Wachowski, Martin Michael

[["dc.bibliographiccitation.firstpage","45"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","ACTA OF BIOENGINEERING AND BIOMECHANICS"],["dc.bibliographiccitation.lastpage","53"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Naegerl, Hans"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Fiedler, Christoph"],["dc.contributor.author","Gowers, Luiko"],["dc.contributor.author","Kirsch, Stephanie"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Dumont, Clemens"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.date.accessioned","2018-11-07T10:03:03Z"],["dc.date.available","2018-11-07T10:03:03Z"],["dc.date.issued","2015"],["dc.description.abstract","Purpose: In comparative examinations of kinematics of the knees of humans and pigs in flexional/extensional motion under compressive loads, the significant differential geometric essentials of articular guidance are elaborated to criticise the shaping of the articular surfaces of conventional knee-endoprostheses and to suggest constructional outlines that allow the endoprosthesis to adopt natural knee kinematics. Implantation is discussed with regard to the remaining ligamentous apparatus. Methods: Twelve fresh pig knee joints and 19 preserved human knee joints were moved into several flexional/extensional positions. In each joint, the tibia and femur were repeatably caught by metal plates. After removing all ligaments, the tibia and femur were again caught in these positions, and their points of contact were marked on both articular surfaces. Along the marker points, a thin lead wire was glued onto each surface. The positions and shapes of the four contact lines were mapped by teleradiography. Results: All contact lines were found to be plane curves. The medial and lateral planes were parallel, thus defining the joint's sagittal plane. In the human knee, as compared to the lateral, the medial femoral contact line was always shifted anteriorly by several millimetres. The tibial contact curve was laterally convex and medially concave. In the pig knees, the lateral and medial contact lines were asymmetrically placed. Both tibial curves were convex. Conclusions: Both knees represent cam mechanisms (with one degree of freedom) that produce rolling of the articular surfaces during the stance phase. Implantation requires preservation of the anterior cruciate ligament, and ligamentous balancing is disadvantageous"],["dc.identifier.doi","10.5277/ABB-00119-2014-02"],["dc.identifier.isi","000359730600005"],["dc.identifier.pmid","26400423"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38364"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wroclaw Univ Technology"],["dc.relation.issn","1509-409X"],["dc.title","The morphology of the articular surfaces of biological knee joints provides essential guidance for the construction of functional knee endoprostheses"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","91"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Technology and Health Care"],["dc.bibliographiccitation.lastpage","102"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Floerkemeier, Thilo"],["dc.contributor.author","Frosch, Karl-Heinz"],["dc.contributor.author","Wachowski, Martin"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Gezzi, Riccardo"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Stuermer, Klaus Michael"],["dc.contributor.author","Naegerl, Hans"],["dc.date.accessioned","2018-11-07T09:02:04Z"],["dc.date.available","2018-11-07T09:02:04Z"],["dc.date.issued","2011"],["dc.description.abstract","After total knee replacement the persistence of pain represents a significant problem. In this study, a novel knee arthroplasty (Aequos G1 knee arthroplasty) is investigated that was designed to replicate main features of human knee morphology to reduce the periodically occurring pain after knee replacement. Previous work showed theoretically that this arthroplasty design may reconstruct the four-bar linkage mechanism as it occurs in human knee by contriving a convex lateral tibial compartment and a sagittal offset of the centre of the medial and lateral femur condyles - inducing a roll-back mechanism as it exists in human. The aim of this study was to determine whether this potential roll-back mechanism can be confirmed by in-vivo measurements. This retrospective study showed that the patellar tendon angle decreases during flexion of 0.21 degrees per degree of flexion on average in the 16 knees studied. This amount is similar to physiological knee kinematics and in contrast to existing results in the literature after implantation of conventional total knee replacements which lack physiological knee kinematics. The results suggest that physiological motion after implantation of the Aequos G1 knee arthroplasty occurs during loaded motion up to approximately 45 degrees knee flexion."],["dc.identifier.doi","10.3233/THC-2011-0616"],["dc.identifier.isi","000208598900003"],["dc.identifier.pmid","21422533"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/24586"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Ios