1. Does cup position differ between trabecular metal and titanium cups? A radiographic propensity score matched study of 300 hips.
- Author
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Laaksonen I, Hjelmberg N, Gromov K, Eskelinen AE, Rolfson O, Malchau H, Troelsen A, Mäkelä KT, and Mohaddes M
- Subjects
- Equipment Failure Analysis, Female, Finland epidemiology, Humans, Image Processing, Computer-Assisted, Male, Middle Aged, Prosthesis Failure etiology, Prosthesis Fitting methods, Radiography methods, Sweden epidemiology, Arthroplasty, Replacement, Hip adverse effects, Arthroplasty, Replacement, Hip instrumentation, Arthroplasty, Replacement, Hip methods, Bone Anteversion diagnostic imaging, Bone Anteversion etiology, Bone Anteversion prevention & control, Hip Prosthesis adverse effects, Metals therapeutic use, Postoperative Complications diagnosis, Postoperative Complications etiology, Postoperative Complications prevention & control, Prosthesis Design adverse effects, Prosthesis Design methods, Titanium therapeutic use
- Abstract
Background and purpose - The use of trabecular metal cups in primary total hip arthroplasty (THA) is increasing, despite the survival of Continuum cups being slightly inferior compared with other uncemented cups in registries. This difference is mainly explained by a higher rate of dislocation revisions. Cup malpositioning is a risk factor for dislocation and, being made of a highly porous material, Continuum cups might be more difficult to position. We evaluated whether Continuum cups had worse cup positioning compared with other uncemented cups. Patients and methods - Based on power calculation, 150 Continuum cups from 1 center were propensity score matched with 150 other uncemented cups from 4 centers. All patients had an uncemented stem, femoral head size of 32 mm or 36 mm, and BMI between 19 and 35. All operations were done for primary osteoarthrosis through a posterior approach. Patients were matched using age, sex, and BMI. Cup positioning was measured from anteroposterior pelvic radiograph using the Martell Hip Analysis Suite software. Results - There was no clinically relevant difference in mean inclination angle between the study group and the control group (43° [95% CI 41-44] and 43° [CI 42-45], respectively). The study group had a larger mean anteversion angle compared with the control group, 19° (CI 18-20) and 17° (CI 15-18) respectively. Interpretation - Continuum cups had a greater anteversion compared with the other uncemented cups. However, the median anteversion was acceptable in both groups and this difference does not explain the larger dislocation rate in the Continuum cups observed in earlier studies.
- Published
- 2020
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