Assessment of early biological fixation of cementless tapere
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The aim of the study was to compare radiographic and digital tomosynthesis assessments of early biological fixation of a cementless stem in primary total hip arthroplasty (THA), as well as to look into the factors that influence early biological fixation.

73 patients underwent THA using cementless short tapered-wedge stems. Both radiography and digital tomosynthesis were performed at 6 weeks and 3, 6, 12, and 24 months after surgery. The presence of spot welds (SW) was evaluated at each postoperative period to assess biological fixation between the stem and the femur. The area of contact between the femur and the stem was divided into seven zones based on Gruen’s zone classification.

Results:
--All 73 patients had no SW 6 weeks after surgery on radiography and digital tomosynthesis.

--3 months postoperatively, there was no SW on radiography; however, digital tomosynthesis revealed SW in 31 patients.

--6 months postoperatively, radiography showed 22 SW in 18 patients and digital tomosynthesis showed 94 SW in 48 patients.

Finally, digital tomosynthesis detected biological fixation between the stem and the femur earlier than radiography; biological fixation can occur 3 months after surgery.

Source: https://www.sciencedirect.com/science/article/abs/pii/S0883540321003831?dgcid=rss_sd_all
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