Press"],["dc.relation.issn","0928-7329"],["dc.title","Physiologically shaped knee arthroplasty induces natural roll-back"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","212"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Zeitschrift für Orthopädie und Unfallchirurgie"],["dc.bibliographiccitation.lastpage","220"],["dc.bibliographiccitation.volume","145"],["dc.contributor.author","Dumont, C."],["dc.contributor.author","Fuchs, M."],["dc.contributor.author","Burchhardt, H."],["dc.contributor.author","Tezvall, M."],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Suermer, K. M."],["dc.date.accessioned","2018-11-07T11:04:51Z"],["dc.date.available","2018-11-07T11:04:51Z"],["dc.date.issued","2007"],["dc.description.abstract","Our study focuses to determine the medium-range results of function and radiological flndings of operatively treated fractures of the talus. Furthermore we had the intention to investigate risl-factors for posttraumatic arthrosis and necrosis of the talus. Material and Methods: We included all 41 patients (w/m: 13/28) operated between 19952000 with talus neck, corpus or dislocated fracture of the talus edge (open/closed: 11/30). Fractures were classified according to Hawkins: type 1: 6x, type II: 17x, type III: 7x, type IV: 3x, 8x dislocated peripheral fractures. 39x screw osteosynthesis, 2x K-wire fixation were done and 12 additive transfixation with fixateur externe. Score: AOFAS Ankle-Hindfoot-Scale, radiological assessment according to the Bargon score. 34 patients, mean age 35 years (12-60), were followed up clinically with an average of 4 years (24-72 months). Results: AOFAS Score: pain (40 points): circle divide 31 [10-40]; function (50 points): circle divide 39 [14-50]; alignement(10 points): circle divide 7 [0-10]; degree of arthritis due to the Bargon scale: 0 degrees: 5x, 1 degrees: 8x, 2 degrees: 7x, 3 degrees: 7x. Complications: 4x necrosis of margin of the wound, 1 deep infection, 5 necrosis of the talus bone. The severity of the fracture was I x type II according to Hawkins 3x type III and 1x type IV. 3 of the 5 patients who developed a talus necrosis had 2 degrees or 3 degrees soft tissue damage. One patient had an imminent compartment syndrome. One patient who suffered a polytrauma was operated six days post injury. Second operation: 1 Syme amputation due to necrosis of the talus subsequent to an infection. 4 x arthrodesis of the upper ankle joint and 5x arthrodesis of the subtalar joint due to posttraumatic arthritis. Conclusion: Primary screw osteosynthesis is the treatment of choice depending on the lesions of the soft-tissue and accompanied injuries in combination with a fixateur externe. Nevertheless the primary osteosynthesis is not able to prevent necrosis of the talus completely, that occurs in a frequency of 15%. Risk factors for a posttraumatic arthritis in addition to the type of fracture and the result of reconstruction are an accompanied soft tissue defect and local capsule-band complex with necessary temporary transfixation. Early plastic reconstruction of defects can reduce the time of immobilisation and allows motion therapy. The functional results are positive compared with the radiological results that showed arthritis in 70%."],["dc.identifier.doi","10.1055/s-2007-965202"],["dc.identifier.isi","000250147800019"],["dc.identifier.pmid","17492563"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/51939"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Thieme Medical Publ Inc"],["dc.relation.issn","1864-6743"],["dc.relation.issn","1864-6697"],["dc.title","What are the clinical results of operated fractures of the talus?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["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","415"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","European Journal of Radiology"],["dc.bibliographiccitation.lastpage","420"],["dc.bibliographiccitation.volume","79"],["dc.contributor.author","Balcarek, Peter"],["dc.contributor.author","Walde, Tim Alexander"],["dc.contributor.author","Frosch, Stephan"],["dc.contributor.author","Schüttrumpf, Jan P."],["dc.contributor.author","Wachowski, Martin M."],["dc.contributor.author","Stürmer, Klaus M."],["dc.contributor.author","Frosch, Karl-Heinz"],["dc.date.accessioned","2021-06-01T10:49:35Z"],["dc.date.available","2021-06-01T10:49:35Z"],["dc.date.issued","2011"],["dc.identifier.doi","10.1016/j.ejrad.2010.06.042"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/86346"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.relation.issn","0720-048X"],["dc.title","Patellar dislocations in children, adolescents and adults: A comparative MRI study of medial patellofemoral ligament injury patterns and trochlear groove anatomy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","103"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","ACTA OF BIOENGINEERING AND