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Comparison of results of ACL reconstruction using LARS method and autogenous ST/GR graft

Płocki Jędrzej, Pelikan Piotr, Bejer Agnieszka, Granek Arkadiusz, Krawczyk-Suszek Marlena, Kotela Ireneusz

Acta of Bioengineering and Biomechanics

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2019

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Vol. 21, no. 1

113--119

EN

The objective of the study was assessment of the function of the knee joint after ACL reconstruction using the LARS method and autogenous graft. The study was of a retrospective character and included 96 patients who had undergone reconstruction of the torn ACL. The study was conducted within 36–48 months after surgery. Methods: In order to compare the results of the ACL reconstruction performed with 2 types of grafts, the following instruments were used: Lysholm Knee Scoring Scale, SF 36v2 questionnaire for assessment of health-related quality of life, and Biodex System 4 for isokinetic muscle testing. Results: No differences in the evaluation of the quality of life measured using SF 36v2 questionnaire were observed between the LARS and ST GR groups. Using the Lysholm Scale, the distribution of knee function scores was compared according to the type of surgery. There are no grounds to confirm the differences in the distribution of knee function scores considering the type of graft ( p = 0.756). Isokinetic test showed a significant weakening of muscle strength in the operated limb, compared to the strength of the healthy limb. Conclusions: The type of graft used for ACL reconstruction does not exert an effect on the quality of life of patients or the level of their knee joint function. Extensor and flexor muscles strength of the knee joint was lower in the operated limb, irrespective of the type of graft used. Weak relationships were observed between the level of knee joint function and extensor muscle strength of this joint.

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Loading rate effect on mechanical properties of cervical spine ligaments

Trajkovski A., Omerovic S., Krasna S., Prebil I.

Acta of Bioengineering and Biomechanics

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2014

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Vol. 16, no. 3

13--20

EN

Mechanical properties of cervical spine ligaments are of great importance for an accurate finite element model when analyzing the injury mechanism. However, there is still little experimental data in literature regarding fresh human cervical spine ligaments under physiological conditions. The focus of the presented study is placed on three cervical spine ligaments that stabilize the spine and protect the spinal cord: the anterior longitudinal ligament, the posterior longitudinal ligament and the ligamentum flavum. The ligaments were tested within 24-48 hours after death, under two different loading rates. An increase trend in failure load, failure stress, stiffness and modulus was observed, but proved not to be significant for all ligament types. The loading rate had the highest impact on failure forces for all three ligaments (a 39.1 % average increase was found). The observed increase trend, compared to the existing increase trends reported in literature, indicates the importance of carefully applying the existing experimental data, especially when creating scaling factors. A better understanding of the loading rate effect on ligaments properties would enable better case-specific human modelling.

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Wpływ własności materiałowych więzadeł na rozkład naprężeń w modelu ząb-więzadła-kość

Gąsiorek D., Gzik M.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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2004

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z. 24

47-52

PL

W przypadku symulacji numerycznych układów biomechanicznych słotną rolę odgrywają przyjęte własności materiałowe. W pracy został pokazany wpływ danych materiałowych więzadeł przyjętych do symulacji numerycznej układu ząb więzadło-kość na rozkład naprężeń w poszczególnych elementach modelu. Dane materiałowe przyjęto na podstawie przeglądu literaturowego. Symulacje numeryczne wykonano wykorzystując metodę elementów skończonych.

EN

In the case of numerical simulations of biomechanical systems, materiał properties are very important. The influence of the ligaments materiał properties on the stress distribution in individual elements of the tooth-ligaments-bone model was presented in this paper. Materiał properties were assumed on the basis of literaturę review. Numerical simulations were performed with the use of finite element method.