title: Early failure of a non-cemented femoral stem after minimal-invasive total hip arthroplasty: cause analysis and classification.
abstract: 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 >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 <1 year postoperatively, late failure >1 year postoperatively. A classification of stem failure differentiating time and cause is suggested as this seems to be missing in the literature.
authors.affiliation: Department of Trauma Surgery, University of Basel, Spitalstr. 21, 4031, Basel, Switzerland, jbenthien@uhbs.ch.
authors.forename: Jan P
authors.initials: JP
authors.lastname: Benthien
authors.forename: Wolf
authors.initials: W
authors.lastname: Siepen
mesh_terms: D000368:Aged; D019644:Arthroplasty, Replacement, Hip; D001835:Body Weight; D020878:Device Removal; D005260:Female; D006622:Hip Prosthesis / Q000009:adverse effects*; D006801:Humans; D008855:Microscopy, Electron, Scanning; D019060:Minimally Invasive Surgical Procedures; D009765:Obesity / Q000150:complications; D015207:Osteoarthritis, Hip / Q000150:complications / Q000601:surgery; D011474:Prosthesis Design; D011475:Prosthesis Failure / Q000209:etiology*; D012086:Reoperation; D013314:Stress, Mechanical; D016474:Weight-Bearing