BIOMECHANICS"],["dc.bibliographiccitation.lastpage","110"],["dc.bibliographiccitation.volume","18"],["dc.contributor.author","Dathe, Henning"],["dc.contributor.author","Dumont, Clemens"],["dc.contributor.author","Perplies, Rainer"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Naegerl, Hans"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.date.accessioned","2018-11-07T10:20:13Z"],["dc.date.available","2018-11-07T10:20:13Z"],["dc.date.issued","2016"],["dc.description.abstract","Purpose: The purpose is to present a mathematical model of the function of the thumb carpometacarpal joint (TCMCJ) based on measurements of human joints. In the TCMCJ both articulating surfaces are saddle-shaped. The aim was to geometrically survey the shapes of the articulating surfaces using precise replicas of 28 TCMCJs. Methods: None of these 56 articulating surfaces did mathematically extend the differential geometrical neighbourhood around the main saddle point so that each surface could be characterised by three main parameters: the two extreme radii of curvature in the main saddle point and the angle between the saddles' asymptotics (straight lines). Results: The articulating surfaces, when contacting at the respective main saddle points, are incongruent. Hence, the TCMCJ has functionally five kinematical degrees of freedom (DOF); two DOF belong to flexion/extension, two to ab-/adduction. These four DOF are controlled by the muscular apparatus. The fifth DOF, axial rotation, cannot be adjusted but stabilized by the muscular apparatus so that physiologically under compressive load axial rotation does not exceed an angle of approximately +/- 3 degrees. Conclusions: The TCMCJ can be stimulated by the muscular apparatus to circumduct. The mechanisms are traced back to the curvature incongruity of the saddle surfaces. Hence we mathematically proved that none of the individual saddle surfaces can be described by a quadratic saddle surface as is often assumed in literature. We derived an algebraic formula with which the articulating surfaces in the TCMCJ can be quantitatively described. This formula can be used to shape the articulating surfaces in physiologically equivalent TCMCJ-prostheses."],["dc.identifier.doi","10.5277/ABB-00386-2015-02"],["dc.identifier.isi","000379915800011"],["dc.identifier.pmid","27405537"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41834"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wroclaw Univ Technology"],["dc.relation.issn","1509-409X"],["dc.title","The thumb carpometacarpal joint: curvature morphology of the articulating surfaces, mathematical description and mechanical functioning"],["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","3"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","ACTA OF BIOENGINEERING AND BIOMECHANICS"],["dc.bibliographiccitation.lastpage","8"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Naegerl, Hans"],["dc.contributor.author","Hawellek, Thelonius"],["dc.contributor.author","Lehmann, Andrea"],["dc.contributor.author","Hubert, Jan"],["dc.contributor.author","Saptschak, Julia"],["dc.contributor.author","Doerner, Jochen"],["dc.contributor.author","Raab, Bjoern Werner"],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.date.accessioned","2018-11-07T08:33:37Z"],["dc.date.available","2018-11-07T08:33:37Z"],["dc.date.issued","2009"],["dc.description.abstract","Spinal biomechanics is still known just fragmentary since the only description by angle-torque characteristics without simultaneous recording of migration of the instantaneous helical axis (IHA) is not sufficient. Time-dependent flexion/extension following a cyclic laterally directed torque was measured at all six degrees of freedom by a highly precise custom-made 6D apparatus. In order to enhance the localizing resolution of IHA migration as the function of the flexional/extensional angle, small ranges of motion (ROM) were used at several degrees of pre-extension. 4 L3/L4, 3 L4/L5 and 2 T2/T3 human segments were investigated. In extensional motion, wide dorsal IHA-migrations were measured in lumbar segments and correlated with the distinct asymmetric shapes of the characteristics in extensional motion. The respective increase of differential stiffness could mainly be traced back to the enlarging geometrical moment of inertia of the segments by the dorsally migrating IHA. Both thoracic segments showed a predominant IHA-migration in cranial/caudal direction. A simple model makes it evident that the opposite curvature morphology of lumbar and thoracic joint facets conditions the different directions of IHA migration."],["dc.identifier.isi","000278856100001"],["dc.identifier.pmid","20405809"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/17620"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wroclaw Univ Technology"],["dc.relation.issn","1509-409X"],["dc.title","Non-linearity of flexion-extension characteristics in spinal