Preoperative factors predicting the severity of BMD loss around the implant after Total hip Arthroplasty

Abstract Background Stress shielding after total hip arthroplasty (THA) leads to loss of bone mineral density (BMD) around the femoral implants, particularly in proximal area. Loss BMD implant is likely occur within 1 year THA; however, its severity depends on patient characteristics. This study evaluated preoperative factors correlated with zone 7 THA. Methods retrospective cohort included 48 patients who underwent primary THA from October 2011 December 2015. All implantation a Zweymüller-type component without any postoperative osteoporosis medications. The objective variable was change year. Factors age, body mass index, Japanese Orthopaedic Association score, Harris Hip Score, Canal Flare Index (CFI), and lumbar frontal lateral sides. Univariate multivariate regression analyses identified BMD. Results analysis CFI ( P = 0.003) anterior-posterior < 0.001) sides as being Multivariate 0.014) side independently Conclusion Lower lower were Patients these characteristics should be monitored carefully for severe