Quality of life and functional outcome of periprosthetic fractures around the knee following knee arthroplasty.

PURPOSE OF THE STUDY The present study aimed to analyse both, the functional outcome and quality of life after surgical treatment of periprosthetic fractures following TKA. MATERIAL AND METHODS A retrospective review of all periprosthetic fractures following knee arthroplasty which have been surgically treated at our institution between January 2005 and January 2012 was conducted. Beside epidemiologic data, type of surgery and postoperative complications were recorded. The functional outcome was assessed using range of motion, Knee Society Score and VAS to evaluate pain. Quality of life was evaluated using SF-36 and WOMAC. Furthermore patients mobility and comorbidities were analysed. RESULTS 25 (mean age 76 ± 8 years; m:w 5:20) patients were included. The overall complication rate was 24%. Mean KSS knee score was 73 ± 19 and a function score was 41 ± 36. Range of motion revealed 95° ± 24° (active) and 98° ± 16° (passive). The total SF-36 scored a mean of 41 ± 6 and 29 ± 19 in average considering the WOMAC index (pain: 19 ± 20; stiffness: 23 ± 27; daily: 47 ± 29). 20% were able to mobilise without help as opposed to 80% that were in need for assistance. Our analysis revealed no influence of the final outcome as a function of fracture type or type of treatment. Multiple regression analysis could not reveal significant influence of the comorbidities. CONCLUSION Periprosthetic fractures following knee arthroplasty are accompanied by a significant decrease of the knee function and quality of life as well as high complication rates. Since patient's quality of life apparently depends on the functional outcome, future efforts should aim to improve these parameters. Key words: periprosthetic fracture, total knee arthroplasty, quality of life, functional outcome, locking plate.