Abstract:
BACKGROUND:Early femoral stem subsidence following a cementless THA is correlated with aseptic loosening of the femoral component. The short femoral stems allow bone sparing and implantation through a minimally invasive approach; however, due to their metaphyseal anchoring, they might demonstrate different subsidence pattern than the conventional stems. METHODS:In this prospective single-center study, a total of 68 consecutive patients with an average age of 63 years, and a minimum follow-up of 5 years following a cementless THA with a metaphyseal-anchored short femoral stem were included. The femoral stem subsidence was evaluated using "Ein Bild Roentgen Analyse" (EBRA). RESULTS:Average stem migration was 0.96 +/- 0.76 mm at 3 months, 1.71 +/- 1.26 mm at 24 months, and 2.04+/- 1.42 mm at last follow-up 60 months postoperative. The only factor that affected migration was a stem size of 6 or more (r2 = 5.74; p = 0.039). Subdivision analysis revealed, that only in females migration appeared to be affected by stem size irrespective of weight but not in men (female stem size of 6 or more vs. less (Difference = - 1.48 mm, R2 = 37.5; p = 0.001). Migration did not have an impact on clinical outcome measures. CONCLUSIONS:The examined metaphyseal-anchored short femoral stem showed the highest subsidence within the first 3 months postoperative, the implant began to stabilize at about 24 months but continued to slowly migrate with average total subsidence of 2.04 mm at 5 years following the THA. The amount of stem subsidence was not associated with worse clinical outcomes such as HHS, patient satisfaction, or pain.
journal_name
BMC Musculoskelet Disordjournal_title
BMC musculoskeletal disordersauthors
Schaer MO,Finsterwald M,Holweg I,Dimitriou D,Antoniadis A,Helmy Ndoi
10.1186/s12891-019-2980-7subject
Has Abstractpub_date
2019-12-12 00:00:00pages
604issue
1issn
1471-2474pii
10.1186/s12891-019-2980-7journal_volume
20pub_type
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