2016ArkhipovaAS Classification of Joints with Flexible Elements.

Classification of Joints with Flexible Elements

The classification of joints with flexible elements was first proposed by A.S. Arkhipova in 2016 and presented at conferences in 2016-2017 (2017АрхиповаАС).

Joints with flexible elements are divided by the author into detachable and non-detachable, three-axis, two-axis, and single-axis. Each can contain in various combinations one or more external and internal flexible elements - analogs of joint ligaments, including the ligamentum capitis femoris (LCF).

Conditional designations of joints with flexible elements using the example of a ball joint:

Detachable ball joint with an internal flexible element

Non-detachable ball joint with an internal flexible element

Detachable ball joint with an external flexible element

Non-detachable ball joint with an external flexible element

Detachable ball joint with both internal and external flexible elements

Non-detachable ball joint with both internal and external flexible elements

Flexible elements can be used to secure the head in the socket, as well as to change the trajectory and range of motion of the joint. The length of the flexible elements and the location of their attachment points play an important role. Joints with flexible elements can be used inin pedipulators of walking machines, robots, and exoskeletons, as well as in endoprosthetics of human and animal joints.

Author and Organization:

Arkhipova Alexandra Sergeevna

Currently (2024) a 6th-year student at the MSU Faculty of Mechanics and Mathematics (Механико-математический факультет Московского государственного университета имени М.В. Ломоносова)

References:

Arkhipova AS. Study of properties of joints with flexible elements for biomorphic walking technology. Research work, conducted at the Lyceum of Scientific and Engineering Profile. Korolev, 2016. [in Russian] (Архипова АС. Изучение свойств шарниров с гибкими элементами для биоморфной шагающей техники. Научно-исследовательская работа, выполненная в АОУ Лицей научно-инженерного профиля. Королёв, 2016.)

Arkhipova AS. Study of properties of joints with flexible elements for biomorphic walking technology. Presentation of the report. Moscow, 2017. [in Russian] (Архипова АС. Изучение свойств шарниров с гибкими элементами для биоморфной шагающей техники. Презентация доклада. Москва, 2017.)

Keywords:

joints with flexible elements, classification

In translating to English, the author is assisted by ChatGPT (version 3.5) and the Google Translate service.

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REVIEWS AND CLASSIFICATIONS

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Catalog. LCF of Extinct Species

Discussion of the LCF and morphological signs of its existence in extinct species. Funston, G. F. (2024). Osteology of the two-fingered oviraptorid Oksoko avarsan (Theropoda: Oviraptorosauria). Zoological Journal of the Linnean Society, zlae011. [ academic.oup.com ] Hafed, A. B., Koretsky, I. A., Nance, J. R., Koper, L., & Rahmat, S. J. (2024). New Neogene fossil phocid postcranial material from the Atlantic (USA). Historical Biology, 1-20. [ tandfonline.com ] Kuznetsov, A. N., & Sennikov, A. G. (2000). On the function of a perforated acetabulum in archosaurs and birds. PALEONTOLOGICAL JOURNAL C/C OF PALEONTOLOGICHESKII ZHURNAL, 34(4), 439-448. [ researchgate.net ] Romer, A. S. (1922). The locomotor apparatus of certain primitive and mammal-like reptiles. Bulletin of the AMNH; v. 46, article 10. [ digitallibrary.amnh.org , digitallibrary.amnh.org(PDF) ] Słowiak, J., Brusatte, S. L., & Szczygielski, T. (2024). Reassessment of the enigmati...

