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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1916WalmsleyT

Article by Walmsley T. A note on the retinacula of Weitbrecht (1916). The author discusses the embryonic development and relationships of the ligamentum capitis femoris (LCF) in humans and animals. A NOTE ON THE RETINACULA OF WEITBRECHT. By THOMAS WALMSLEY, M.B., Senior Demonstrator in Anatomy, University of Glasgow. The synovial membrane of the hip-joint is in extent and attachment similar to that of other diarthroses, but the retinacula of Weitbrecht (or ligaments of Stanley) lend to it a special interest. These retinacula are readily recognized on the interior of the capsule as flattened bands passing inwards towards the margin of the head of the femur from the attachment of the peripheral capsule. The following description of their constitution may be selected as expressive of current opinion. The retinacula are arranged in three groups, superior, middle, and inferior: structurally, they are synovial covered capsular reflections: morphologic...

LCF in 2026 (August)

LCF in 2026 (August ) (Quotes from articles and books published in August 2026 mentioning the ligamentum capitis femoris) Maldonado, D. R., Schab, A. R., & Domb, B. G. (2026). Improvement in Patient‐Reported Outcomes, High Rate of Return to Sport, and Secondary Surgery Rate Ranging From 0% to 9.8% After Hip Arthroscopy in Dancers and Athletes in Flexibility Sports: A Systematic Review. Arthroscopy, Sports Medicine, and Rehabilitation , e70020. [i] arthroscopyjournals.onlinelibrary.wiley.com Klingele, K., & Strub, D. (2026). Author Response: Considerations and Challenges in Open Reduction With Ligamentum Teres Reconstruction for Pediatric Developmental Dysplasia of the Hip. Journal of Pediatric Orthopaedics . [ii] ovid.com Quesada‐Jimenez, R., Rana, K., Strok, M. J., Kahana‐Rojkind, A. H., Burt, A. K., Sugarman, E. P., & Domb, B. G. (2026). Dual Labral and Ligamentum Ter...

1914JonesFW_MorrisH

We are publishing a chapter from the fifth edition of «Morris's Human Anatomy» (1914). A significant portion of it is dedicated to the ligamentum capitis femoris (LCF). The original text has been edited by Wood Jones. Particularly notable are the illustrations depicting the LCF. Some of them are improved drawings by the first author ( 1879MorrisH ). Quote pp. 276-284 1. THE HIP-JOINT Class. — Diarthrosis. Subdivision. — Enarthrodia. The hip is the most typical example of a ball-and-socket joint in the body, the round head of the femur being received into the cup-shaped cavity of the acetabulum. Both articular surfaces are coated with cartilage, that covering the head of the femur being thicker above where it has to bear the weight of the body, and thinning out to a mere edge below; the pit for the ligamentum teres is the only part uncoated, but the cartilage is somewhat heaped up around its margin. Covering the acetabulum, the cartilage is horseshoe-shaped, a...

1861HoldenL

Fragments from the book Holden L. Human Osteology (1861). The author discusses the attachment and anatomy of the ligamentum capitis femoris (LCF) . In some cases, we have added links to quotations about LCF available on our resource, as well as to publications posted on the Internet. Quote pp. 1 66-167 Acetabulum. Lastly, we come to the "acetabulum." This is so named from its resemblance to an ancient vinegar cup. Observe its great depth and hemispherical form adapted for the secure lodgement of the head of the thigh-bone, and for more or less movement in any direction. It looks downwards and outwards so as to transmit the weight of the trunk directly on to the head of the thigh-bone; and the upper or iliac portion of it is by far the thickest and strongest, since it has to support the whole weight of the trunk in the erect posture. All these points are of interest, because they are characteristic of the human skeleton. There are two notches in the margin or "br...

LCF in 2025 (January)

LCF in 2025 (January) : Quotes from articles and books published in March 2025 mentioning the ligamentum capitis femoris. Alany, A. M. S., Rasul, D., Berzenji, A. I. H., & Berzenji, A. (2025). Early Outcomes of Arthroscopic Versus Open Reduction for Developmental Dysplasia of the Hip in Children: A Randomized Controlled Trial. Cureus , 17 (1). [i] assets.cureus.com Lovelace, D. M., Kufner, A. M., Fitch, A. J., Curry Rogers, K., Schmitz, M., Schwartz, D. M., ... & Teran, R. (2025). Rethinking dinosaur origins: oldest known equatorial dinosaur-bearing assemblage (mid-late Carnian Popo Agie FM, Wyoming, USA). Zoological Journal of the Linnean Society , 203 (1), zlae153. [ii] academic.oup.com Rashwan, A. S., El-Desouky, M., Elbarbary, H., Madbouly, M. A. E., & Khedr, A. (2025). Arthroscopic-assisted reduction for Developmental Hip Dysplasia (DDH) through the sub-adductor ...

