Lydia Ragan

• Høgevold, Magnus; Alm, Carl Erik; Wright, Bryan Joseph; Ragan, Lydia; Frihagen, Frede & Röhrl, Stephan Maximilian [Show all 8 contributors for this article] (2025). The impact on lateral wall fractures by a sliding hip screw device in trochanteric fractures a biomechanical study. Bone & Joint Open (BJO). 6(5), p. 582–589. doi: 10.1302/2633-1462.65.BJO-2024-0266.R1. Full text in Research Archive Show summary

  Aims Trochanteric fractures with a reduced lateral wall thickness and a detached lesser trochanter are unstable. These characteristics can lead to failure through a lateral wall fracture after fixation with a sliding hip screw device (SHS). However, the precise mechanism by which these characteristics contribute to lateral wall fractures remains unclear. Accordingly, we examined the impact on failure by incremental decrease of both lateral wall thickness and lesser trochanter attachment in trochanteric fracture fixation using a SHS ex vivo. Methods We tested 14 pairs of embalmed femora, randomly assigned to four osteotomy groups, each representing a specific 31A1 or 31A2 fracture pattern according to the AO/Orthopaedic Trauma Association (OTA) classification. After fixation with a SHS, the specimens underwent quasi-static and dynamic axial compression until failure. Outcome measures included stiffness, deformation, load to failure, and failure pattern following a set protocol. Results We found lateral wall fractures in ten out of 28 specimens. Specimens with a thin lateral wall and a detached lesser trochanter exhibited both a significantly higher rate of lateral wall fractures (5/7 vs 5/21, p = 0.023) and a lower load to failure than specimens with only one or none of these characteristics (1,673 N (SD 810) vs 2,922 N (SD 897), p = 0.003). The specimens with a detached lesser trochanter themselves demonstrated a significantly higher rate of lateral wall fractures than those with an attached lesser trochanter (9/14 vs 1/14, p = 0.004). Conclusion Our findings emphasize the role of a detached lesser trochanter in initiating lateral wall fractures, with a reduction in load to failure when combined with reduced lateral wall thickness. Biomechanically, this suggests a failure mechanism whereby placing a load-sharing implant could overload a fragile lateral wall in unstable trochanteric fractures.

• Wright, Brian; Ragan, Lydia; Niratisairak, Sanyalak; Høiseth, Arne; Strømsøe, Knut & Steen, Harald [Show all 7 contributors for this article] (2018). High correlation between mechanical properties and bone mineral parameters in embalmed femurs after long-term storage. Clinical Biomechanics. ISSN 0268-0033. 59, p. 136–142. doi: 10.1016/j.clinbiomech.2018.09.013. Full text in Research Archive
• Ragan, Lydia; Waczulíková, Iveta; Bilický, Jozef; Guller, Ladislav & Benuska, Jozef (2013). Minimum Intercaudate Distance - A Reliable Marker of Enlarged Brain Lateral Ventricles in Women, Morphology 2013: Book of Abstracts of the 43rd International Congress of the Slovak Anatomical Society and 50th Lojda Symposium on Histochemistry, Martin, June 4 - 6, 2013, Slovak Republic. Univerzita Komenského v Bratislave, Jesseniova lekárska fakulta v Martine, Slovenská republika [Comenius University in Bratislava, Jessenius Faculty of Medicine in Martin, Slovakia]. ISSN 9788089544479. p. 62–62. Full text in Research Archive
• Ragan, Lydia (2013). Študijný plán Oslo96 (Curriculum Oslo96), Anatomické štruktúry a laparoskopia. Vydavateľstvo ÚNIA. ISSN 9788097058982. p. 71–73. Full text in Research Archive
• Ragan, Lydia; Waczulíková, Iveta; Bilický, Jozef; Guller, Ladislav & Benuska, Jozef (2009). Lineárne rozmety versus objem? Aká je v skutočnosti výpovedná hodnota lineárnych parametrov? [Linear Measures Versus Volume? What is in Fact the Relevance of Linear Parameters?]. Slovenská rádiológia. ISSN 1335-0625. 16(1), p. 40–45. Full text in Research Archive
• Ragan, Lydia; Waczulikova, I; Guller, L; Bilicky, J & Benuska, J (2009). CELLA MEDIA DISTANCE IN HUMAN BRAIN IN RELATION TO AGE AND GENDER. Biomedical Papers of the Faculty of Medicine of Palacky University. ISSN 1213-8118. 153(4), p. 307–313. Full text in Research Archive
• Ragan, Lydia; Guller, Ladislav; Benuska, Jozef & Bilicky, Jozef (2008). Ako ovplyvňuje vek a pohlavie vzdialenosť medzi nuclei caudati – jeden z indikátorov veľkosti bočných mozgových komôr? [How is Intercaudate Distance – an Indicator of Brain Lateral Ventricles Size – Influenced by Age and Sex?]. Slovenská rádiológia. ISSN 1335-0625. 15(2), p. 3–8. Full text in Research Archive
• Ragan, Lydia; Benuska, Jozef & Bilicky, Jozef (2008). Cavum septi pellucidi a cavum vergae: Vývojové a morfologické aspekty. [Cavum Septi Pellucidi and Cavum Vergae: Developmental and Morphological Aspects.]. Slovenská rádiológia. ISSN 1335-0625. 15(2), p. 21–24. Full text in Research Archive
• Ragan, Lydia; Benuska, Jozef & Bilický, Jozef (2008). Incidencia cavum septi pellucidi a cavum vergae: Poukazuje prítomnosť týchto dutín na prítomnosť ochorenia? [Incidence of Cavum Septi Pellucidi and Cavum Vergae: Are these Cavities a Disorder Indication?]. Slovenská rádiológia. ISSN 1335-0625. 15(2), p. 14–17. Full text in Research Archive

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• Wright, Bryan; Ragan, Lydia; Brattgjerd, Jan Egil; Niratisairak, Sanyalak; Steen, Harald & Høiseth, Arne [Show all 7 contributors for this article] (2016). Validering av formalinfikserte humane lårben til biomekaniske studier. Full text in Research Archive
• Ragan, Lydia; Waczulíková, Iveta; Bilicky, Jozef; Guller, Ladislav & Benuska, Jozef (2013). Minimum intercaudate distance - a reliable marker of enlarged brain lateral ventricles in women. Full text in Research Archive
• Ragan, Lydia; Waczulíková, Iveta; Bilický, Jozef; Guller, Ladislav & Benuska, Jozef (2013). Minimum intercaudate distance - A reliable marker of enlarged brain lateral ventricles in women. Revista Argentina de Anatomía Clínica. 5(2), p. 170–170. Full text in Research Archive
• Ragan, Lydia (2008). Predhovor k prvému slovenskému a českému vydaniu. p. IX–IX. Full text in Research Archive

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