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In this paper, we present a 77-year-old female patient with an early failure of a non-cemented femoral stem 6 months after implantation. We evaluate possible reasons for the implant failure in our case against the literature. Risk factors for stem failure include a BMI &gt;30, varus implantation, a high femoral canal cortex ratio, and a small implant. It should be distinguished between modular and non-modular stems as well as cemented and non-cemented. Early failure would be &lt;1 year postoperatively, late failure &gt;1 year postoperatively. A classification of stem failure differentiating time and cause is suggested as this seems to be missing in the literature.

Early failure of a non-cemented femoral stem after minimal-invasive total hip arthroplasty: cause analysis and classification