Ammon, Jan

[["dc.bibliographiccitation.firstpage","994"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Orthopaedic Surgery"],["dc.bibliographiccitation.lastpage","1002"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Saul, Dominik"],["dc.contributor.author","Riekenberg, Juliane"],["dc.contributor.author","Ammon, Jan C."],["dc.contributor.author","Hoffmann, Daniel B."],["dc.contributor.author","Sehmisch, Stephan"],["dc.date.accessioned","2020-06-08T13:10:10Z"],["dc.date.available","2020-06-08T13:10:10Z"],["dc.date.issued","2019"],["dc.description.abstract","Objective Investigation of the treatment of femur fractures and the type of femur fracture‐associated complications regarding timing of surgery and length of hospital stay. Methods In this retrospective cohort study, a total of 358 hip fractures were evaluated retrospectively from 1 January 2008 until 31 December 2010 at a level I trauma center in Germany. Inclusion criteria was age >18 years and a proximal femur fracture. Both sexes were evaluated. Mean age was 75.5 years, most patients were female (63.7%). Intervention was the operative treatment of proximal femur fracture. Outcome parameters were time until surgery, complications, reoperations, mortality, and length of hospital stay. Results Among the proximal femur fractures (n = 358), 46.6% were pertrochanteric, 11.2% subtrochanteric, and 42.2% femoral neck fractures. Operation upon hip fractures was managed regularly within 24 hours of injury (73%; mean for femoral neck: 28.3 hrs.; mean for pertrochanteric fractures: 21.4 hrs.; mean for subtrochanteric fractures: 19.5 hrs.). Delayed treatment, as well as implantation of hip total endoprosthesis (TEP), increased the overall length of hospital stay (15.4 vs 17.6 days; 18.1 vs 15.8 days). Accordingly, surgical procedures performed within 24 hours of injury resulted in a shorter hospital residence. Longest delay of operation was measured for hip fractures (28.3 hrs.). In 351 patients, secondary injuries were detected in 94 individuals (26%), with fractures being the most common secondary injury (n = 40). We recorded postoperative complications of nonsurgical and surgical origin, and 33.6% of our patient cohort displayed complications. Complications were distributed among 118 patients. There was no significant difference in complications regarding the time of operation, with most nonsurgical and surgical complications appearing within 24 hours after operation (n = 110 vs n = 31). Nonsurgical complications, such as anemia (n = 49) and electrolyte imbalances (n = 30), were observed more frequently than surgical complications (n = 107 vs n = 34); however, these complications were reduced by delay in surgery (82.0% in 6–24 hrs. vs 74.2% in ≥24 hrs.). Anticoagulant therapy and age did not affect postoperative complications. The hospital mortality of patients was 6.2%. Follow‐up was restrained to ambulatory visits in the clinic. Conclusions Surgical management of hip fractures performed within 24 hours of injury minimizes hospital stay. We did not detect significant differences in the spectrum or number of complications regarding delay of surgery. Surgical complications mainly occur with rapid primary care, and medical complications can be reduced by more intensive preparation of patient and operation procedures."],["dc.identifier.doi","10.1111/os.12524"],["dc.identifier.isi","WOS:000488199600001"],["dc.identifier.pmid","31568676"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/16519"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/66198"],["dc.identifier.url","https://publons.com/publon/28102254/"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.publisher","John Wiley \\u0026 Sons Australia, Ltd"],["dc.relation.eissn","1757-7861"],["dc.relation.issn","1757-7853"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Hip Fractures: Therapy, Timing, and Complication Spectrum"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","252"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Der Unfallchirurg"],["dc.bibliographiccitation.lastpage","256"],["dc.bibliographiccitation.volume","120"],["dc.contributor.author","Saul, D."],["dc.contributor.author","Ammon, J. C."],["dc.contributor.author","August, F."],["dc.date.accessioned","2018-11-07T10:26:50Z"],["dc.date.accessioned","2020-06-15T06:47:12Z"],["dc.date.available","2018-11-07T10:26:50Z"],["dc.date.available","2020-06-15T06:47:12Z"],["dc.date.issued","2016"],["dc.description.abstract","We report the case of a 15-year-old boy with combined fractures of the scaphoid, capitate, and hamate that represents a rare variation of the well-known Fenton's syndrome. Fixation was performed for the unstable fractures of the scaphoid and capitate with the