segments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","281"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Strain"],["dc.bibliographiccitation.lastpage","287"],["dc.bibliographiccitation.volume","47"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Mansour, Michael"],["dc.contributor.author","Hawallek, T."],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Hubert, Jan"],["dc.contributor.author","Naeger, H."],["dc.date.accessioned","2018-11-07T08:55:55Z"],["dc.date.available","2018-11-07T08:55:55Z"],["dc.date.issued","2011"],["dc.description.abstract","To clarify relations between kinematics and mechanics of lumbar spinal segments (L3/L4, L4/L5) versus thoracic T6/T7. Measurements of rotational angle-torque characteristics and migrations of the instantaneous helical axis (IHA) in cyclic segment motions; correlation of IHA-position and differential segment stiffness by applying theorem of Steiner. In neutral axial position of the thoracic segment (alpha = 0), IHA was found within central areas of the intervertebral disc. No change of axial IHA-positions by flexion/extension. In axial rotation IHA-migrations along wide arches from one joint to the other and S-shaped characteristics: strong dependence of IHA-migration and the differential stiffness on the degree of flexion/extension. In flexion/extension, J-shape of the characteristic and simultaneous anterior/posterior IHA-migration. Correlation of initial differential segment stiffness and IHA-position via theorem of Steiner. The following conclusions are obtained: 1. Non-linearity of the characteristics is hardly produced by the soft tissues but mainly by IHA-migration and IHA-tilting. 2. The segment stiffness in axial rotation is parametrically controlled via the degree of additional flexion/extension. 3. The autochthon muscles are able to control the segment stiffness in axial rotation via shifting the resulting force line in anterior/posterior direction without change of its amount about the factor 3-5."],["dc.identifier.doi","10.1111/j.1475-1305.2009.00686.x"],["dc.identifier.isi","000290267900009"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23022"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0039-2103"],["dc.title","Parametric Control of the Stiffness of Lumbar Segments"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2286"],["dc.bibliographiccitation.issue","14"],["dc.bibliographiccitation.journal","Journal of Biomechanics"],["dc.bibliographiccitation.lastpage","2293"],["dc.bibliographiccitation.volume","42"],["dc.contributor.author","Wachowski, Martin Michael"],["dc.contributor.author","Mansour, Michael"],["dc.contributor.author","Lee, C."],["dc.contributor.author","Ackenhausen, A."],["dc.contributor.author","Spiering, S."],["dc.contributor.author","Fanghaenel, Jochen"],["dc.contributor.author","Dumont, C."],["dc.contributor.author","Kubein-Meesenburg, Dietmar"],["dc.contributor.author","Naegerl, H."],["dc.date.accessioned","2018-11-07T11:23:11Z"],["dc.date.available","2018-11-07T11:23:11Z"],["dc.date.issued","2009"],["dc.description.abstract","Purpose: To study and clarify the kinematics of spinal segments following cyclic torques causing axial rotation (T(z) (t)), lateral-flexion (T(x) (t)). flexion/extension (T(y) (t)) Methods A 6D--Measurement of location, alignment, and migration of the instantaneous helical axis (IHA) as a function of rotational angle in cervical, thoracic, and lumbar segments subjected to axially directed preloads. Results: IHA retained an almost constant alignment, but migrated along distinct centrodes. Thoracic segments: IHA was almost parallel to T(z) (t), T(x) (t), or T(y) (t), stationary for T(x) (t) or T(y) (t), and migrating for T(z) (t) along dorsally opened bows. IHA locations hardly depended on the position or size of axial preload. Lumbar segments: IHA was also almost parallel to T(z) (t), T(x) (t), or T(y) (t) In axial rotation IHA-migration along wide, ventrally or dorsally bent bows depending on segmental flexional/extensional status. Distances covered: 20-60 mm In lateral-flexion: IHA-migration to the left/right joint and vice versa. In flexion/extension IHA-migration from the facets to the centre of the disc. Cervical segments: In flexion/flexion IHA was almost stationary for and parallel to T(y) (t). In axial rotation or lateral-flexion IHA intersected T(z) (t)/T(x) (t) under approximately -30'/+30. Conclusions: Generally joints alternate in guidance Lumbar segments. in axial rotation and lateral-flexion parametrical control of IHA-position and IHA-migration by axial preload position. Cervical segments: kinematical coupling between axial rotation and lateral-flexion. The IHA-migration guided by the joints should be taken into account in the design of non-fusion implants. FE-calculations of spinal mechanics and kinematics should be based on detailed data of curvature morphology of the articulating surfaces of the joint facets. (C) 2009 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.jbiomech.2009.06.055"],["dc.identifier.isi","000271115700012"],["dc.identifier.pmid","19682692"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56141"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Sci Ltd"],["dc.relation.issn","0021-9290"],["dc.title","How do spinal segments move?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]