20 research outputs found
Posterior vertebral column resection with 360-degree osteosynthesis in osteoporotic kyphotic deformity and spinal cord compression
No full textResolution of the lumbosacral fractional curve and evaluation of the risk for adding on in 101 patients with posterior correction of Lenke 3, 4, and 6 curves
No full textOBJECTIVE In double and triple major adolescent idiopathic scoliosis curves it is still controversial whether the lowest instrumented vertebra (LIV) should be L3 or L4. Too short a fusion can impede postoperative distal curve compensation and promote adding on (AON). Longer fusions lower the chance of compensation by alignment changes of the lumbosacral curve (LSC). This study sought to improve prediction accuracy for AON and surgical outcomes in Lenke type 3, 4, and 6 curves.METHODS This was a retrospective multicenter analysis of patients with adolescent idiopathic scoliosis who had Lenke 3, 4, and 6 curves and >= 1 year of follow-up after posterior correction. Resolution of the LSC was studied by changes of LIV tilt, L3 tilt, and L4 tilt, with the variables resembling surrogate measures for the LSC. AON was defined as a disc angle below LIV > 5 degrees at follow-up. A matched-pairs analysis was done of differences between LIV at L3 and at L4. A multivariate prediction analysis evaluated the AON risk in patients with LIV at L3. Clinical outcomes were assessed by the Scoliosis Research Society 22-item questionnaire (SRS-22).RESULTS The sample comprised 101 patients (average age 16 years). The LIV was L3 in 54%, and it was L4 in 39%. At follow-up, 87% of patients showed shoulder balance, 86% had trunk balance, and 64% had a lumbar curve (LC) 5 20 degrees. With an LC 5 20 degrees (p = 0.01), SRS-22 scores were better and AON was less common (26% vs 59%, p = 0.001). Distal extension of the fusion (e.g., LIV at L4) did not have a significant influence on achieving an LSC < 20 degrees; however, higher screw density allowed better LC correction and resulted in better spontaneous LSC correction. AON occurred in 34% of patients, or 40% if the LIV was L3. Patients with AON had a larger residual LSC, worse LC correction, and worse thoracic curve (TC) correction. A total of 44 patients could be included in the matched-pairs analysis. LC correction and TC correction were comparable, but AON was 50% for LIV at L3 and 18% for LIV at L4. Patients without AON had a significantly better LC correction and TC correction (p < 0.01). For patients with LIV at L3, a significant prediction model for AON was established including variables addressed by surgeons: postoperative LC and TC (negative predictive value 78%, positive predictive value 79%, sensitivity 79%, specificity 81%).CONCLUSIONS An analysis of 101 patients with Lenke 3, 4, and 6 curves showed that TC and LC correction had significant influence on LSC resolution and the risk for AON. Improving LC correction and achieving an LC < 20 degrees offers the potential to lower the risk for AON, particularly in patients with LIV at L3
Sensitivity of osteoblasts, fibroblasts, bone marrow cells, and dendritic cells to 5-aminolevulinic acid based photodynamic therapy
No full textINTRODUCTION: Photodynamic therapy with 5-aminolevulinic acid (5-ALA-PDT) exerts cell type specific effects on target cells. Since chondrocytes were found to be more resistant than osteoblasts to 5-ALA-PDT, the pre-treatment of osteochondral grafts with 5-ALA-PDT may represent a means to devitalize the osseous portion while maintaining functional cartilage. The present study was designed to determine the effects of 5-ALA-PDT in vitro on cell populations residing in skeletal tissues. METHODS: Osteoblasts, fibroblasts, bone marrow cells, and dendritic cells were incubated with 0.5 mM 5-ALA for 4 h. Protoporphyrin IX (PpIX) accumulation and after exposure to light cellular functions were assessed for up to 6 days. RESULTS: Accumulation of PpIX reached a plateau at 0.5 mM in osteoblasts, fibroblasts, and dendritic cells, and at 2.0 mM in bone marrow cells. At 0.5 mM 5-ALA, similar responses to illumination were observed in all cells with a survival rate of less than 12% at a light dose of 20 J/cm(2). The function of osteoblasts (proliferation, levels of mRNA encoding collagen type I, alkaline phosphatase activity) and fibroblasts (proliferation, levels of mRNAs encoding collagens type I and III) was not affected, when the cells were treated with 5-ALA and light doses of < or =10 J/cm(2). Paralleling the reduction of viable cells after 5-ALA-PDT, the capacity of dendritic cells to stimulate T cells in a mixed leukocyte reaction decreased to 4+/-2% at 20 J/cm(2). CONCLUSION: The investigated cell types were sensitive to 5-ALA-PDT and the residual cell debris did not elicit an allogenic response. These findings, together with the resistance of chondrocytes to 5-ALA-PDT, encourage the further investigation of this protocol in the pretreatment of osteochondral allografts
