Buchhorn, Gottfried Hans

[["dc.bibliographiccitation.firstpage","992"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Knee Surgery Sports Traumatology Arthroscopy"],["dc.bibliographiccitation.lastpage","998"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Baums, Mike Herbert"],["dc.contributor.author","Geyer, Michael"],["dc.contributor.author","Bueschken, Meike"],["dc.contributor.author","Buchhorn, Gottfried Hans"],["dc.contributor.author","Spahn, Gunter"],["dc.contributor.author","Klinger, Hans-Michael"],["dc.date.accessioned","2018-11-07T08:41:52Z"],["dc.date.available","2018-11-07T08:41:52Z"],["dc.date.issued","2010"],["dc.description.abstract","The aim of the study was to evaluate the time-zero mechanical and footprint properties of a suture-bridge technique for rotator cuff repair in an animal model. Thirty fresh-frozen sheep shoulders were randomly assigned among three investigation groups: (1) cyclic loading, (2) load-to-failure testing, and (3) tendon-bone interface contact pressure measurement. Shoulders were cyclically loaded from 10 to 180 N and displacement to gap formation of 5- and 10-mm at the repair site. Cycles to failure were determined. Additionally, the ultimate tensile strength and stiffness were verified along with the mode of failure. The average contact pressure and pressure pattern were investigated using a pressure-sensitive film system. All of the specimens resisted against 3,000 cycles and none of them reached a gap formation of 10 mm. The number of cycles to 5-mm gap formation was 2,884.5 +/- A 96.8 cycles. The ultimate tensile strength was 565.8 +/- A 17.8 N and stiffness was 173.7 +/- A 9.9 N/mm. The entire specimen presented a unique mode of failure as it is well known in using high strength sutures by pulling them through the tendon. We observed a mean contact pressure of 1.19 +/- A 0.03 MPa, applied on the footprint area. The fundamental results of our study support the use of a suture-bridge technique for optimising the conditions of the healing biology of a reconstructed rotator cuff tendon. Nevertheless, an individual estimation has to be done if using the suture-bridge technique clinically. Further investigation is necessary to evaluate the cell biological healing process in order to achieve further sufficient advancements in rotator cuff repair."],["dc.identifier.doi","10.1007/s00167-009-0941-7"],["dc.identifier.isi","000278931500027"],["dc.identifier.pmid","19826786"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/4969"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19563"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0942-2056"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Tendon-bone contact pressure and biomechanical evaluation of a modified suture-bridge technique for rotator cuff repair"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","106"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Clinical Biomechanics"],["dc.bibliographiccitation.lastpage","111"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Klinger, Hans-Michael"],["dc.contributor.author","Steckel, Hanno"],["dc.contributor.author","Spahn, Gunter"],["dc.contributor.author","Buchhorn, Gottfried Hans"],["dc.contributor.author","Baums, Mike Herbert"],["dc.date.accessioned","2018-11-07T11:06:16Z"],["dc.date.available","2018-11-07T11:06:16Z"],["dc.date.issued","2007"],["dc.description.abstract","Background. In recent studies objective evaluations have demonstrated that arthroscopic rotator cuff repairs can have higher failure rates than open repairs. Thus, there is a need for a stronger tissue-holding stitch for arthroscopical repair. The purpose of this study was to compare the biomechanical properties of traditional open transosseous suture technique and modified Mason-Allen stitches versus double-loaded suture anchors and arthroscopic Mason-Allen stitches in rotator cuff repair. Methods. In 20 sheep shoulders the infraspinatus tendons were dissected from their insertion and were randomized to 2 repair groups: (1) repair with transosseous suture and modified Mason-Allen stitches, (2) repair with double loaded bioabsorbable suture anchors and arthroscopic Mason-Allen stitches: Both groups were coupled with braided, nonabsorbable polyester (Ethibond) suture sized USP No. 2. All repairs were cyclically loaded from 10 to 180 N with the use of a materials testing machine. The number of cycles to gap formation of 5 and 10 rum at the repair site and the mode of failure were recorded. Results. The number of cycles to 5-mm gap was mean 634 (SD 106) for group 1 and mean 750 (SD 107) for group 2 (P < 0.026). The corresponding values to 10-mm, gap were mean 1573 (SD 161) for group 1, and mean 1789 (SD 183 cycles) for group 2 (P < 0.012). In group 2 the mode of failure occurred by tissue pull-out, whereas in group 1 the failure occurred by a mixture of suture breakage and pull-out. Conclusions. This time-zero study demonstrates that the combination of bioabsorbable suture anchors and arthroscopic Mason-Allen