Balcarek, Peter

[["dc.bibliographiccitation.firstpage","2308"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","Knee Surgery Sports Traumatology Arthroscopy"],["dc.bibliographiccitation.lastpage","2314"],["dc.bibliographiccitation.volume","22"],["dc.contributor.author","Balcarek, Peter"],["dc.contributor.author","Oberthuer, Swantje"],["dc.contributor.author","Hopfensitz, Stephanie"],["dc.contributor.author","Frosch, Stephan"],["dc.contributor.author","Walde, Tim Alexander"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Schuettrumpf, Jan Philipp"],["dc.contributor.author","Stuermer, Klaus Michael"],["dc.date.accessioned","2018-11-07T09:34:48Z"],["dc.date.available","2018-11-07T09:34:48Z"],["dc.date.issued","2014"],["dc.description.abstract","The purpose of this study was to identify the risk factors for recurrent lateral patellar dislocations and to incorporate those factors into a patellar instability severity score. Sixty-one patients [male/female 35/26; median age 19 years (range 9-51 years)] formed the study group for this investigation. Within the study group, 40 patients experienced a patellar redislocation within 24 months after the primary dislocation, whereas 21 patients, who were assessed after a median follow-up of 37 months (range 24-60 months), had not experienced a subsequent episode of lateral patellar instability. In all patients, age at the time of the primary dislocation, gender, the affected body side, body mass index, bilateral instability, physical activity according to Baecke's questionnaire, the grade of trochlear dysplasia, patellar height, tibial tuberosity-trochlear groove (TT-TG) distance, and patellar tilt were assessed. The odds ratio (OR) of each factor with regard to the patellar redislocation was calculated using contingency tables. Based on these data, a \"patellar instability severity score\" was calculated. The patellar instability severity score has six factors: age, bilateral instability, the severity of trochlear dysplasia, patella alta, TT-TG distance, and patellar tilt; the total possible score is seven. Reapplying this score to the study population revealed a median score of 4 points (range 2-7) for those patients with an early episode of patellar redislocation and a median score of 3 points (range 1-6) for those without a redislocation (p = 0.0004). The OR for recurrent dislocations was 4.88 (95 % CI 1.57-15.17) for the patients who scored 4 or more points when compared with the patients who scored 3 or fewer points (p = 0.0064). Based on the individual patient data, the patellar instability severity score allows an initial risk assessment for experiencing a recurrent patellar dislocation and might help differentiate between responders and non-responders to conservative treatment after primary lateral patellar instability."],["dc.identifier.doi","10.1007/s00167-013-2650-5"],["dc.identifier.isi","000342468800007"],["dc.identifier.pmid","24005331"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32253"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1433-7347"],["dc.relation.issn","0942-2056"],["dc.title","Which patellae are likely to redislocate?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","195"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Annals of Anatomy - Anatomischer Anzeiger"],["dc.bibliographiccitation.lastpage","199"],["dc.bibliographiccitation.volume","194"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Walde, Tim Alexander"],["dc.contributor.author","Balcarek, Peter"],["dc.contributor.author","Schuettrumpf, Jan Philipp"],["dc.contributor.author","Frosch, Stephan"],["dc.contributor.author","Stauffenberg, Caspar"],["dc.contributor.author","Frosch, Karl-Heinz"],["dc.contributor.author","Fiedler, Christoph"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Naegerl, Hans"],["dc.date.accessioned","2018-11-07T09:15:19Z"],["dc.date.available","2018-11-07T09:15:19Z"],["dc.date.issued","2012"],["dc.description.abstract","A novel class of total knee replacement (AEQUOS G1) is introduced which features a unique design of the articular surfaces. Based on the anatomy of the human knee and differing from all other prostheses, the lateral tibial \"plateau\" is convexly curved and the lateral femoral condyle is posteriorly shifted in relation to the medial femoral condyle. Under compressive forces the configuration of the articular surfaces of human knees constrains the relative motion of femur and tibia in flexion/extension. This constrained motion is equivalent to that of a four-bar