With Irony About the Author

More than a quarter of a century ago, I asked myself the question: why do penguins and people waddle?

I studied the locomotion of people and animals, movement of machines, observed in zoos and museums, studied the structure of birds and human, experimented and analyzed, developed a mathematical apparatus. For the penguins the operation was developed: circular periacetabular osteotomy of the pelvis with rotational transposition of the proximal area of attachment of the ligament of the head of femur (ligamentum capitis femoris, ligamentum teres). A similar operation can improve the gait of some people too.

In the beginning, there was a question...

Track Music: Blue Dot Sessions, Vittoro (CC BY-NC 4.0 DEED / fragment)

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NEWS 2026

New publications of our resource in 2026 The initial phase of collecting data on LCF, accumulated prior to the 20th century, is largely complete. Next, we plan to analyze and synthesize thematic information, adding data from the 20th and 21st centuries. The work will focus primarily on: prevention, diagnosis, arthroscopy, plastic surgery, and endoprosthetics. January 05, 2026 2018YoussefAO The article describes a method for transposition of the proximal attachment of the LCF in congenital hip dislocation. 2007WengerD_OkaetR The authors demonstrated in the experiment that the strength of the LCF is sufficient to ensure early stability during hip joint reconstruction in children. January 04, 2026 2008 BacheCE _TorodeIP The article describes a method for transposition of the proximal attachment of the LCF in congenital hip dislocation . 2021PaezC_WengerDR The ar ticle analyzes the results of open reconstruction of LCF in dysplasia. 2008DoddsMK...

IMPROVING POSTOPERATIVE COMFORT...

Improving Postoperative Comfort and Increasing the Reliability of Hip Prostheses by Supplementing with Artificial Ligaments: Proof of Concept and Prototype Demonstration S.V. Arkhipov, Independent Researcher, Joensuu, Finland CONTENT [i] Abstract [ii] Introduction [iii] Materials and Methods [iv] Results and Discussion [v] Static Tests [vi] Dynamic Tests [vii] Prototype Fabrication and Testing [viii] Conclusion [ix] References [x] Application [i] Abstract The principle of operation of an experimental total hip endoprosthesis augmented with ligament analogs has been demonstrated in single-leg vertical stances and at the mid-stance phase of the single-support period of gait. The experiments were conducted on a specially designed mechatronic testing rig. The concept of the important role of the ligamentous apparatus is further illustrated by a set of demonstrative mechanical models. The...

1970MichaelsG_MatlesAL

Content [i] Annotation [ii] Original text [iii] References [iv] Source & links [v] Notes [vi] Authors & Affiliations [vii] Keywords [i] Annotation Abstract of the article: Michaels G, Matles AL. The role of the ligamentum teres in congenital dislocation of the hip (1970). The authors proposed an analogy for the role of the ligamentum capitis femoris (LCF) as a “ball and chain control” and noted that it can spontaneously reduce congenital hip dislocation. The text in Russian is available at the following link: 1970MichaelsG_MatlesAL . [ii] Original text Quote p. 199 Many papers in the literature have implicated the ligamentum teres as a hindrance to the late open reduction of a congenitally dislocated hip. Occasionally the ligamentum teres has been reported to be absent. However, in most cases it is hypertrophied and elongated. Our present knowledge confirms the fact that congenital dislocation of t...

2008WengerDR_MiyanjiF

Article: Wenger DR et al. Ligamentum teres maintenance and transfer as a stabilizer in open reduction for pediatric hip dislocation: surgical technique and early clinical results (2008). The article describes a method of open reconstruction of the ligamentum capitis femoris (LCF) for hip dysplasia. The text in Russian is available at the following link: 2008WengerDR_MiyanjiF . Ligamentum teres maintenance and transfer as a stabilizer in open reduction for pediatric hip dislocation: surgical technique and early clinical results Wenger DR, Mubarak SJ, Henderson PC, Miyanji F CONTENT [i] Abstract [ii] Introduction [iii] Materials and Methods [iv] Surgical technique & Results [v] Discussion & Conclusion [vi] References [vii] Application [i] Abstract Purpose The ligamentum teres has primarily been considered as an obstruction to reduction in children with developmental dislocation of the hip (DDH). In the ea...

LCF in 2025 (June)

LCF in 2025 ( June ) (Quotes from articles and books published in June 2025 mentioning the ligamentum capitis femoris) Kuhns, B. D., Kahana-Rojkind, A. H., Quesada-Jimenez, R., McCarroll, T. R., Kingham, Y. E., Strok, M. J., ... & Domb, B. G. (2025). Evaluating a semiquantitative magnetic resonance imaging-based scoring system to predict hip preservation or arthroplasty in patients with an intact preoperative joint space. Journal of Hip Preservation Surgery , hnaf027. [i] academic.oup.com Iglesias, C. J. B., García, B. E. C., & Valarezo, J. P. P. (2025) CONTROLLED GANZ DISLOCATION. EPRA International Journal of Multidisciplinary Research (IJMR) - Peer Reviewed Journal. 11(5)1410-13. DOI: 10.36713/epra2013 [ii] researchgate.net Guimarães, J. B., Arruda, P. H., Cerezal, L., Ratti, M. A., Cruz, I. A., Morimoto, L. R., ... & Ormond Filho, A. G. (2025). Hip Microins...

