Modular Neck vs Nonmodular Femoral Stems in Complete Hip Arthroplasty-Scientific End result, Steel Ion Ranges, and Radiologic Findings.
J Arthroplasty. 2017 Sep;32(9):2774-2778
Authors: Mikkelsen RT, Fløjstrup M, Lund C, Kjærsgaard-Andersen P, Skjødt T, Varnum C
BACKGROUND: Modular neck femoral stem (MNFS) for whole hip arthroplasty (THA) was launched to optimize the end result, however created issues about ache, elevated blood steel ion ranges, and adversarial response to steel particles reminiscent of pseudotumors (PTs), associated to corrosion between femoral neck and stem. We in contrast these outcomes in sufferers with MNFS or nonmodular femoral stem (NFS) THA.
METHODS: Thirty-three sufferers with unilateral MNFS THA have been in contrast with 30 sufferers with unilateral NFS THA. Ranges of ache, serum cobalt, serum chromium have been decided. Magnetic resonance imaging was carried out to explain PT and fatty atrophy of muscle tissues.
RESULTS: The MNFS and NFS group had a imply follow-up of two.three and three.1 years, respectively. 4 and 13 sufferers within the MNFS and NFS group had ache, respectively (P = .005). The MNFS group had greater ranges of serum cobalt (P < .0001) and chromium (P = .006). PTs have been current in each the MNFS (n = 15) and NFS (n = 7) teams (P = .066). PTs have been associated to serum cobalt (P = .04) however to not ache or serum chromium. Fatty atrophy prevalence within the piriformis and gluteal muscle tissues have been greater in sufferers with MNFS (P = .009 and P = .032, respectively).
CONCLUSION: Extra sufferers within the NFS group had ache. Serum cobalt and chromium ranges have been greater within the MNFS group. Prevalence of PTs was twice as excessive within the MNFS group, however the distinction was insignificant.
PMID: 28457759 [PubMed – indexed for MEDLINE]