Determining and accurately restoring the flexion-extension
axis of the elbow is essential for functional recovery after total
elbow arthroplasty (TEA). We evaluated the effect of morphological
features of the elbow on variations of alignment of the components
at TEA. Morphological and
Aims. This study aims to: determine the difference in pelvic
Aims. The direct anterior approach (DAA) for total hip arthroplasty (THA) has potential advantages over other approaches and is most commonly performed with the patient in the supine
Aims. The aim of this study was to examine the implant accuracy of custom-made partial pelvis replacements (PPRs) in revision total hip arthroplasty (rTHA). Custom-made implants offer an option to achieve a reconstruction in cases with severe acetabular bone loss. By analyzing implant deviation in CT and radiograph imaging and correlating early clinical complications, we aimed to optimize the usage of custom-made implants. Methods. A consecutive series of 45 (2014 to 2019) PPRs for Paprosky III defects at rTHA were analyzed comparing the preoperative planning CT scans used to manufacture the implants with postoperative CT scans and radiographs. The anteversion (AV), inclination (IC), deviation from the preoperatively planned implant
Aims. The aim of this study was to assess and compare active rotation of the forearm in normal subjects after the application of a short-arm cast (SAC) in the semisupination
Aims. Guided growth has been used to treat coxa valga for cerebral palsy (CP) children. However, there has been no study on the optimal
Aims. The aim of this study was to explore why some calcar screws are malpositioned when a proximal humeral fracture is treated by internal fixation with a locking plate, and to identify risk factors for this phenomenon. Some suggestions can be made of ways to avoid this error. Methods. We retrospectively identified all proximal humeral fractures treated in our institution between October 2016 and October 2018 using the hospital information system. The patients’ medical and radiological data were collected, and we divided potential risk factors into two groups: preoperative factors and intraoperative factors. Preoperative factors included age, sex, height, weight, body mass index, proximal humeral bone mineral density, type of fracture, the condition of the medial hinge, and medial metaphyseal head extension. Intraoperative factors included the grade of surgeon, neck-shaft angle after reduction, humeral head height, restoration of medial support, and quality of reduction. Adjusted binary logistic regression and multivariate logistic regression models were used to identify pre- and intraoperative risk factors. Area under the curve (AUC) analysis was used to evaluate the discriminative ability of the multivariable model. Results. Data from 203 patients (63 males and 140 females) with a mean age of 62 years (22 to 89) were analyzed. In 49 fractures, the calcar screw was considered to be malpositioned; in 154 it was in the optimal
Aims. The primary aim of this study was to define and quantify three
new measurements to indicate the
Aims. Posterior tilt of the pelvis with sitting provides biological
acetabular opening. Our goal was to study the post-operative interaction
of skeletal mobility and sagittal acetabular component
Aims. The aims of this study were to measure sagittal standing and sitting lumbar-pelvic-femoral alignment in patients before and following total hip arthroplasty (THA), and to consider what preoperative factors may influence a change in postoperative pelvic
Most posterior hindfoot procedures have been
described with the patient
We studied the intra- and interobserver reliability of measurements of the
The aim of this cadaver study was to identify
the change in
Aims. The aim of this study was to evaluate the accuracy of implant placement when using robotic assistance during total hip arthroplasty (THA). Patients and Methods. A total of 20 patients underwent a planned THA using preoperative CT scans and robotic-assisted software. There were nine men and 11 women (n = 20 hips) with a mean age of 60.8 years (. sd. 6.0). Pelvic and femoral bone models were constructed by segmenting both preoperative and postoperative CT scan images. The preoperative anatomical landmarks using the robotic-assisted system were matched to the postoperative 3D reconstructions of the pelvis. Acetabular and femoral component
Aims. Open wedge high tibial osteotomy (OWHTO) for medial-compartment
osteoarthritis of the knee can be complicated by intra-operative
lateral hinge fracture (LHF). We aimed to establish the relationship
between hinge
The biomechanics of the patellofemoral joint can become disturbed during total knee replacement by alterations induced by the
Dislocation remains a major concern after total hip replacement, and is often attributed to malposition of the components. The optimum
Aims. The hypothesis of this study was that thigh circumference, distinct from body mass index (BMI), may be associated with the
The orientation of the acetabular component is
influenced not only by the orientation at which the surgeon implants
the component, but also the orientation of the pelvis at the time
of implantation. Hence, the orientation of the pelvis at set-up
and its movement during the operation, are important. During 67
hip replacements, using a validated photogrammetric technique, we
measured how three surgeons orientated the patient’s pelvis, how
much the pelvis moved during surgery, and what effect these had
on the final orientation of the acetabular component. Pelvic orientation
at set-up, varied widely (mean (± 2, standard deviation (. sd. ))):
tilt 8° (2. sd . ±32), obliquity –4° (2. sd . ±12), rotation
–8° (2. sd . ±14). Significant differences in pelvic positioning
were detected between surgeons (p <
0.001). The mean angular
movement of the pelvis between set-up and component implantation
was 9° (. sd. 6). Factors influencing pelvic movement included
surgeon, approach (posterior >
lateral), procedure (hip resurfacing
>
total hip replacement) and type of support (p <
0.001). Although,
on average, surgeons achieved their desired acetabular component
orientation, there was considerable variability (2. sd. ±16)
in component orientation. We conclude that inconsistency in positioning
the patient at set-up and movement of the pelvis during the operation account
for much of the variation in acetabular component orientation. Improved
methods of
We evaluated the accuracy with which a custom-made
acetabular component could be