LCF in 2025 (November)

LCF in 2025 ( November ) (Quotes from articles and books published in October 2025 mentioning the ligamentum capitis femoris) Awad, A., Rizk, A., ElAlfy, M., Hamed, M., Abdelghany, A. M., Mosbah, E., ... & Karrouf, G. (2025). Synergistic Effects of Hydroxyapatite Nanoparticles and Platelet Rich Fibrin on Femoral Head Avascular Necrosis Repair in a Rat Model. Journal of Biomedical Materials Research Part B: Applied Biomaterials , 113 (11), e35672. [i] onlinelibrary.wiley.com Loughzail, M. R., Aguenaou, O., Fekhaoui, M. R., Mekkaoui, J., Bassir, R. A., Boufettal, M., ... & Lamrani, M. O. (2025). Posterior Fracture–Dislocation of the Femoral Head: A Case Report and Review of the Literature. Sch J Med Case Rep , 10 , 2483-2486. [ii] saspublishers.com , saspublishers.com Vertesich, K., Noebauer-Huhmann, I. M., Schreiner, M., Schneider, E., Willegger,...

2025ChenJH_AcklandD

The article by Chen JH, Al’Khafaji I, Ernstbrunner L, O’Donnell J, Ackland D. Joint contact behavior in the native, ligamentum teres deficient and surgically reconstructed hip: A biomechanics study on the anatomically normal hip (2025). The authors experimentally demonstrated the role of the ligamentum capitis femoris (LCF) in unloading the upper sector of the acetabulum and the femoral head. The text in Russian is available at the following link: 2025ChenJH_AcklandD . Joint contact behavior in the native, ligamentum teres deficient and surgically reconstructed hip: A biomechanics study on the anatomically normal hip By Chen JH, Al’Khafaji I, Ernstbrunner L, O’Donnell J, Ackland D. CONTENT [i] Abstract [ii] Introduction [iii] Materials and methods [iv] Results [v] Discussion and Conclusion [vi] References [vii] Application [i] Abstract Background The ligamentum teres is known to contribute to hip joint st...

1816MeckelJF

The author discusses the anatomy and function of the ligamentum capitis femoris (LCF), and also identifies one of the reasons for its damage. The translation was done in collaboration with ChatGPT 3.5. Meckel JF. Handbuch der menschlichen Anatomie. Zweiter Band. Besondere Anatomie. Halle, Berlin: Buchhandlung des Hallischen Waisenhauses, 1816. [fragment] Quote p p . 3 65 -366 c. Runds band §. 948. Gerade vor dem Theile der Synovialhaut, welcher auf der Lücke unter dem brückenförmigen Theile der Knorpellippe liegt, entspringt ein, ungefähr einen Zoll langes, sehr länglichviereckiges Band, das runde Band des Oberschenkels (Ligamentum ossis femoris teres s. rotundum) welches, an beiden Enden etwas ausgebreitet, sich mit seis nem äußern an die Bertiefung im Kopfe des Oberschenkels beines heftet und zu noch größerer Befestigung deffelben beiträgt. Es besteht aus longitudinalen Fasern, welche sich an das obere un...

BIBLICAL DAMAGE

Biblical damage (Artists and sculptors on the LCF damage described in the Bible: painting, sculpture, icon, fresco, engraving…) 386Brescia_Casket Bas-relief. Drawing depicting the circumstances and mechanism of the LCF injury. 6c.Vienna_Genesis Miniature. Drawing depicting the circumstances and mechanism of the LCF injury. 10c.Cross Bas-relief. Drawing depi cting the circumstances and mechanism of the LCF injury. 1000Jacob&Archangel Fresco. Drawing depicting the circumstances and mechanism of the LCF injury. 1050Aelfric Drawing depicting the circumstances and mechanism of the LCF injury. 1140St.Marie-Madeleine Capital. Drawing depicting the circumstances and mechanism of the LCF injury. 1143 Palantine_Chapel Mosaic . Drawing depicting the circumstances and mechanism of the LCF injury. 1213L’histoire_ancienne. M iniature . Drawing depicting the circumstances and mecha...

1832MeckelJF

Fragments of the book Meckel JF. Manual of general, descriptive, and pathological anatomy (1832) dedicated to ligamentum capitis femoris (LCF). The author briefly discusses abnormalities of the LCF and its distal insertion. Quote p. 257 § 308. Among the deviations from the normal state, primitive deviations of the external form are rare, and usually attend anomalies of the other tissues. Among these we arrange, for instance, the absence of the tendons of the abdominal muscles, that of the ligaments of the vertebral column, and that of the dura mater of the brain and spinal marrow, &c., in a congenital fissure of the abdomen, of the vertebral column, and of the skull, and that of the tendons and the muscles of a finger, when the finger itself is wanting. But the fibrous organs are seldom deficient, when the other tissues with which they combine to form a part are present — for instance, the tendon alone of a muscle is rarely absent, or the tunica sclerotica, when the othe...

