The aim of this study was to reveal the influence of preoperative Hb on quadriceps strength after TKA.
A total of 46 knees of 31 patients who underwent TKA between October 2023 to September 2024 (unilateral TKA: 16 patients, simultaneous bilateral TKA: 15 patients, age: 74.3±10.4, height: 151.3±9.3, weight: 60.2±12.1, 23 females) were participated in this study. All patients received standard physical therapy before and after TKA surgery. The preoperative Hb was obtained from a routine blood examination before surgery. The quadriceps strength was measured using a hand-held dynamometer with the hip and knee at 90°flexion at preoperatively and 3 weeks after TKA surgery. To reveal the relationship between the preoperative Hb and the postoperative quadriceps strength, a multiple regression analysis was performed, with the postoperative quadriceps strength as the dependent variable and age, sex, body mass index, unilateral or simultaneous bilateral, the preoperative quadriceps strength, and the preoperative Hb as the independent variables. Statistical significance was set at P 0.05.
Multiple regression analysis revealed that the preoperative quadriceps strength (β= 0.671, p 0.01) and the preoperative Hb (β= 0.273, p = 0.028) were significant factors for the postoperative quadriceps strength.
The postoperative quadriceps strength is associated with postoperative walking and stair performance and patients satisfaction. The results of this study suggested that the preoperative Hb was associated with postoperative quadriceps strength independently of the preoperative strength, regardless of whether unilateral or simultaneous bilateral TKA.
Higher preoperative Hb may lead to stronger postoperative quadriceps strength. This suggests that preoperative nutritional guidance is important, and it is also important to develop a patient program based on preoperative blood data.
hemoglobin
total knee arthroplasty
