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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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001-es BibID:	BIBFORM111069
035-os BibID:	(scopus)85065804715 (wos)000466619700001
Első szerző:	Zhang, Lei (orvos)
Cím:	Acetabular Cup Positioning during Total Hip Replacement in Osteoarthritis Secondary to Developmental Dysplasia of the Hip : a Review of the Literature / Lei Zhang, Xiaosheng Lu
Dátum:	2019
ISSN:	0001-5415
Megjegyzések:	Various surgical treatments for osteoarthritis (OA) secondary to hip dysplasia have been reported in the literature. According to the position of the arthroplasty cup, generally they could be divided into two groups: the primary rotational center (PRC) group and the high hip center (HHC) group. Some surgeons prefer the HHC technique. Without doubt it is less demanding, but several concerns exist against the long-term stability. When restoring the PRC, since the dysplastic acetabulum is usually shallower and underdeveloped, bone grafts or other biosynthetic materials are usually needed for the ideal fixation. The source of grafts is quite wide. For example, they could be autologous (femoral head, iliac crest) or homologous (allografts), bulky or morselized. Medial wall protrusion technique, as well as other materials like oblong cup, porous titanium and tantalum augments, 3D printed implants could also be an option. Except these, reports are also divided into cemented and cementless techniques. Therefore, no technique is perfect and clinical results so far are quite variable. We think it's necessary to compare the pros and cons between each other.
Tárgyszavak:	Orvostudományok Klinikai orvostudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca. - 86 : 2 (2019), p. 93-100. -
További szerzők:	Lu, Xiaosheng
Internet cím:	Szerző által megadott URL Intézményi repozitóriumban (DEA) tárolt változat
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