Heiner Martin

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Dislocation remains a serious complication of total hip replacement. An insufficient range of motion can lead to impingement of the prosthetic neck on the acetabular cup. Together with the initiation of subluxation and dislocation, recurrent impingement can cause material failure in the liner. The objective of this study was to generate a validated finite(More)
Vertebroplasty and kyphoplasty are well-established minimally invasive treatment options for compression fractures of osteoporotic vertebral bodies. Possible procedural disadvantages, however, include incomplete fracture reduction or a significant loss of reduction after balloon tamp deflation, prior to cement injection. A new procedure called “vertebral(More)
Abstract Background. Our objective was to develop a three-dimensional high-resolution ultrasonic imaging technique to be utilized for in-vivo characterization of the ciliary body and the posterior iris. The benefit of this imaging in enhancing the quantification of the configurational changes in the ciliary body during accommodation is demonstrated.(More)
Biomechanical modelling of the accommodation process is a useful tool for studying the mechanism of accommodation and presbyopia and can aid in the development of accommodative lens-replacing materials. Existing biomechanical models, however, use a very simplified zonula structure. The aim of this study was to use three-dimensional ultrasonic imaging and(More)
Sensory information from muscle is a major factor in the control of posture and movement. The central nervous system can greatly vary this proprioceptive feedback via the fusimotor (gamma) system that innervates the muscle spindle, a length receptor. Despite 50 years of intensive research, the role of the fusimotor system still remains controversial. One of(More)
PURPOSE The accommodation process of the human eye is still a controversial subject. Coleman assumes that the lens, together with the zonula fibers, forms a diaphragm which is held in a catenary shape due to the pressure difference between the aqueous and vitreous body of the lens. The aim of the paper is to compare the results of two simulations (according(More)
BACKGROUND The etiology of subchondral bone cysts in arthrotic joints is unclear. MATERIALS AND METHODS We used two-dimensional finite element analysis to evaluate the hypothesis that subchondral bone cysts in the osteoarthrotic hip joint may be the result of microfractures caused by localized cartilage defects or a thinned layer of cartilage. We(More)
We have investigated the effects of interleukin-2 on identified cutaneous C- and A delta- fibre nociceptors in an in vivo rat saphenous nerve preparation. A fraction of C-polymodal (33%), A delta- (22%) and C- (7.5%) mechanical nociceptors were activated by intradermal injection of interleukin-2. For C-fibre polymodal nociceptors, concentration thresholds(More)
A system of automated microscopic picture analysis was used in an examination of 272 gliomas (70 glioblastomas, 91 astrocytomas, 56 pilocytic astrocytomas or spongioblastomas, and 55 oligodendrogliomas). The specimens were prepared as Feulgen sections, 4μm in thickness. Thirteen morphometricdensitometric parameters of tumor cell nuclei were tested together(More)
Tumours of the neuroglia, 172 in all (50 glioblastomas, 65 fibrillar and gemistocytic astrocytomas, 26 pilocytic astrocytomas and 31 oligodendrogliomas), were studied by automated microscopic picture analysis. Thirteen morphometric and densitometric parameters of the tumour cell nuclei as well as two mitotic parameters were determined on 4 μm thick Feulgen(More)