linkage, the virtual 4 pivots of which are given by the centres of curvature of the articulating surfaces. The dimensions of the four-bar linkage were optimized to the effect that constrained motion of the total knee replacement (TKR) follows the flexional motion of the human knee in close approximation, particularly during gait. In pilot studies lateral X-ray pictures have demonstrated that AEQUOS G1 can feature the natural rollback in vivo. Rollback relieves the load of the patello-femoral joint and minimizes retropatellar pressure. This mechanism should reduce the prevalence of anterior knee pain. The articulating surfaces roll predominantly in the stance phase. Consequently sliding friction is replaced by the lesser rolling friction under load. Producing rollback should minimize material wear due to friction and maximize the lifetime of the prosthesis. To definitely confirm these theses one has to wait for the long term results. (C) 2011 Elsevier GmbH. All rights reserved."],["dc.identifier.doi","10.1016/j.aanat.2011.01.013"],["dc.identifier.isi","000304339900008"],["dc.identifier.pmid","21493053"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27655"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Gmbh, Urban & Fischer Verlag"],["dc.relation.issn","0940-9602"],["dc.title","Total knee replacement with natural rollback"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1552"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Knee Surgery Sports Traumatology Arthroscopy"],["dc.bibliographiccitation.lastpage","1558"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Frosch, Stephan"],["dc.contributor.author","Buchhorn, Gottfried"],["dc.contributor.author","Hoffmann, Anja"],["dc.contributor.author","Balcarek, Peter"],["dc.contributor.author","Schuettrumpf, Jan Philipp"],["dc.contributor.author","August, Florian"],["dc.contributor.author","Stuermer, Klaus Michael"],["dc.contributor.author","Walde, Hans Joachim"],["dc.contributor.author","Walde, Tim Alexander"],["dc.date.accessioned","2018-11-07T09:57:55Z"],["dc.date.available","2018-11-07T09:57:55Z"],["dc.date.issued","2015"],["dc.description.abstract","In rotator cuff repair, strong and long-lasting suturing techniques that do not require additional implants are needed. This study examines the ultimate load to failure and the Young's modulus at the suture-tendon interface for a novel single-loop knot stitch and double-loop knot stitch. These values are compared to those of the modified Mason-Allen stitch. Twenty-four infraspinatus muscles with tendons were dissected from porcine shoulders (twelve Goettingen minipigs). The preparations were randomly allocated to three groups of eight samples. Load-to-failure testing of the single-loop knot stitch, the double-loop knot stitch and the mMAS were performed using a Zwick 1446 universal testing machine (Zwick-Roell AG, Ulm, Germany). The highest ultimate load to failure for the three techniques occurred with the double-loop knot stitch with a median value of 382.2 N (range 291.8-454.2 N). These values were significantly higher than those of the single-loop knot stitch, which had a median value of 259.5 N (range 139.6-366.3 N) and the modified Mason-Allen stitch, which had a median value of 309.3 N (range 84.55-382.9 N). The values of the single-loop knot stitch and the modified Mason-Allen stitch did not differ significantly. Regarding the Young's modulus, no significant differences were found between the double-loop knot stitch with a median value of 496.02 N/mmA(2) (range 400.4-572.6 N/mmA(2)) and the modified Mason-Allen stitch with 498.5 N/mmA(2) (range 375.5-749.2 N/mmA(2)) with respect to the stiffness of the suture-tendon complex. The median value for the Young's modulus of the single-loop knot stitch of 392.1 N/mmA(2) (range 285.7-510.6 N/mmA(2)) was significantly lower than those of the double-loop knot stitch and modified Mason-Allen stitch. This in vitro animal study demonstrated that both the single-loop knot stitch and the double-loop knot stitch have excellent ultimate load-to-failure properties when used for rotator cuff repair. The introduced single-loop knot stitch and double-loop knot stitch offer an alternative to other common used stitch techniques in rotator cuff repair."],["dc.identifier.doi","10.1007/s00167-014-2976-7"],["dc.identifier.isi","000353829500041"],["dc.identifier.pmid","24756537"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37262"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","1433-7347"],["dc.relation.issn","0942-2056"],["dc.title","Novel