RESUMO

PURPOSE: To investigate the metal screw-in anchor failure mode and load to failure for 2 different eyelet alignments after anchor insertion in ovine humeri. METHODS: Sixteen ovine humeri were dissected, and a 5-mm metal anchor with 2 nonabsorbable polyblend polyethylene sutures was inserted into them in the proximal position of the greater tuberosity. The alignment of the anchors after insertion was adjusted to make 2 test groups, each with 8 specimens: In group 1, the anchor eyelets were malpositioned, whereas in group 2, the anchor eyelets were aligned according to the manufacturer's instructions. After insertion, cyclic tests from 10 N to 180 N were performed with a frequency of 1 Hz for 200 cycles; specimens were then loaded to failure to evaluate the maximum load of the system and observe the associated failure mode. RESULTS: The mean ultimate failure load in group 2 was not significantly different from that in group 1 (P = .472). CONCLUSIONS: For metallic screw-in suture anchors, the alignment of the eyelet does not change the failure mode and the load to failure after cyclic loading of the bone-anchor-suture system in ovine humeri. CLINICAL RELEVANCE: Our results indicate that on the basis of this anchor model, the position of the eyelet in the greater tuberosity does not interfere directly with the biomechanical performance of the system.

RESUMO

Um interesse cada vez maior na reconstrução dupla banda do LCA tem estimulado um grande avanço nesta área de pesquisa e levado a um aumento no nosso conhecimento de anatomia, cinemática e função do joelho. Estudos recentes têm melhor definido o tamanho e orientação das inserções femorais e tibiais das bandas ântero-medial e póstero-lateral do LCA. O objetivo da reconstrução anatômica do LCA é utilizar esses novos conceitos para melhorar a técnica cirúrgica e mimetizar a anatomia original do LCA. Acreditamos que a reconstrução anatômica do LCA irá resultar em uma melhora na biomecânica e, consequentemente, uma melhora no quadro funcional de cada paciente.

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RESUMO

People are all lhe time looking for ways to improve their daily lives, but lhey create shorter pathways calied shortcuts to reach the desired destination. Very high steps are an example of this situation present in our daily lives, like stairs in lhe regular walking pathway. People do not usually realize all lhe musculoskeletal problems involved in these situations. The purpose of this study is the step ascent movement analysis with cinematographic — SPICA DMAS for the kinematics acquisition, dynamometric using two force platforms devices and anthropometrics data analyzing the temporal, magnitude, and knee flexion angle aspects related to the ground reaction force. In this study different step heights, 20 cm, 40 cm and 60 cm were used, found in daily life pathways and regular walking situations. Sixteen physically active people ranging in height from 1.55 m to 1.86 m participated as subjects. A self-controlled speed (average 3.95 km/h) in the step ascent was performed for all subjects. The maximum peak of ground reaction force, impact, stance and swing time, the double landing step and knee fexion angle were analyzed. In the second peak increased force was verified when the subject was ascending the step. Ninety degrees of knee flexion angle and over for lhe 40cm step and 60 cm step were regislered, characterizing high compressive forces around the knee joint. Step dimensions, therefore, influenced the kinematics of the lower limb during this study. The authors can conclude that high step are a challenge for people in their daily lives and this can expose the musculoskeletal system to injuries due to the compressive force around the lower limb joints

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