ABSTRACT
We evaluated 100 limbs in 50 patients who had undergone unilateral primary total hip arthroplasty with a normal contralateral hip. The 50 patients were divided into 2 groups by postoperative acetabular cup position, specifically by inferior and superior placement (inferior and superior groups). Hip abductor muscle strength was evaluated qualitatively by the modified Trendelenburg test and quantitatively by handheld dynamometer. The ratio of normalized strength of the reconstruction side to that of the nonoperated side was calculated (strength ratio). The modified Trendelenburg test was positive in 5 of 23 patients in the inferior group and 11 of 27 in the superior group (P < .05). The strength ratio of the superior group was decreased by 7.7% in comparison with that of the inferior group (P < .01).
Subject(s)
Arthroplasty, Replacement, Hip/methods , Hip Joint/surgery , Muscle Strength/physiology , Muscle, Skeletal/physiology , Prosthesis Fitting/methods , Adult , Aged , Female , Hip Joint/diagnostic imaging , Humans , Linear Models , Male , Middle Aged , Muscle Strength Dynamometer , Osteoarthritis, Hip/surgery , Prosthesis Failure , Radiography , Retrospective Studies , Treatment OutcomeABSTRACT
Twenty patients who underwent total hip arthroplasty were randomly allocated to have surgery through a mini incision of < or = 8 cm (mini-incision surgery [MIS] group, n = 10) or a standard incision of 14 cm (standard group, n = 10). A laser Doppler flowmeter was used to measure the intraoperative blood flow of the skin. The measurements were performed at 2 regions, specifically, anterior and posterior regions across the middle points of skin incision. The measurements were taken before making the incision and after implantation. As a control, the skin blood flow over the anterior superior iliac spine was measured. After implantation, mean skin blood flows at both regions in the MIS group were significantly decreased by 32% and 33%. However, the corresponding flows in standard group and control regions were constant during operation.
Subject(s)
Arthroplasty, Replacement, Hip/methods , Osteoarthritis, Hip/surgery , Skin/blood supply , Aged , Aged, 80 and over , Female , Hip/physiology , Humans , Laser-Doppler Flowmetry , Male , Middle Aged , Minimally Invasive Surgical Procedures , Osteoarthritis, Hip/physiopathology , Regional Blood FlowABSTRACT
Total hip arthroplasty was performed in 19 patients using the lateral approach. Laser Doppler flowmetry was used to measure the blood flow in the anterior and posterior parts of the gluteus medius. The anterior part was split and detached. The posterior part was left intact. The blood flow in the gluteus medius of the anterior part was decreased by 15.4%, while that of the posterior part remained constant during surgery. Postoperatively, the Trendelenburg sign remained positive in 3 of 16 patients. No correlations were observed between a positive Trendelenburg sign and reduction in blood flow of the gluteus medius.