single-loop and double-loop knot stitch in comparison with the modified Mason-Allen stitch 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","367"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Journal of Anatomy"],["dc.bibliographiccitation.lastpage","373"],["dc.bibliographiccitation.volume","225"],["dc.contributor.author","Frosch, Stephan"],["dc.contributor.author","Brodkorb, Tobias"],["dc.contributor.author","Schuettrumpf, Jan Philipp"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Walde, Tim Alexander"],["dc.contributor.author","Stuermer, Klaus Michael"],["dc.contributor.author","Balcarek, Peter"],["dc.date.accessioned","2018-11-07T09:36:17Z"],["dc.date.available","2018-11-07T09:36:17Z"],["dc.date.issued","2014"],["dc.description.abstract","The medial and lateral tibia plateau geometry has been linked with the severity of trochlear dysplasia. The aim of the present study was to evaluate the tibial slope and the femoral posterior condylar offset in a cohort of consecutive subjects with a trochlear dysplastic femur to investigate whether the condylar offset correlates with, and thus potentially compensates for, tibial slope asymmetry. Magnetic resonance imaging was used to assess the severity of trochlear dysplasia as well as the tibial slope and posterior offset of the femoral condyles separately for the medial and lateral compartment of the knee joint in 98 subjects with a trochlear dysplastic femur and 88 control subjects. A significant positive correlation was found for the medial tibial slope and the medial posterior condylar offset in the study group (r(2) = 0.1566; P < 0.001). This relationship was significant for all subtypes of trochlear dysplasia and was most pronounced in the severe trochlear dysplastic femur (Dejour type D) (r(2) = 0.3734; P = 0.04). No correlation was found for the lateral condylar offset and the lateral tibial slope in the study group or for the condylar offset and the tibial slope on both sides in the control group. The positive correlation between the medial femoral condylar offset and the medial tibial slope, that is, a greater degree of the medial tibial slope indicated a larger offset of the medial femoral condyle, appears to represent a general anthropomorphic characteristic of distal femur geometry in patients with a trochlear dysplastic femur."],["dc.identifier.doi","10.1111/joa.12214"],["dc.identifier.isi","000340538800009"],["dc.identifier.pmid","25040233"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/32580"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1469-7580"],["dc.relation.issn","0021-8782"],["dc.title","Characteristics of femorotibial joint geometry in the trochlear dysplastic femur"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","319"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","The Journal of Knee Surgery"],["dc.bibliographiccitation.lastpage","326"],["dc.bibliographiccitation.volume","26"],["dc.contributor.author","Schuettrumpf, Jan Philipp"],["dc.contributor.author","Behzadi, Cyrus"],["dc.contributor.author","Balcarek, Peter"],["dc.contributor.author","Walde, Tim Alexander"],["dc.contributor.author","Frosch, Stephan"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Stuermer, Klaus Michael"],["dc.contributor.author","Frosch, Karl-Heinz"],["dc.date.accessioned","2018-11-07T09:19:39Z"],["dc.date.available","2018-11-07T09:19:39Z"],["dc.date.issued","2013"],["dc.description.abstract","The blood supply to the proximal patella is provided primarily via intraosseous vessels from the inferior patella. Two vascular systems within the patella are distinguished: Tiny arteries penetrate the middle third of the anterior patellar surface via vascular foramina and continue in a proximal direction. Additional vessels enter the patella at its distal pole, between the patellar ligament and the articular surface, and also run proximally. As a result of the double vascular supply to the distal portion and the vulnerable blood supply to the proximal part, localized osteonecroses subsequent to fracture may occur within the patella and nearly exclusively affect the upper portion of the patella. Such focal regions of osteonecrosis may appear radiographically as localized regions of hyperdensity within the patella. The aim of this study was to investigate the extent to which radiologically hyperdense areas, possibly representing localized osteonecrosis, may occur subsequent to surgical treatment of a patella fracture and the influence that they have on the outcome