Several short femoral stems have been introduced in primary total hip arthroplasty, supposedly in order to save proximal bone stock. We intended to analyse primary stability, changes in periprosthetic bone mineral density (BMD), and clinical outcome after insertion of the uncemented collum femoris preserving (CFP)-femoral device. A prospective cohort study on 30 patients scheduled for receiving the CFP-stem combined with an uncemented cup was carried out. Stem migration was analysed by radiostereometry (RSA). Preoperative total hip BMD and postoperative periprosthetic BMD in Gruen zones 1–7 was investigated by DXA, and the Harris hips score (HHS) was determined. The patients were followed up to 12 months.Introduction
Methods
Stiffness of the knee after total knee arthroplasty (TKA) impairs knee function and reduces patient satisfaction. Limited preoperative range of motion (ROM) and a diagnosis of osteoarthritis seem to be associated with postoperative stiffness, and medical comorbidities such as diabetes mellitus have been discussed as predisposing factors. The present study was undertaken in order to analyse both patient-related and surgical factors that could be associated with the need for mobilization under anaesthesia (MUA) after TKA. We designed a case-control-study and extracted the study population from our local arthroplasty register. We identified all patients in our register that required MUA following primary TKA (n=35) and then randomly selected 4 control patients for each case of MUA. Incomplete medical records resulted in the exclusion of 18 patients, leaving 157 patients. Univariate analysis was used in order to investigate differences between the two groups with respect to demographics, pre- and postoperative ROM, medical or psychiatric comorbidities, and the type of implant. Variables with a proposed influence on outcome were entered into a binary logistic regression model, and risk ratios (RR) were calculated with 95% confidence intervals (CI).Introduction
Methods
