Hip Functions in Patients with Rotating Hinge Knee Arthroplasty

Abstract Background Rotating hinged knee prosthesis is frequently used for certain indications. The indications and results for rotating hinge knee prosthesis in primary and revision arthroplasty are controversial. The aim of this study was to investigate the effects on hip function following rotating hinged knee arthroplasty surgery and to compare outcome of primer and revision rotating hinged knee arthroplasty.Methods 46 patients underwent rotating hinged knee prosthesis by a single surgeon; including 21 primary arthroplasty and 38 revision, 59 knees arthroplasty were included. Hospital for Special Surgery (HSS) knee scores, SF-12 quality of life scale, joint range of motion, VAS score, Harris hip scores (HHS) were evaluated before and after surgery.Results A statistically significant increase was found in both hip joint HHS scores in patients with rotating hinged knee replacement. A statistically significant improvement was found in HSS scores, knee joint VAS in patients with rotating hinged knee replacement (p < 0.05). Hip osteoarthritis stage did not progress statistically compared to preoperative values following rotating hinged knee arthroplasty. The hip functions of ipsilateral and contralateral sides improved in terms of limping, assistive device, walking distance, and wearing socks and shoes. A moderate positive correlation was found between knee scores and hip scores.Conclusion A successful knee arthroplasty surgery in patients with advanced biomechanical problems contributes to the improvement in hip function by improving the biomechanics and functions of the knee joint. It is necessary to evaluate all joints and bone structures in both lower extremities to make better preoperative planning.