In vitro resistance of articular chondrocytes to 5-Aminolevulinic acid based photodynamic therapy
No full textOBJECTIVE: 5-Aminolevulinic acid based photodynamic therapy (5-ALA-PDT) has revealed promising results in the treatment of inflammatory joint diseases due to the sensitivity of inflamed synovial tissue. For 5-ALA-PDT to be safe and beneficial for intra-articular applications, resistance of chondrocytes is essential to prevent cartilage damage. As no data yet exist, the aim of the present study was to assess in vitro the response of the chondrocytes to 5-ALA-PDT and to compare with osteoblasts and synovial tissue derived cells. METHODS: Bovine articular chondrocytes, osteoblasts, and synovial cells were subjected to 5-ALA-PDT in cell culture. The PpIX accumulation and the function of the cells were assessed for up to 12 days. RESULTS: Bovine chondrocytes showed lower PpIX fluorescence upon incubation with 5-ALA (0.0-2.0 mM) for 4 hours as compared to osteoblasts and synovial cells suggesting a low PpIX accumulation. After incubation with 0.5 mM 5-ALA and application of light at a dose of 20 J/cm2, chondrocytes were functionally not affected (collagen type II and aggrecan mRNA, glycosaminoglycan synthesis) whereas a decrease in the proportion of viable cells was observed in osteoblasts and synovial cells (2+/-2% and 14+/-8%, respectively; chondrocytes 91+/-13%). Chondrocytes showed a 58% reduction of 5-ALA uptake using [3H]5-ALA as compared to osteoblasts and a lower mitochondrial content as assessed by the activity of the mitochondrial marker enzyme citrate synthase (9.2+/- 3.6 mU/mg protein) than osteoblasts (32.6+/-10.5 mU/mg) and synovial cells (60.0+/-10.8 mU/mg). The reduced uptake of 5-ALA and/or the low mitochondrial content, an adaptation to their in vivo environment and the site of PpIX synthesis, presumably explains the lower PpIX content in chondrocytes and their resistance against 5-ALA-PDT. CONCLUSION: 5-ALA-PDT might represent a treatment strategy in inflammatory joint diseases without endangering the cartilage function. However, further in vitro and in vivo experiments are required to confirm this data in the authentic environment of chondrocytes, the articular cartilage
Die konservative und operative Therapie der unspezifischen Spondylodiszitis
No full textZusammenfassungDie pyogene Spondylodiszitis entsteht meist endogen durch eine Bakteriämie, aber auch exogene Ursachen wie etwa wirbelsäulennahe Infiltrationen können sie hervorrufen. Es besteht eine zunehmende Inzidenz der Erkrankung, die noch immer mit einer signifikanten Mortalität der in vielen Fällen immunsupprimierten und hochbetagten Patienten einhergeht. Eine frühzeitige Diagnosestellung durch Bildgebung und Erregerisolierung ist entscheidend für ein gutes Behandlungsergebnis. Die überwiegende Zahl der Patienten kann konservativ behandelt werden, wichtig sind ein frühzeitiger Beginn der antibiotischen Therapie sowie eine adäquate Ruhigstellung. Operative Therapieziele sind neben der Dekompression und Infektsanierung die Stabilisation und Deformitätenkorrektur. Es kommen rein dorsale offene Verfahren, ggf. mit Ausräumung der Bandscheibe und TLIF, sowie minimalinvasive Stabilisierungen zur Anwendung. Bei ausgeprägten ventralen Destruktionen, Fehlstellungen und Abszedierungen muss durch einen separaten ventralen Zugang debridiert und stabilisiert werden. In der überwiegenden Zahl der Fälle können gute Behandlungsergebnisse erreicht werden, in Einzelfällen bestehen jedoch große therapeutische Herausforderungen. Individuelle Therapieentscheidungen sind notwendig, da einerseits die Literatur keine eindeutigen Behandlungsleitlinien vorgibt und es sich andererseits um teils hochbetagte und multimorbide Patienten handelt.</jats:p
Operative treatment of a winged scapula due to peripheral nerve palsy in Lyme disease: A case report and review of the literature
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In Situ Analysis of Interleukin–23– and Interleukin‐12–Positive Cells in the Spine of Patients With Ankylosing Spondylitis
No full textCartilage in facet joints of patients with ankylosing spondylitis (AS) shows signs of cartilage degeneration rather than chondrocyte hypertrophy: implications for joint remodeling in AS
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