Abstract
PurposeTo study the impact of acetabular reaming depth on reconstruction of rotation center (RC) in unilateral primary total hip arthroplasty (UPTHA) and guide individualized preoperative design.Methods200 postoperative standard bilateral hip anteroposterior radiographs after UPTHA were included, which were collected from January, 2013 to June, 2017 in our hospital. Osteonecrosis of femoral head was the only diagnosis in this cohort. The parameters were measured on the anteropoterior radiographs by using RadiAnt DICOM viewer.ResultsThe average of the thickness of the teardrop is about 6.13 ± 1.42 mm. The parameter a (the difference value of the distance of bilateral RC and midline) was positively correlated with the parameter e (the acetabular reaming depth), and the Pearson correlation coefficient was 0.49 when P = 0.05. Furthermore, the value of parameter (e) was 8.25 mm when a2 (the distance from the center of the prosthesis femoral head to the vertical line across the midpoint of pubic symphysis) equaled a1 (the distance from RC of the healthy femoral head to the vertical line across the midpoint of pubic symphysis).ConclusionsThe reaming depth of the acetabulum could influence the reconstruction of RC during UPTHA. When the medial margin of the cup was placed about 2 mm to the lateral border of the ipsilateral teardrop (the bottom of the ovum), the rotation center would be accurately restored.
Highlights
It is acknowledged that total hip arthroplasty (THA) is one of the most successful procedures in the field of orthopeadics, which is widely applied to the treatment of many hip joint diseases resulted in dysfunction of hip joint [1]
Standard bilateral hip anteroposterior radiographs after unilateral primary THA (UPTHA) were used to clarify the accurate acetabular reaming depth for anatomically reconstructing rotation center (RC) of hip joint during THA
General information In this study, 200 standard bilateral hip anteroposterior radiographs after UPTHA were collected from January 2013 to June 2017 in our hospital
Summary
It is acknowledged that total hip arthroplasty (THA) is one of the most successful procedures in the field of orthopeadics, which is widely applied to the treatment of many hip joint diseases resulted in dysfunction of hip joint [1]. Maximization of the prosthesis life is the most significant issue for orthopedic surgeons [2]. Among the influencing factors for successful restoration of joint, accurate biomechanical reconstruction of the femur and acetabulum is essential for satisfactory function achievement [3,4,5]. Over time it will cause the muscles to lose their original function, the joints are unstable, and eventually the loosening of the prosthesis. The depth of acetabular prosthesis implantation becomes a main factor infecting the position of RC. Despite advances in surgery technique, the landmark of acetabular reaming depth for anatomic restoration of RC remains uncertain. Standard bilateral hip anteroposterior radiographs after unilateral primary THA (UPTHA) were used to clarify the accurate acetabular reaming depth for anatomically reconstructing RC of hip joint during THA
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