stitches provides strength superior to that of the modified Mason-Allen transosseous suture technique under isometric cyclic loading conditions. However, additional evaluation is needed to examine the effects on the sustained strength of the repair throughout the healing process. (c) 2006 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.clinbiomech.2006.07.009"],["dc.identifier.isi","000243680700015"],["dc.identifier.pmid","16996666"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/52266"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Sci Ltd"],["dc.relation.issn","0268-0033"],["dc.title","Biomechanical comparison of double-loaded suture anchors using arthroscopic Mason-Allen Stitches versus traditional transosseous suture technique and modified Mason-Allen stitches for rotator cuff repair"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","291"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Clinical Biomechanics"],["dc.bibliographiccitation.lastpage","298"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Klinger, Hans-Michael"],["dc.contributor.author","Buchhorn, Gottfried Hans"],["dc.contributor.author","Heidrich, Gabert"],["dc.contributor.author","Kahl, Enrico"],["dc.contributor.author","Baums, Mike Herbert"],["dc.date.accessioned","2018-11-07T11:17:25Z"],["dc.date.available","2018-11-07T11:17:25Z"],["dc.date.issued","2008"],["dc.description.abstract","Background. The optimal method for rotator cuff repair of the shoulder is not yet known. The aim of this study was to compare the time-dependent biomechanical properties of the traditional open transosseous suture technique and modified Mason-Allen stitches (group 1) versus the double-loaded suture anchors technique and so-called arthroscopic Mason-Allen stitches (group 2) in rotator cuff repair. Methods. Eighteen adult female sheep were randomized into two groups: in an open approach in which the released infraspinatus tendon was repaired with group 1, and with group 2. Animals were sacrificed at 6, 12, or 26 weeks; shoulders were harvested and magnetic resonance imaging was performed. Eight untreated contralateral shoulders served as controls. Tendons of 16 additional unpaired cadaver shoulder joints of adult female sheep were identically treated for analysis at time zero. In a biomechanical evaluation all specimens were loaded to failure at a constant displacement rate using a standard universal testing machine. The load-to-failure and stiffness of the healed bone-tendon interface were calculated. Results. Magnetic resonance imaging analysis showed cuff integrity in all cases, and no evidence of foreign body reaction to the anchors. Load-to-failure and stiffness data did not indicate any significant difference between the two treatment groups, neither at 6 weeks nor at 12 or 26 weeks. However, at time zero the group 2 had a higher load-to-failure in comparison to the group 1 (P < 0.010), but there was no difference for the stiffness (P < 0.121). Conclusions. This in vivo study showed that, postoperatively, the group 2 technique provides superior stability and after healing would gain strength comparable to the group I technique. (C) 2007 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.clinbiomech.2007.10.010"],["dc.identifier.isi","000254792800005"],["dc.identifier.pmid","18063457"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54801"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Sci Ltd"],["dc.relation.issn","0268-0033"],["dc.title","Biomechanical evaluation of rotator cuff repairs in a sheep model: Suture anchors using arthroscopic Mason-Allen stitches compared with transosseous sutures using traditional modified Mason-Allen stitches"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1193"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","Archives of Orthopaedic and Trauma Surgery"],["dc.bibliographiccitation.lastpage","1199"],["dc.bibliographiccitation.volume","130"],["dc.contributor.author","Baums, Mike Herbert"],["dc.contributor.author","Buchhorn, Gottfried Hans"],["dc.contributor.author","Gilbert, Fabian"],["dc.contributor.author","Spahn, Gunter"],["dc.contributor.author","Schultz, Wolfgang"],["dc.contributor.author","Klinger, H-M"],["dc.date.accessioned","2018-11-07T08:39:29Z"],["dc.date.available","2018-11-07T08:39:29Z"],["dc.date.issued","2010"],["dc.description.abstract","This experimental study aimed to compare the load-to-failure rate and stiffness of single- versus double-row suture techniques for repairing rotator cuff lesions using two different suture materials. Additionally, the mode of failure of each repair was evaluated. In 32 sheep shoulders, a standardized tear of the infraspinatus tendon was created. Then, n = 8 specimen were randomized to four repair methods: (1) Double-row Anchor Ethibond(A (R)) coupled with polyester sutures, USP No. 2; (2) Double-Row Anchor HiFi(A (R)) with polyblend polyethylene sutures, USP No. 2; (3) Single-Row Anchor Ethibond(A (R)) coupled with braided polyester sutures, USP No. 2; and (4) Single-Row Anchor HiFi(A (R)) with braided polyblend polyethylene sutures, USP No. 2. Arthroscopic Mason-Allen stitches were placed (single-row) and combined with medial horizontal mattress stitches (double-row). All specimens were loaded to failure at a constant displacement rate on a material testing machine. Group 4 showed lowest load-to-failure result with 155.7 +/- A 31.1 N compared to group 1 (293.4 +/- A 16.1 N) and group 2 (397.7 +/- A 7.4 N) (P < 0.001). Stiffness was highest in group 2 (162 +/- A 7.3 N/mm) and lowest in group 4 (84.4 +/- A 19.9 mm) (P < 0.001). In group 4, the main cause of failure was due to the suture cutting through the tendon (n = 6), a failure case observed in only n = 1 specimen in group 2 (P < 0.001). A double-row technique combined with arthroscopic Mason-Allen/horizontal mattress stitches provides high initial failure strength and may minimize the risk of the polyethylene sutures cutting through the tendon in rotator cuff repair when a single load force is used."],["dc.identifier.doi","10.1007/s00402-009-1036-0"],["dc.identifier.isi","000281171400018"],["dc.identifier.pmid","20049605"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/5156"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/19006"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0936-8051"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Initial load-to-failure and failure analysis in single- and double-row repair techniques for rotator cuff repair"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1052"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Knee Surgery Sports Traumatology Arthroscopy"],["dc.bibliographiccitation.lastpage","1060"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Baums, Mike Herbert"],["dc.contributor.author","Buchhorn, Gottfried Hans"],["dc.contributor.author","Spahn, Gunter"],["dc.contributor.author","Poppendieck, B."],["dc.contributor.author","Schultz, Wolfgang"],["dc.contributor.author","Klinger, H.-M."],["dc.date.accessioned","2018-11-07T11:09:36Z"],["dc.date.available","2018-11-07T11:09:36Z"],["dc.date.issued","2008"],["dc.description.abstract","The aim of the study was to evaluate the time zero mechanical properties of single- versus double-row configuration for rotator cuff repair in an animal model with consideration of the stitch technique and suture material. Thirty-two fresh-frozen sheep shoulders were randomly assigned to four repair groups: suture anchor single-row repair coupled with (1) braided, nonabsorbable polyester suture sized USP No. 2 (SRAE) or (2) braided polyblend polyethylene suture sized No. 2 (SRAH). The double-row repair was coupled with (3) USP No. 2 (DRAE) or (4) braided polyblend polyethylene suture No. 2 (DRAH). Arthroscopic Mason-Allen stitches were used (single-row) and combined with medial horizontal mattress stitches (double-row). Shoulders were cyclically loaded from 10 to 180 N. Displacement to gap formation of 5- and 10-mm at the repair site, cycles to failure, and the mode of failure were determined. The ultimate tensile strength was verified in specimens that resisted to 3,000 cycles. DRAE and DRAH had a lower frequency of 5- (P = 0.135) and 10-mm gap formation (P = 0.135). All DRAE and DRAH resisted 3,000 cycles while only three SRAE and one SRAH resisted 3,000 cycles (P < 0.001). The ultimate tensile strength in double-row specimens was significantly higher than in others (P < 0.001). There was no significant variation in using different suture material (P > 0.05). Double-row suture anchor repair with arthroscopic Mason-Allen/medial mattress stitches provides initial strength superior to single-row repair with arthroscopic Mason-Allen stitches under isometric cyclic loading as well as under ultimate loading conditions. Our results support the concept of double-row fixation with arthroscopic Mason-Allen/medial mattress stitches in rotator cuff tears with improvement of initial fixation strength and ultimate tensile load. Use of new polyblend polyethylene suture material seems not to increase the initial biomechanical aspects of the repair construct."],["dc.identifier.doi","10.1007/s00167-008-0590-2"],["dc.identifier.isi","000260526100014"],["dc.identifier.pmid","18758750"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6696"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53044"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0942-2056"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Biomechanical characteristics of single-row repair in comparison to double-row repair with consideration of the suture configuration and suture material"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","769"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Arthroscopy The Journal of Arthroscopic and Related Surgery"],["dc.bibliographiccitation.lastpage","777"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Baums, Mike Herbert"],["dc.contributor.author","Spahn, Gunter"],["dc.contributor.author","Buchhorn, Gottfried