use of cannulated Herbert screws and KaEurowires respectively. KaEurowires were removed after 6 months, with subsequent physiotherapy. After 6 months, CT confirmed complete consolidation of the two surgically treated carpal fractures and the conservatively treated fracture of the hamate. Regarding function, the patient is able to incorporate the hand into his school-related activities and has a good range of motion, with strong closure of the fist."],["dc.description.abstract","Wir berichten über einen 15-jährigen Jungen mit Skaphoidfraktur, Kapitatumfraktur und Hamatumfraktur als seltene Variation des bekannten Fenton-Syndroms. Die operative Versorgung der instabilen Frakturen von Skaphoid und Kapitatum erfolgte jeweils mit einer Herbertschraube und einem K‑Draht, Letztere wurden nach sechs Monaten entfernt, gefolgt von physiotherapeutischer Beübung. Nach sechs Monaten zeigte sich im CT eine vollständige Verheilung der beiden operativ versorgten Handwurzelfrakturen und der konservativ therapierten Hamatumfraktur. Funktionell kann der Patient seine Hand in den schulischen Alltag integrieren und zeigt ein gutes Bewegungsausmaß mit kräftigem Faustschluss."],["dc.identifier.doi","10.1007/s00113-016-0259-0"],["dc.identifier.isi","000396116700014"],["dc.identifier.pmid","27770167"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/66240"],["dc.language.iso","de"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.eissn","0177-5537"],["dc.relation.issn","1433-044X"],["dc.title","Versorgung einer komplexen jugendlichen Handwurzelfraktur. Eine seltene Verletzung am wachsenden Skelett"],["dc.title.alternative","Surgical treatment of a complex adolescent carpal fracture. A rare injury to the growing skeleton"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","926"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Arthroscopy"],["dc.bibliographiccitation.lastpage","935"],["dc.bibliographiccitation.volume","26"],["dc.contributor.author","Balcarek, Peter"],["dc.contributor.author","Ammon, Jan"],["dc.contributor.author","Frosch, Stephan"],["dc.contributor.author","Walde, Tim A."],["dc.contributor.author","Schüttrumpf, Jan P."],["dc.contributor.author","Ferlemann, Keno G."],["dc.contributor.author","Lill, Helmut"],["dc.contributor.author","Stürmer, Klaus M."],["dc.contributor.author","Frosch, Karl-Heinz"],["dc.date.accessioned","2021-06-01T10:49:25Z"],["dc.date.available","2021-06-01T10:49:25Z"],["dc.date.issued","2010"],["dc.identifier.doi","10.1016/j.arthro.2009.11.004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/86284"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-425"],["dc.relation.issn","0749-8063"],["dc.title","Magnetic Resonance Imaging Characteristics of the Medial Patellofemoral Ligament Lesion in Acute Lateral Patellar Dislocations Considering Trochlear Dysplasia, Patella Alta, and Tibial Tuberosity–Trochlear Groove Distance"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","509"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Calcified Tissue International"],["dc.bibliographiccitation.lastpage","520"],["dc.bibliographiccitation.volume","92"],["dc.contributor.author","Komrakova, Marina"],["dc.contributor.author","Sehmisch, Stephan"],["dc.contributor.author","Tezval, Mohammad"],["dc.contributor.author","Ammon, Jan"],["dc.contributor.author","Lieberwirth, Peggy"],["dc.contributor.author","Sauerhoff, Cordula"],["dc.contributor.author","Trautmann, Lukas"],["dc.contributor.author","Wicke, Michael"],["dc.contributor.author","Dullin, Christian"],["dc.contributor.author","Stuermer, Klaus-Michael"],["dc.contributor.author","Stuermer, Ewa Klara"],["dc.date.accessioned","2018-11-07T09:24:23Z"],["dc.date.available","2018-11-07T09:24:23Z"],["dc.date.issued","2013"],["dc.description.abstract","Numerous whole-body vibration (WBV) devices of various forces are available on the market, although their influence on the musculoskeletal system is not yet understood. The effect of different WBVs on bone healing and muscle function was evaluated in rats ovariectomized at 3 months of age. 2 months after ovariectomy, bilateral metaphyseal tibia osteotomy and T-plate osteosynthesis were performed. Rats were divided into groups: intact, OVX, and OVX exposed to vertical WBVs of 35, 50, 70, or 90 Hz (experiment 1) or horizontal WBVs of 30, 50, 70, or 90 Hz (experiment 2) 5 days after osteotomy (0.5 mm, 15 min/day for 30 days). The tibia and gastrocnemius and soleus muscles were collected. Vertical vibrations (> 35 Hz) improved cortical and callus densities, enlarged callus area and width, suppressed the tartrate-resistant acid phosphatase gene, enhanced citrate synthase activity, accelerated osteotomy bridging (35 and 50 Hz), upregulated the osteocalcin (Oc) gene (70 Hz), and increased relative muscle weight (50 Hz). Horizontal vibrations reduced cortical width (< 90 Hz) and callus density (30 Hz), enhanced alkaline phosphatase (Alp) gene expression (50 Hz), decreased the size of oxidative fibers (35 and 70 Hz), and increased capillary density (70, 90 Hz). Biomechanical data; serum Oc, Alp, and creatine kinase activities; body weight; and food intake did not change after WBVs. Vertical WBVs of 35 and 50 Hz produced more favorable results than the higher frequencies. Horizontal WBV showed no positive or negative effects. Further studies are needed to elucidate the effects of WBV on different physiological systems, and precautions must be taken when implementing WBV in the treatment of patients."],["dc.description.sponsorship","German Research Foundation (DFG) [STU 478/3-2]"],["dc.identifier.doi","10.1007/s00223-013-9706-x"],["dc.identifier.isi","000319021400003"],["dc.identifier.pmid","23416966"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10285"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/29810"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Springer"],["dc.relation.issn","0171-967X"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.title","Identification of a Vibration Regime Favorable for Bone Healing and Muscle in Estrogen-Deficient Rats"],["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","2320"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","The American Journal of Sports Medicine"],["dc.bibliographiccitation.lastpage","2327"],["dc.bibliographiccitation.volume","38"],["dc.contributor.author","Balcarek, P."],["dc.contributor.author","Jung, K."],["dc.contributor.author","Ammon, J."],["dc.contributor.author","Walde, T. A."],["dc.contributor.author","Frosch, S."],["dc.contributor.author","Schuttrumpf, J. P."],["dc.contributor.author","Stürmer, K. M."],["dc.contributor.author","Frosch, K.-H."],["dc.date.accessioned","2019-07-09T11:52:57Z"],["dc.date.available","2019-07-09T11:52:57Z"],["dc.date.issued","2010"],["dc.description.abstract","Background: A trend toward young women being at greatest risk for primary and recurrent dislocation of the patella is evident in the current literature. However, a causative factor is missing, and differences in the anatomical risk factors between men and women are less defined. Purpose: To identify differences between the sexes in the anatomy of lateral patellar instability. Study Design: Case control study; Level of evidence, 3. Methods: Knee magnetic resonance images were collected from 100 patients treated for lateral patellar instability. Images were obtained from 157 patients without patellar instability who served as controls. Using 2-way analyses of variance, the influence of patellar dislocation, gender, and their interaction were analyzed with regard to sulcus angle, trochlear depth, trochlear asymmetry, patellar height, and the tibial tubercle–trochlear groove (TT-TG) distance. Mechanisms of injury of first-time dislocations were divided into high-risk, low-risk, and no-risk pivoting activities and direct hits. Results: For all response variables, a significant effect was observed for the incidence of patellar dislocation (all P\\.01). In addition, sulcus angle, trochlear asymmetry, and trochlear depth depended significantly on gender (all P\\.01) but patellar height did not (P 5 .13). A significant interaction between patellar dislocation and gender was observed for the TT-TG distance (P 5 .02). The mean difference in TT-TG distance between study and control groups was 4.1 mm for women (P\\.01) and 1.6 mm for men (P 5 .05). Low-risk and no-risk pivoting injuries were most common in women, whereas first-time dislocations in men occurred mostly during high-risk pivoting activities (P\\.01). Conclusion: The data from this study indicate that trochlear dysplasia and the TT-TG distance is more prominent in women who dislocate the patella. Both factors might contribute to an increased risk of lateral patellar instability in the female patient as illustrated by the fact that dislocations occurred most often during low-risk or no-risk pivoting activities in women."],["dc.identifier.doi","10.1177/0363546510373887"],["dc.identifier.fs","572930"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/6247"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/60309"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.rights","Goescholar"],["dc.rights.uri","https://goescholar.uni-goettingen.de/licenses"],["dc.subject.ddc","610"],["dc.title","Anatomy of Lateral Patellar Instability: Trochlear Dysplasia and Tibial Tubercle-Trochlear Groove Distance Is More Pronounced in Women Who Dislocate the Patella"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]