There has been little clinical research to examine the effects of patient positioning and pelvic motion on alignment acetabular implant during total hip replacement surgery. Until now, no tools were capable accurately measuring these variables actual procedure. As part a broader program in medical robotics computer assisted surgery, system developed that includes several enabling technologies. The navigation (HipNav) continuously precisely measures location tracks relative intraoperatively....

The introduction of image guided systems in total hip replacement surgery provides the ability to plan precisely alignment acetabular cup before surgery, and perform according preoperative plan. Preoperative planners (interactive computer programs for surgical planning) based on three-dimensional medical images allow planning optimal placement implant components simulated performance. Exact measurement position during allows precise accurate final relative pelvis. This is used evaluate...

We prospectively obtained preoperative and 3-month postoperative lateral pelvic radiographs in the standing sitting positions from 84 patients who underwent total hip arthroplasty. measured orientation (flexion extension) using anterior plane as defined by superior iliac spines pubic tubercles references. There was a trend towards upright alignment when standing, with mean angle of 1.2 degrees (range, -22 - +27 degrees). In position pelvis tended to extend posteriorly, -36.2 -64 +4 wide...

Technologies are emerging that will influence the way in which orthopaedic surgery is planned, simulated, and performed. Recent advances fields of medical imaging, computer vision, robotics have provided enabling technologies to permit aided become an established area can address clinical needs. Although these been applied industry for more than 20 years, field assisted still its infancy. Image guided surgical navigation systems, robotic assistive devices, simulators begun emerge from...

Three-dimensional surface models of the normal hemipelvis derived from volumetric CT data on 42 patients were used to determine radius, depth and orientation native acetabulum. A sphere fitted lunate a plane matched acetabular rim calculate anatomical For 22 females mean abduction, anteversion, radius normalised 57.1 degrees (50.7 66.8 ), 24.1 (14.0 33.3 25 mm (21.7 30.3) 0.79 (0.56 1.04), respectively. The same parameters for 20 males 55.5 (47.7 65.9 19.3 (8.5 32.3 26.7 (24.5 28.7) 0.85...

The purpose of this randomized, prospective study was to compare accuracy in runnel placement as performed with a traditional arthroscopic anterior cruciate ligament (ACL) reconstruction technique and KneeNav™ ACL, computer-assisted surgical navigation technique. Two surgeons experienced ACL reconstruction, but inexperienced technique, each randomly used guides or drill tunnel twenty identical foam knees. Placement the resulting tibial femoral tunnels measured digitizing method compared...

The purpose of this randomized, prospective study was to compare accuracy in runnel placement as performed with a traditional arthroscopic anterior cruciate ligament (ACL) reconstruction technique and KneeNav™ ACL, computer-assisted surgical navigation technique. Two surgeons experienced ACL reconstruction, but inexperienced technique, each randomly used guides or drill tunnel twenty identical foam knees. Placement the resulting tibial femoral tunnels measured digitizing method compared...

Objective: To allow non-invasive registration of the bone surface for computer-assisted surgery (CAS), this investigation reports development and evaluation intraoperative using 2D ultrasound (US) images. This approach employs automatic segmentation reflection from US images tagged with 3D position to enable application CAS minimally invasive procedures.Methods: The US-based method was evaluated in comparison point-based registration, which is predominant current clinical use. absolute...

Almost all computer-assisted orthopaedic surgery systems that rely on the anterior pelvic plane definition, such as in computed tomography and magnetic resonance image-based, fluoroscopy-based, nonimage total hip replacement approaches, are derived from identifying two pairs of bony landmarks: superior iliac spines pubic tubercles. Although these strive to achieve cup alignment accuracy approximately 1 degree, even a minor failure correctly identify anatomic landmarks can lead higher...

A report on a new active, miniature bone-attached, robotic system including its design, high level and low control, is given together with description of the implementation first experimental use. The capable preparing bone cavity for an implant during joint arthroplasty procedures. Without loss generality, describes Patellofemoral Joint Replacement procedure. image-free all planning performed intra-operatively in robot coordinate system, eliminating need external tracking systems operating...

Surgical navigation has been shown to improve the accuracy of bone preparation and limb alignment in total knee arthroplasty (TKA). Previous work effectiveness various types systems. Here, for first time, we assessed a novel imageless semiautonomous handheld robotic sculpting system performing resection TKA using cadaveric specimens. In this study, compared planned final implant placement 18 specimens undergoing new tool. Eight surgeons carried out procedures three designs. A quantitative...

This study presents a clinical validation of postoperative measurements acetabular cup alignment following total hip arthroplasty (THA). The methodology was based on concurrent anatomic three-dimensional (3D) both the and pelvic orientation, using an original CT/X-ray matching algorithm named Xalign. subjects were 19 patients who had undergone bilateral THA CT-based surgical navigation. All CT scans multiple antero-posterior (AP) X-rays. Using proprietary software algorithm, X-rays included...

Instability is one of the most challenging complications total hip arthroplasty. The cause instability not always clear and treatment outcome satisfactory. Treatment can be optimized by accurate identification precise surgical technique. In this case report, we illustrate use a three-dimensional (3-D) preoperative planner virtual radiographic system to improve component position in revision arthroplasty required because recurrent dislocation. Using technique, identified common problems seen...

There is a need to develop and validate method for establishing cup orientation that patient specific independent of the anterior pelvic plane. It our hypothesis transverse acetabular ligament labrum can be used do this. The objective this study define plane formed by examine whether these local landmarks lie within limits acceptance positioning.Twenty-five consecutive patients, who were being investigated labral tears with MRI arthrogram hip, enrolled in prospective study. ligament-labrum...

Background There is a need to develop and validate method for establishing cup orientation that patient specific independent of the anterior pelvic plane. It our hypothesis transverse acetabular ligament labrum can be used do this. The objective this study define plane formed by examine whether these local landmarks lie within limits acceptance positioning. Methods Twenty-five consecutive patients, who were being investigated labral tears with MRI arthrogram hip, enrolled in prospective...