Hans"],["dc.contributor.author","Schultz, Wolfgang"],["dc.contributor.author","Hofmann, Lars"],["dc.contributor.author","Klinger, Hans-Michael"],["dc.date.accessioned","2018-11-07T09:09:51Z"],["dc.date.available","2018-11-07T09:09:51Z"],["dc.date.issued","2012"],["dc.description.abstract","Purpose: To investigate the biomechanical and magnetic resonance imaging (MRI)-derived morphologic changes between single- and double-row rotator cuff repair at different time points after fixation. Methods: Eighteen mature female sheep were randomly assigned to either a single-row treatment group using arthroscopic Mason-Allen stitches or a double-row treatment group using a combination of arthroscopic Mason-Allen and mattress stitches. Each group was analyzed at 1 of 3 survival points (6 weeks, 12 weeks, and 26 weeks). We evaluated the integrity of the cuff repair using MRI and biomechanical properties using a mechanical testing machine. Results: The mean load to failure was significantly higher in the double-row group compared with the single-row group at 6 and 12 weeks (P = .018 and P = .002, respectively). At 26 weeks, the differences were not statistically significant (P = .080). However, the double-row group achieved a mean load to failure similar to that of a healthy infraspinatus tendon, whereas the single-row group reached only 70% of the load of a healthy infraspinatus tendon. No significant morphologic differences were observed based on the MRI results. Conclusions: This study confirms that in an acute repair model, double-row repair may enhance the speed of mechanical recovery of the tendon-bone complex when compared with single-row repair in the early postoperative period. Clinical Relevance: Double-row rotator cuff repair enables higher mechanical strength that is especially sustained during the early recovery period and may therefore improve clinical outcome."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [BA 3833/1-1]"],["dc.identifier.doi","10.1016/j.arthro.2011.11.019"],["dc.identifier.isi","000304444200007"],["dc.identifier.pmid","22321200"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26360"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","W B Saunders Co-elsevier Inc"],["dc.relation.issn","0749-8063"],["dc.title","Biomechanical and Magnetic Resonance Imaging Evaluation of a Single- and Double-Row Rotator Cuff Repair in an In Vivo Sheep Model"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","231"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Current Medical Imaging Reviews"],["dc.bibliographiccitation.lastpage","235"],["dc.bibliographiccitation.volume","4"],["dc.contributor.author","Ernstberger, Thorsten"],["dc.contributor.author","Heidrich, Gabert"],["dc.contributor.author","Klinger, Hans Michael"],["dc.contributor.author","Baums, Mike Herbert"],["dc.contributor.author","Buchhorn, Gottfried"],["dc.date.accessioned","2018-11-07T11:09:23Z"],["dc.date.available","2018-11-07T11:09:23Z"],["dc.date.issued","2008"],["dc.description.abstract","Objectives: Interbody spacers for anterior spine fusion are made of different materials, which can affect the post-fusion MRI scans. Susceptibility artifacts specially for metallic implants can decrease the image quality. This study focused on the influence of determined implant parameters like shape and implant volume in MRI artifacting independent from selected MRI-sequences and implant materials. Material and methods: In this study we evaluated the post-implantation MRI scans of 3 determined titanium cuboids and 6 cylinders. MRI scans were carried out by using T1 TSE sequences. The total artifact volume (TAV) of all examined implants was calculated for statistical t-test correlation and implant volume (IV)/TAV-relation. Results: Considering all examined test implants with an increasing implant size the TAV became significantly larger (p<0,001) with simultaneous reduction of the implant artifact relation. Regarding a TAV-correlation for cylinders with an implant volume equivalent to the cuboids significantly differences in MRI artifacting could be demonstrated (p<0,05). Conclusion: Susceptibility artifacts are directly influenced by parameters which determine the implant size and volume. With regard to a more advantageous IV / TAV-relation for larger titanium implants the artifact rate was more limited to the implant's direct surroundings. Significant differences with regard to the TAV could be determined in favor of a cylindric implant shape. The results demonstrated that the artifact rate of our used test implants is influenced by the material volume as well as implant shape."],["dc.identifier.doi","10.2174/157340508786404053"],["dc.identifier.isi","000261892400005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/52995"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Bentham Science Publ Ltd"],["dc.relation.issn","1573-4056"],["dc.title","Post Fusion MRI Artifacting - An In Vitro Study of Defined Intervertebral Test Spacers"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]