14c.Chora_Church

Chora Church (Mosque) in Istanbul, fresco – «Jacob Wrestling with the Angel» (14th cent.). Depicting the circumstances and mechanism of the ligamentum capitis femoris (LCF) injury based on the description in the Book of Genesis: 25 And Ja cob was left alone; and there wrestled a man with him until the breaking of the day. 26 And when he saw that he could not pre vail against him, he struck against the hollow of his thigh ; and the hollow of Jacob's thigh was put out of joint, as he was wrestling with him. … 33 Therefore do the children of Israel not eat the sinew which shrank, which is upon the hollow of the thigh, unto this day; because he struck against the hollow of Jacob's thigh on the sinew that shrank. ( 1922LeeserI , Genesis (Bereshit) 32:25-26,33) More about the plot in our work: Ninth month, eleventh day ( 2024АрхиповСВ. Девятый месяц, одиннадцатый день ). Unknown author – «Jacob Wrestling with the Angel» (14th cent.) fresco Cho...

16с.Archangel_Michael

Icon «Michael the Archangel (in deeds)», stigma «The struggle of Jacob with the angel» (16th cent.). Depicting the circumstances and mechanism of the ligamentum capitis femoris (LCF) injury based on the description in the Book of Genesis: 25 And Ja cob was left alone; and there wrestled a man with him until the breaking of the day. 26 And when he saw that he could not pre vail against him, he struck against the hollow of his thigh ; and the hollow of Jacob's thigh was put out of joint, as he was wrestling with him. … 33 Therefore do the children of Israel not eat the sinew which shrank, which is upon the hollow of the thigh, unto this day; because he struck against the hollow of Jacob's thigh on the sinew that shrank. ( 1922LeeserI , Genesis (Bereshit) 32:25-26,33) More about the plot in our work: Ninth month, eleventh day ( 2024АрхиповСВ. Девятый месяц, одиннадцатый день ). Unknown author – Icon «Michael the Archangel (in deeds)»...

Who, When, and Where Wrote the Book of Genesis?

Who, When, and Where Wrote the Book of Genesis? A Medical Hypothesis By Sergey V. Arkhipov, MD, PhD & Lyudmila N. Arkhipova, BSN CONTENT [i] Abstract [ii] Introduction [iii] Egyptian physician [iv] Asian diviner [v] Conclusion [vi] References [vii] Application [i] Abstract The Book of Genesis is an example of an ancient literary text that contains important medical insights. We propose that it was written in northern Egypt in the late 17th century BCE, approximately ten years after the Minoan eruption. The protograph likely emerged from the collaboration between an Asiatic seer, who rose to the rank of an Egyptian official, and an Egyptian physician-encyclopedist. By refining its dating and authorship, this hypothesis positions Genesis as a credible source of medical and historical data, thereby enhancing its value for interdisciplinary research. [ii] Introduction According to Rabbinic Judais...

150-200Pseudo-Galen

Fragment from the treatise Pseudo-Galen Introduction, or the Physician ( Εἰσαγωγὴ ἢ Ἰτρός ; Introductio, seu Medicus; ca. 150-200 [our opinion]). The author notes the connecting function of the ligamentum capitis femoris (LCF) and also specifies the proximal and distal attachment sites. See our commentary at the link: 150-200Pseudo-Galen [Rus]. Quote [Grc] Εἰσαγωγὴ ἢ Ἰτρός . K εφ . ιβ . [ Περί όστεολογἰας .] μηρου δέ έν μεν οστούν . συμβάλλει δε επικεκαμμένη μετρίως τη κεφαλή αυτού εις βαθείαν κοτύλην του ισχίου και νεύρῳ απήρτηται εκφυομένω εκ μέσης της κοτύλης και εμφυομένω εις μέσην την κεφαλήν του μηρού . (original source: 1827KühnCG, pp. 723-724) [Lat Introductio, seu Medicus. Cap. XII. [De osteologia] Femoris os unum est, cujus caput leniter reflexum in coxae profundum sinum conjicitur. Quam commissuram nervus, qui e medio sinu prodit et in medium femoris caput inseritur, continet. (original source: 1827KühnCG, pp. 723-724) Translation [Eng] Introduction, or the Phy...

1740KulmusJA

Fragments from the book Kulmus JA. Tables anatomiques (1734). The author briefly writes about the anatomy, properties and attachment of the ligamentum capitis femoris (LCF). There are known translations of the treatise into Latin ( 1732KulmusJA ) and French ( 1734KulmusJA ). Quote p. 51 [Deu] Translation [Eng] с . In the upper part of the head there is a recess in which the round ligament is attached. Quote p. 54 [Deu] Translation [Eng] 2.) The round ligament is short but very strong; it arises at the bottom of the acetabulum and joins the fossa at the top of the femoral condyle. External links Kulmus JA. Anatomische Tabellen: Nebst dazu gehörigen Anmerckungen und Kupffern, Daraus des gantzen Menschlichen Cörpers Beschaffenheit und Nutzen deutlich zu ersehen; Welche Den Anfängern der Anatomie zu bequemer Anleitung verfasset hat… Nuremberg, Frankfort, Leipzig: J.A. von Creutz, MDCCXXXX [1740]. [ archive.org ] Authors & Affiliations Johann Adam Kulmus (...

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