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001-es BibID:	BIBFORM101269
035-os BibID:	(WoS)000778960800003 (Scopus)85127403337
Első szerző:	Csernátony Zoltán (ortopéd sebész, traumatológus)
Cím:	The roof step cut : a novel technique for bony reconstruction of acetabular roof deficiency during total hip replacement / Csernátony Zoltán, Győrfi Gyula, Barna Sándor, Manó Sándor, Szabó János, Zhang Lei
Dátum:	2022
ISSN:	2687-4784 2687-4792
Megjegyzések:	Objectives: This study aims to present a new technique, the roof step cut (RSC), for acetabular augmentation of hip dysplasia. Patients and methods: Between December 2008 and March 2020, we applied the RSC technique in a total of 48 hips of 41 patients (2 males, 39 females; mean age: 50.1 +/- 9.5 years; range, 30 to 75 years) with Hartofilakidis type A, B, C hip dysplasia. The RSC technique uses a L-shaped graft cut from the femoral head. The graft is partially inside the acetabulum and partially on the lateral aspect of the ilium. It is fixed with two screws at a 45 degrees angle allowing simultaneous distalization and lateral covering of the cementless cup. Follow-up was done at six weeks, three months, and annually thereafter using standard pelvis anteroposterior X-ray and function scores. The 99mTc bone scintigraphy examination was also performed at around two weeks, six months, and 12 months postoperatively to evaluate the healing process of the graft. Results: The mean follow-up time was 59.6 +/- 25.6 (range, 12 to 109) months. No significant center-edge angle changes and no contiguous radiolucent zones at the bone prosthesis interface were observed at the final follow-up. The single-photon emission tomography (SPECT) showed the activity of the bone graft gradually increased after surgery and became almost the same as the reference area after 12 months. Functional evaluation showed a significant improvement after the operation. No complication directly related to the technique was observed. Conclusion: In the short-term follow-up, the RSC technique is a reliable procedure for acetabular augmentation of hip dysplasia, providing enough coverage for the cementless cup and assuring proper stability.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Joint Diseases and Related Surgery. - 33 : 1 (2022), p. 9-16. -
További szerzők:	Győrfi Gyula (1982-) (orvos) Barna Sándor (1982-) (kutató orvos) Manó Sándor (1977-) (gépészmérnök, számítógépes tervezőmérnök) Szabó János (1966-) (ortopéd sebész) Zhang, Lei (1988-) (orvos)
Pályázati támogatás:	Bridging Fund 2021 University of Debrecen, Faculty of Medicine Egyéb
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM113757
035-os BibID:	(WoS)001113651800001 (Scopus)85175274528
Első szerző:	Zhang, Lei (orvos)
Cím:	Biomechanical Comparison of the Roof Step Cut Technique with the Bulk Bone Graft Technique During Total Hip Arthroplasty for Hip Dysplasia : a Finite Element Analysis / Lei Zhang, Rashwan Alkentar, Sándor Manó, János Szabó, Tamás Mankovits, Zoltán Csernátony
Dátum:	2023
ISSN:	0001-5415
Megjegyzések:	PURPOSE OF THE STUDY Different techniques have been reported to reconstruct the deficient acetabulum during total hip arthroplasty (THA). The purpose of this study was to compare the biomechanical features of the bulk bone graft (BBG) technique (Harris acetabular plasty) and the Roof Step Cut (RSC) technique using finite element analysis. MATERIAL AND METHODS Based on a female patient's dysplastic hip CT scan, 3D models were assembled according to the two techniques. For the Harris technique, an irregular BBG was sculpted from a solid sphere, while for the RSC technique, the graft was sculpted into a step-cut shape with a similar size. Each graft was fixed with two compression screws at two different angles (0 degrees and 45 degrees). Four finite element models were used to compare the von Mises stress distribution and total deformation of the grafts and the screws. The pressure and sliding distances of the contacts between the bone graft, metal cup and acetabular host bone were also analyzed. RESULTS For both of the bone grafts and the screws, compared to the Harris models, the maximum stress of the RSC models was significantly lower (16.56 MPa, 25.50 MPa vs 97.13 MPa, 112.72 MPa) and the total deformation was significantly smaller (0.0096mm, 0.0089mm vs 0.022mm, 0.018 mm). 45 degrees inserted screws generated higher stress at the end of the screws and on the outside of the bone graft. In case of 0 degrees inserted screws, the maximum value was mainly located in the middle of the screws, inside the screw channel as well as at the contact area between the graft and the host bone. At all analyzed contacts, the RSC technique shows significantly lower pressure and sliding distances, irrelevant to the screw's insertion angle. In comparison, the model of BBG with 45 degrees screws showed a significant sliding effect and higher contact pressure. CONCLUSIONS Compared with the BBG technique, the step-shaped graft of the RSC technique could significantly reduce the maximum stress and deformation of the graft and the screws, and decrease the pressure and sliding distance between the bone graft, metal cup and the acetabular host bone. The angle of screw placement affects the location of stress and deformation.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca. - 90 : 5 (2023), p. 301-313. -
További szerzők:	Rashwan, Alkentar (1985-) (topology optimization) (mechanical engineer) Manó Sándor (1977-) (gépészmérnök, számítógépes tervezőmérnök) Szabó János (1966-) (ortopéd sebész) Mankovits Tamás (1981-) (gépészmérnök) Csernátony Zoltán (1959-2023) (ortopéd sebész, traumatológus)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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