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A projectof the effect of surgical repair or reconstruction on the function of the hip labrum is critical to the advancement of hippreservation surgery; however, validated models of the hip that allow the quantification of labral function in functional joint positions have yet to be developed. PURPOSE:To evaluate (1) whether intra-articular pressures within the hip are regulated by fluid transport between the labrum and femoral head and (2) whether the sealing capacity of the labrum varies with joint posture. STUDY DESIGN:Descriptive laboratory study. METHODS:The sealing ability of the hip labrum was measured during fluid infusion into the central compartments of 8 cadaveric specimens. Additionally, the pathway of fluid transfer from the central to the peripheral compartment was assessed via direct visualization in 3 specimens. The effect of joint posture on the sealing capacity of the labrum was determined by placing all 8 specimens in 10 functional postures. The relationship between pressure resistance and 3-dimensional motion of the femoral head within the acetabulum was quantified using motion analysis and computer modeling. RESULTS:Resistance to fluid transport from the central compartment of the hip was directly controlled by the labrum during loading. Maximum pressure resistance was affected by joint posture (P = .001). Specifically, positions that increased external rotation of the joint (pivoting) provided an improved seal, while positions that increased flexion combined with internal rotation (stooping) augmented the ease of fluid transport from the central to the peripheral compartment. Maximum pressure resistance was associated with the distance between the labrum and femoral head during pivoting. CONCLUSION:This study demonstrated that the transfer of fluid from the central compartment of the hip occurs at the junction of the labrum and femoral head. Joint position was shown to strongly affect the sealing function of the labrum and was attributable to the distance between the labrumand femoral head in certain positions. CLINICAL RELEVANCE: Altering the relationship between the labrum and femoral head may disrupt the sealing ability of the labrum, potentially leaving the joint at risk for pathological changes with time.
Whether ratios are leverage or profitability ratios. If a leverage ratio, is it coverage or capital structure? What is the dissimilarity between the two? If a profitability ratio, examine why it is not completely satisfactory for measuring an organiz..
The heart is in the middle thoracic cavity, known as the ______. The membrane around the heart is the ______. The thick muscular wall of the heart is the ______. The smooth inner lining of the heart is the ______.
examine transcription, including such things as the location in the cell, transcription signals, products, chemical details, and/or the amount of chromosome involved.
What basic similarities among mammals and differences between mammals (the ingroup) and reptiles (an outgroup) help support the hypothesis that all mammals share a common ancestor.
In explaining their findings, the authors have ignored a major threat to the validity of their estimates of exposure. Explain and discuss this error.
Explain how one of these main concepts is connected to your own personal observations. Clearly describe two methodological problems associated with the way Scientists study the topic.
Most human obesity does not follow Mendelian inheritance patterns, because body fat content is estimated through a number of interacting genetic and environmental variables.
An organism has a diploid chromosome number of 12. How many chromatids will be visible during metaphase of mitosis? How many chromosomes will be visible at the end of anaphase in mitosis? For the similar organism, how many chromosomes will be present..
Consider a transmembrane protein complex that forms a hydrophilic pore across the plasma membrane of a eukaryotic cell. The pore is made of five similar protein subunits, each of which contributes a membrane-spanning alpha-helix to form the pore.
specify the amino acid sequences
In detail explain the structure and function of the heart and blood flow. Include the conduction system and blood vessels. Provide your response specific to your audience who are a group of lay people without a background in science.
From a bacteria stock you serially dilute 1/100 two times, then serially dilute 1/10 two times. From this last tube you plate 100 ul, which produces 156 colonies the other day.
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