of the fracture. Retrospective analysis of 100 patients who had been treated operatively for a patella fracture from January 1998 to December 2008 was conducted. The subjective pain rating, clinical scores, and patient satisfaction scores were recorded. Existing X-rays were assessed with regard to possible increased radiological dense areas. After an average of 60.61 (+/- 33.88) months, it was possible to perform a clinical follow-up on 60 patients aged 45.48 (+/- 18.51) years. Radiographic follow-up of all patients revealed that nine patients (9%) exhibited a hyperdense area in the proximal patella portion. X-rays showed radiopaque areas between 1 and 2 months after surgery. In seven cases, the radiological finding disappeared after six months. In two patients with persisting radiologically dense areas, bone necrosis was verified by means of magnetic resonance imaging (MRI) examination and a histological assessment, respectively. The clinical outcome of these patients with a hyperdense area on the patella, in this small series, was not shown to be worse than those who demonstrated normal healing. Radiologically hyperdense areas subsequent to patella fracture may represent partial osteonecrosis caused by localized vascular compromise. This was confirmed by MRI and histological examinations in two patients with persistent hyperdense lesions. The clinical outcome of patients with hyperdense zones seems to be poorer than that of patients without such findings, but no statistical difference was shown in this small series. It is possible that earlier surgical treatment and thus a shorter ischemic period as well as tissue-conserving operative techniques could prevent the occurrence of partial necroses. This hypothesis would require further study."],["dc.identifier.doi","10.1055/s-0032-1332805"],["dc.identifier.isi","000346585200006"],["dc.identifier.pmid","23288779"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28690"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Georg Thieme Verlag Kg"],["dc.relation.issn","1938-2480"],["dc.relation.issn","1538-8506"],["dc.title","Radiologically Hyperdense Zones of the Patella Seem to Be Partial Osteonecroses Subsequent to Fracture Treatment"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","35"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","ACTA OF BIOENGINEERING AND BIOMECHANICS"],["dc.bibliographiccitation.lastpage","42"],["dc.bibliographiccitation.volume","13"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Fiedler, Christoph"],["dc.contributor.author","Walde, Tim Alexander"],["dc.contributor.author","Balcarek, Peter"],["dc.contributor.author","Schuettrumpf, Jan Philipp"],["dc.contributor.author","Frosch, Stephan"],["dc.contributor.author","Frosch, Karl-Heinz"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Gezzi, Riccardo"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Naegerl, Hans"],["dc.date.accessioned","2018-11-07T09:00:34Z"],["dc.date.available","2018-11-07T09:00:34Z"],["dc.date.issued","2011"],["dc.description.abstract","Firstly, the way of implementing approximatively the initial rollback of the natural tibiofemoral joint (TFJ) in a total knee replacement (AEQUOS G1 TKR) is discussed. By configuration of the curvatures of the medial and lateral articulating surfaces a cam gear mechanism with positive drive can be installed, which works under force closure of the femoral and tibial surfaces. Briefly the geometric design features in flexion/extension are described and construction-conditioned kinematical and functional properties that arise are discussed. Due to a positive drive of the cam gear under the force closure during the stance phase of gait the articulating surfaces predominantly roll. As a result of rolling, a sliding friction is avoided, thus the resistance to motion is reduced during the stance phase. Secondly, in vivo fluoroscopic measurements of the patella tendon angle during flexion/extension are presented. The patella tendon angle/knee flexion angle characteristic and the kinematic profile in trend were similar to those observed in the native knee during gait (0 degrees-60 degrees)."],["dc.identifier.isi","000297737600004"],["dc.identifier.pmid","22098089"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24198"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wroclaw Univ Technology"],["dc.relation.issn","1509-409X"],["dc.title","Construction-conditioned rollback in total knee replacement: fluoroscopic results"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]