osteophytes and bone marrow edema. In a homogenous society collective of consultants that frequently deal with cartilage defective pathologies, there still remain a significant heterogeneity in selected topics of defect debridement.
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Affiliation(s)
- Gian M Salzmann
- Department of Orthopaedic Surgery, Schulthess Clinic, Lengghalde 2, 8008 Zurich, Switzerland
| | - Philipp Niemeyer
- Department of Orthopedics and Trauma Surgery, Albert-Ludwigs University Medical Center Freiburg, 79106 Freiburg, Germany
| | | | - Peter Kreuz
- Orthopädie, Uniklinik Rostock, Rostock, Germany
| | | | | | - Ayeesha Mujeeb
- Department of Biomedical Engineering, College of Engineering, Peking University, 100871 Beijing, China
| | | | | | - Peter Angele
- Department of Trauma Surgery, University Medical Center Regensburg, Franz Josef Strauß Allee 11, 93042 Regensburg, Germany
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