1724FabriciusJA

Fragments from the book Fabricius JA. Bibliothecae Graecae volume duodecimum (1724). The author quotes the Byzantine physician Theophilus Protospatharius, who supposedly lived between the 7th and 10th centuries. Selected passages provide views on the normal anatomy of the ligamentum capitis femoris (LCF) and its inherent connective function. [Grc] θεοφιλος ο Πρωτοσπαθάριος . Περὶ τῆς τοῦ ανθρώπου κατασκευῆς . Βιβλιον Ε . XIII, [p. 892] (see fig.) [Lat] Theophilus Protospatharius. De corporis humani fabrica, Liber quintus, Cap. XIII [p. 892] 1) Dei erga homines amor ex heminae fundo teretem nervum promisit, cartilaginosum vinculum femoris capiti insertum adstringensque, ne facile elabatur:» 2) inde ex heminae oris aliae copulae oriuntur, totum femoris caput in orbem constringentes, non teretes & solae, qualis quae ex fundo porrigitur, sed latae, valenter que heminae oras ad commissurae praesidium ambientes. Translation [Eng] 1) For the sake ...

2011HosalkarHS_WengerDR

Content [i] Annotation [ii] Original text [iii] References [iv] Source & links [v] Notes [vi] Authors & Affiliations [vii] Keywords [i] Annotation Abstract of the article: Hosalkar HS et al . Isocentric reattachment of ligamentum teres: a porcine study (2011). The article describes a method of isocentric fixation of the proximal end of the ligamentum capitis femoris (LCF) during plastic surgery in an experiment on pigs. The text in Russian is available at the following link: 2011HosalkarHS_WengerDR . [ii] Original text Abstract Background: Recent reports reveal interest in the mechanical importance of ligamentum teres (LT) in hip dislocation. In the previously established procedure of anteroinferior acetabular LT reattachment in developmental dysplasia of the hip, the LT functions as a check-rein, showing promising results. However, this position of reattachment could potentially limit motion. Th...

2007WengerD_OkaetR

Content [i] Annotation [ii] Original text [iii] References [iv] Source & links [v] Notes [vi] Authors & Affiliations [vii] Keywords [i] Annotation Abstract of the article: Wenger D et al . The mechanical properties of the ligamentum teres: a pilot study to assess its potential for improving stability in children’s hip surgery (2007). The authors demonstrated in the experiment that the strength of the ligamentum capitis femoris (LCF) is sufficient to ensure early stability during hip joint reconstruction in children. The text in Russian is available at the following link: 2007WengerD_OkaetR . [ii] Original text Abstract The anatomic and histological characteristics of the ligamentum teres and its vascular contributions to the femoral head have been well described. The function of the ligamentum teres remains poorly understood. Although excision is the current standard in treating complete developme...

Tweet of December 31, 2025

The first-principle thinking: the reaction force of the artificial ligaments in the hip prosthesis moves the pelvis when the muscles relax; this can be used for robot walking. D esigned for @elonmusk #Optimus #TeslaBot #arthroplasty #hip_prosthesis . Happy New Year everyone! Tweet of December 31, 2025 #arthroplasty #hip_prosthesis BLOG CONTENT TWITTER OR X

2012FrederickP_KelmanDC

Invention (Patent): Frederick P, Belew K, Jasper L, Gatewood J, Gibson L, Masonis J, Cooper M, Kelman DC. Methods and apparatus for FAI surgeries. US20120283840A1 (2012). US20120283840A1 US Inventors: Phillip Frederick, Kevin Belew, Lauren Jasper, James Gatewood, Luke Gibson, John Masonis, Michael Cooper, David C. Kelman Current Assignee: Smith and Nephew Inc Worldwide applications 2010 KR JP RU BR CA US CN EP CN WO AU 2014 US 2016 AU 2017 AU Application US13/202,612 events: 2010-02-25 Заявка подана Smith and Nephew Inc 2010-02-25 Приоритет US13/202,612 2012-11-08 Публикация US20120283840A1 2014-12-02 Заявка удовлетворена 2014-12-02 Публикация US8900320B2 Статус: Активный 2031-06-08 Измененный срок действия Methods and apparatus for FAI surgeries Phillip Frederick, Kevin Belew, Lauren Jasper, James Gatewood, Luke Gibson, John Masonis, Michael Cooper, David C. Kelman Abstract A partial rim implant for an acetabulum in a pelvic bone comprise...

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