1884SuttonJB

Fragments from the article Sutton JB. Ligaments: Their Nature and Morphology (1884). The author discovered that in the ostrich the ligamentum capitis femoris (LCF) was not continuous with the ambiens muscle, but with a muscular slip which ran parallel with the-muscle, and ended in the adductor mass. This publication develops the theme of article 1883SuttonJB . Quote pp. 228-229 I must now pass on to consider certain ligaments of the appendicular skeleton, commencing with some additional remarks on the ligamentum teres. The Journal of Anatomy and Physiology, vol. xvii January 1883, contains a short article on the ligamentum teres, in which I have endeavoured to point out that many ligaments are the tender of muscles which were originally in relation with the joint; but the parent muscle has either formed new attachments or become obsolete, whilst the tendon remains as a passive element in the articulation. In addition to the ligamentum teres the following structures ...

2025VertesichK_ChiariC

Content [i] Annotation [ii] Original text (in German) [iii] References [iv] Source & links [v] Notes [vi] Authors & Affiliations [vii] Keywords [i] Annotation Fragments from the article: Vertesich K, Noebauer-Huhmann IM, Schreiner M, Schneider E, Willegger M, Böhler C, Windhager R, Chiari C. The position of the femoral fovea can indicate hip instability and highly correlates with lesions of the ligamentum teres: an observational study (2025). The authors discuss the diagnosis of pathology of the ligamentum capitis femoris (LCF) based on radiological & MRI data. The text in Russian is available at the following link: 2025VertesichK_ChiariC . [ii] Original text (in German) The position of the femoral fovea can indicate hip instability and highly correlates with lesions of the ligamentum teres: an observational study Klemens Vertesich, Iris-Melanie Noebauer-Huhmann, Marku...

2024MiglioriniF_MaffulliN

Abstract and table 4 ( overview of LCF tear classification ) of the article Migliorini F et al. The ligamentum teres and its role in hip arthroscopy for femoroacetabular impingement: a systematic review. (2024). Translation into Russian is available at the link: 2024MiglioriniF_MaffulliN . Systematic Review / Open access / Published: 20 December 2024 The ligamentum teres and its role in hip arthroscopy for femoroacetabular impingement: a systematic review Filippo Migliorini, Federico Cocconi, Tommaso Bardazzi, Virginia Masoni, Virginia Gardino, Gennaro Pipino, Nicola Maffulli Journal of Orthopaedics and Traumatology volume 25, Article number: 68 (2024) Abstract Background The ligamentum teres (LT) has received attention in patients undergoing hip arthroscopy (HA) for femoroacetabular impingement (FAI). Indeed, a better understanding of the function of the LT and its implications for cli...

1869MivartG

The author discusses his observations of LCF absence in chimpanzees and orangutans. IX. Contributions towards a more complete knowledge of the Skeleton of the Primates . By Sr. George Mivart, F.L.S., Lecturer on Comparative Anatomy at St. Mary's Hospital. Part I. The Appendicular Skeleton of Simia. Read December 13th, 1866. [Pirates XXXV. to XLIII.] Quote p. 200 It is commonly asserted that the ligamentum teres is absent in. the Orang, as also the pit for its reception on the head of the femur (1). I find no trace of the latter in either femur of any specimen, with one exception (2); but in that. exceptional specimen each femur (Pl. XL. fig. 7 i) exhibits a small but distinct depression on its head in the place occupied in other forms by the pit for the round ligament. This absence has not, as far as I am aware, been noticed in Man or the Chimpanzee; but. in the Gorilla I have sometimes been unable to detect any trace of such a fossa on the head of the femu...

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