The biomechanical analysis of three plating fixation systems for periprosthetic femoral fracture near the tip of a total hip arthroplasty

<p>Abstract</p> <p>Background</p> <p>A variety of techniques are available for fixation of femoral shaft fractures following total hip arthroplasty. The optimal surgical repair method still remains a point of controversy in the literature. However, few studies have quantified the performance of such repair constructs. This study biomechanically examined 3 different screw-plate and cable-plate systems for fixation of periprosthetic femoral fractures near the tip of a total hip arthroplasty.</p> <p>Methods</p> <p>Twelve pairs of human cadaveric femurs were utilized. Each left femur was prepared for the cemented insertion of the femoral component of a total hip implant. Femoral fractures were created in the femurs and subsequently repaired with Construct A (Zimmer Cable Ready System), Construct B (AO Cable-Plate System), or Construct C (Dall-Miles Cable Grip System). Right femora served as matched intact controls. Axial, torsional, and four-point bending tests were performed to obtain stiffness values.</p> <p>Results</p> <p>All repair systems showed 3.08 to 5.33 times greater axial stiffness over intact control specimens. Four-point normalized bending (0.69 to 0.85) and normalized torsional (0.55 to 0.69) stiffnesses were lower than intact controls for most comparisons. Screw-plates provided either greater or equal stiffness compared to cable-plates in almost all cases. There were no statistical differences between plating systems A, B, or C when compared to each other (p > 0.05).</p> <p>Conclusions</p> <p>Screw-plate systems provide more optimal mechanical stability than cable-plate systems for periprosthetic femur fractures near the tip of a total hip arthroplasty.</p

Factors Associated with Revision Surgery after Internal Fixation of Hip Fractures

Background: Femoral neck fractures are associated with high rates of revision surgery after management with internal fixation. Using data from the Fixation using Alternative Implants for the Treatment of Hip fractures (FAITH) trial evaluating methods of internal fixation in patients with femoral neck fractures, we investigated associations between baseline and surgical factors and the need for revision surgery to promote healing, relieve pain, treat infection or improve function over 24 months postsurgery. Additionally, we investigated factors associated with (1) hardware removal and (2) implant exchange from cancellous screws (CS) or sliding hip screw (SHS) to total hip arthroplasty, hemiarthroplasty, or another internal fixation device. Methods: We identified 15 potential factors a priori that may be associated with revision surgery, 7 with hardware removal, and 14 with implant exchange. We used multivariable Cox proportional hazards analyses in our investigation. Results: Factors associated with increased risk of revision surgery included: female sex, [hazard ratio (HR) 1.79, 95% confidence interval (CI) 1.25-2.50; P = 0.001], higher body mass index (fo

Surgical fellowship training in Canada: What is its current status and is improvement required?

This paper examines current issues concerning surgical fellowship training in Canada. Other than information from a few studies of fellowship training in North America, there are scant data on this subject in the literature. Little is known about the demographic characteristics of those who pursue fellowship training in Canada, what the experiences and expectations are of fellows and their supervisors with respect to the strengths and weaknesses of this level of training, or how this level of education fits in with Canadian undergraduate and postgraduate medical training. We summarize current knowledge about fellowship training in Canada as it pertains to demographic characteristics, finances, work hours, residency training, preparation for clinical and research work and satisfaction with training. Most information on surgical fellowship training comes from the United States. As such, we used information from American studies to supplement the Canadian data. Because a surgical fellowship experience in Canada may be different from that in the United States, we propose that Canadian surgical fellows and their supervisors should be surveyed to gain an understanding of such information. This knowledge could be used to improve surgical fellowship training in Canada

Management of persistent postpartum pelvic pain

Persistent postpartum pelvic pain is an uncommon but disabling disorder. Although symptoms resolve spontaneously in the majority of cases, some carefully selected women with this chronic condition might benefit from surgical stabilization of the pelvic ring. We retrospectively studied 19 patients whose persistent postpartum pelvic pain was treated at our center. Although most patients were successfully treated nonoperatively, 6 (31.5%) underwent surgery because of symptoms persisting more than 1 year. Imaging studies, including magnetic resonance imaging, were used to assess the extent and the nature of the lesion before surgery. Eleven patients had degenerative changes in the anterior pelvic ring; the other 8 patients had degenerative sacroiliac joint changes. Surgical procedures included resection of the diseased fragment, anterior symphyseal plating, and bone grafting with and without posterior ring stabilization. For all patients, mean Majeed outcome score was 85 (range, 46-100). No significant difference in outcomes was found between the surgically treated patients and the nonoperatively treated patient

Training femoral neck screw insertion skills to surgical trainees: computer-assisted surgery versus conventional fluoroscopic technique

BACKGROUND: Femoral neck fractures are among the most common orthopaedic injuries impacting the health care system. Surgical management of such fractures with cannulated screws is a commonly performed procedure. The acquisition of surgical skills necessary to perform this procedure typically involves learning on real patients with fluoroscopic guidance. This study attempts to determine if a novel computer-navigated training model improves the learning of this basic surgical skill. METHODS A multicenter, prospective, randomized, and controlled study was conducted using surgical trainees with no prior experience in surgically managing femoral neck fractures. After a training session, participants underwent a pretest by performing the surgical task (screw placement) on a simulated hip fracture using fluoroscopic guidance. Immediately after, participants were randomized into either undergoing a training session using conventional fluoroscopy or computer-based navigation. Immediate posttest, retention (4 weeks later), and transfer tests were performed. Performance during the tests was determined by radiographic analysis of hardware placement. RESULTS Screw placement by trainees was ultimately equal to the level of an expert surgeon with either training technique. Participants who trained with computer navigation took fewer attempts to position hardware and used less fluoroscopy time than those trained with fluoroscopy. When those trained with fluoroscopy used computer navigation at the transfer test, less fluoroscopy time and dosage was used. The concurrent augmented feedback provided by computer navigation did not affect the learning of this basic surgical skill in surgical novices. No compromise in learning occurred if the surgical novice trained with one type of technology and transferred to using the other. CONCLUSIONS The findings of this study suggest that computer navigation may be safely used to train surgical novices in a basic procedure. This model avoids using both live patients and harmful radiation without a compromise in the acquisition of a 3-dimensional technical skill

Overarching challenges to the implementation of competency-based medical education

Medical education is under increasing pressure to more effectively prepare physicians to meet the needs of patients and populations. With its emphasis on individual, programmatic, and institutional outcomes, competency-based medical education (CBME) has the potential to realign medical education with this societal expectation. Implementing CBME, however, comes with significant challenges. This manuscript describes four overarching challenges that must be confronted by medical educators worldwide in the implementation of CBME: (1) the need to align all regulatory stakeholders in order to facilitate the optimization of training programs and learning environments so that they support competency-based progression; (2) the purposeful integration of efforts to redesign both medical education and the delivery of clinical care; (3) the need to establish expected outcomes for individuals, programs, training institutions, and health care systems so that performance can be measured; and (4) the need to establish a culture of mutual accountability for the achievement of these defined outcomes. In overcoming these challenges, medical educators, leaders, and policy-makers will need to seek collaborative approaches to common problems and to learn from innovators who have already successfully made the transition to CBME

Acetabular dysplasia

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