Minimum Lateral Bone Coverage Required for Securing Fixation of Cementless Acetabular Components in Hip Dysplasia

Objectives. To determine the minimum lateral bone coverage required for securing stable fixation of the porous-coated acetabular components (cups) in hip dysplasia. Methods. In total, 215 primary total hip arthroplasties in 199 patients were reviewed. The average follow-up period was 49 months (rang...

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Bibliographic Details
Published in:BioMed research international 2017-01, Vol.2017 (2017), p.1-7
Main Authors: Ito, Yoshihiro, Nakamura, Tetsuro, Nakashima, Yasuharu, Fujii, Masanori, Hara, Toshihiko
Format: Article
Language:English
Subjects:
Acetabulum - diagnostic imaging
Acetabulum - surgery
Aged
Aged, 80 and over
Arthritis
Arthroplasty, Replacement, Hip - methods
Care and treatment
Clinical Study
Dimensional analysis
Dysplasia
Female
Follow-Up Studies
Hip Dislocation - diagnostic imaging
Hip Dislocation - surgery
Hip joint
Hip Prosthesis
Hospitals
Humans
Joint surgery
Male
Middle Aged
Patients
Polyethylene
Porosity
Prosthesis Design
Reoperation
Statistics
Studies
Surgery
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Summary:Objectives. To determine the minimum lateral bone coverage required for securing stable fixation of the porous-coated acetabular components (cups) in hip dysplasia. Methods. In total, 215 primary total hip arthroplasties in 199 patients were reviewed. The average follow-up period was 49 months (range: 24–77 months). The lateral bone coverage of the cups was assessed by determining the cup center-edge (cup-CE) angle and the bone coverage index (BCI) from anteroposterior pelvic radiographs. Further, cup fixation was determined using the modified DeLee and Charnley classification system. Results. All cups were judged to show stable fixation by bone ingrowth. The cup-CE angle was less than 0° in 7 hips (3.3%) and the minimum cup-CE angle was −9.2° (BCI: 48.8%). Thin radiolucent lines were observed in 5 hips (2.3%), which were not associated with decreased lateral bone coverage. Loosening, osteolysis, dislocation, or revision was not observed in any of the cases during the follow-up period. Conclusion. A cup-CE angle greater than −10° (BCI > 50%) was acceptable for stable bony fixation of the cup. Considering possible errors in manual implantation, we recommend that the cup position be planned such that the cup-CE angle is greater than 0° (BCI > 60%).
ISSN:2314-6133
2314-6141
DOI:10.1155/2017/4937151