The short, tapered, collarless Furlong Active stem has been recently associated in the published literature with significant subsidence using Roentgen stereophotogrammetric analysis.
The purpose of this study was to analyze the short-term radiographic subsidence in Furlong Active HAP stems and correlate the results with the age, gender, bone morphology, and bone quality of the proximal femur, stem diameter, and medullary canal filling.
Sixty-five consecutive patients (70 hips) receiving the Furlong Active HAP stems were enrolled in this prospective series. The average follow-up was 2.99 ± 1.38 years. All patients were evaluated clinically using the Harris Hip Score (HHS) and radiographically for femoral stem subsidence. In addition, proximal femoral osteopenia, proximal femur morphology, and medullary canal filling were also evaluated.
The average subsidence was 2.4 mm (from 0 to 13 mm) at the end of the follow-up period. The average HHS score at the end of follow-up was 90 (range, 81–98). There was one intraoperative fracture.
Of the Furlong Active stems 61% subsided with initial weight bearing. Subsidence is higher in males, but no correlation has been found with age, stem diameter, morphology, osteopenia, or canal filling.
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Conflict of Interest:
José Cordero-Ampuero, MD, PhD received travel support for meetings from MBA for the study; is a paid consultant for Pfizer, receives payment for presentation from MSD and Pfizer and travel support from MBA, Sanofi and Stryker, outside the work. Pablo Peñalver, MD, received travel support for meetings for the study from MBA; receives travel support from Sanofi, Rovi, Pfizer, and MBA, outside the work. Rodrigo Antón, MD received travel support for the study from MBA, Sanofi, and Rovi; received travel support from Sanofi and Rovi, outside the work. María Galán, MD, received travel support for meetings for the study from MBA; received travel support from MSD, Pfizer, Sanofi, and Rovi, outside the work. Enrique Cordero declared that he has no conflict of interest.
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008 (5).
Informed consent was obtained from all patients included in the study.
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Level of Evidence: Therapeutic Study, Level IV (Case Series, No Control Group)
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Cordero-Ampuero, J., Peñalver, P., Antón, R. et al. Radiographic Subsidence in Asymptomatic Patients After THR Using the Furlong Active HAP Stem. HSS Jrnl 9, 161–165 (2013). https://doi.org/10.1007/s11420-013-9342-z
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