Component Rotation in Well-Functioning, Gap Balanced Total Knee Arthroplasty Without Navigation.

Background: Malalignment of total knee arthroplasty (TKA) components is a potential cause of clinical failure following TKA. Since the goal of a gap balancing (GB) technique is equal flexion and extension gaps secondary to soft-tissue balancing, and not necessarily component alignment, variation in component placement may exist. Our purpose was (1) to evaluate precision of component alignment in well-functioning GB TKAs performed without the aid of navigation using computed tomographic evaluation and (2) to determine any relationship between femoral version and/or tibial torsion and TKA component positioning.

Revision Total Knee Arthroplasty for Arthrofibrosis.

Background: Arthrofibrosis after TKA is a significant cause of patient dissatisfaction. There is little evidence regarding revision arthroplasty in this patient population. The purpose of this study is to evaluate outcomes after revision TKA for arthrofibrosis.

Radiographic Changes in Nonoperative Contralateral Knee After Unilateral Total Knee Arthroplasty.

Background: Some patients perceive symptomatic improvement in the contralateral knee after unilateral total knee arthroplasty (TKA). This so-called "splinting effect" has been observed but has not been radiographically evaluated.

Methods: A retrospective review of patients with bilateral knee osteoarthritis treated with unilateral TKA was performed.

What is the Long-term Economic Societal Effect of Periprosthetic Infections After THA? A Markov Analysis.

Background: Current estimates for the direct costs of a single episode of care for periprosthetic joint infection (PJI) after THA are approximately USD 100,000. These estimates do not account for the costs of failed treatments and do not include indirect costs such as lost wages.

Questions/purposes: The goal of this study was to estimate the long-term economic effect to society (direct and indirect costs) of a PJI after THA treated with contemporary standards of care in a hypothetical patient of working age (three scenarios, age 55, 60, and 65 years).

The Basics of the Sunshine Act: How It Pertains to the Practicing Orthopaedic Surgeon.

The Physician Payments Sunshine Act is a disclosure law requiring all drug, medical device, and biologics companies to report transfers of value to physicians and teaching hospitals. It was passed into law in 2010 as part of the Affordable Care Act. The first set of data was released via an online public database on September 30, 2014, with subsequent annual reports to come.

Does the addition of a nerve wrap to a motor nerve repair affect motor outcomes?

The purpose of this study was to evaluate the effect of wrapping bioabsorbable nerve conduit around primary suture repair on motor nerve regeneration in a rat model. Forty rats were randomly divided into two experimental groups according to the type of repair of the rat sciatic nerve: group I had primary suture repair; group II had primary suture repair and bioabsorbable collagen nerve conduit (NeuraGen® 1.5 mm, Integra LifeSciences Corp.

Meralgia paresthetica: relation to obesity, advanced age, and diabetes mellitus.

Objective: To determine the incidence of meralgia paresthetica (MP) and its relationship to diabetes mellitus (DM) and obesity.

Methods: A population-based study was performed within Olmstead County Minnesota, from January 1, 1990, to December 31, 1999. MP incidence and its association with age, gender, body mass index (BMI), and DM were reviewed.

Learning curve of robotic-assisted microvascular anastomosis in the rat.

We hypothesized that the learning plateau and learning rate of robotic-assisted microvascular anastomosis could be estimated statistically using curve-fitting method. Three surgeons with various microsurgical experiences performed 20 microsurgical anastomoses of the rat femoral artery using the da Vinci robotic system (Intuitive Surgical, Inc., Sunnyvale, CA).

Patterns of intraneural ganglion cyst descent.

On the basis of the principles of the unifying articular theory, predictable patterns of proximal ascent have been described for fibular (peroneal) and tibial intraneural ganglion cysts in the knee region. The mechanism underlying distal descent into the terminal branches of the fibular and tibial nerves has not been previously elucidated. The purpose of this study was to demonstrate if and when cyst descent distal to the articular branch-joint connection occurs in intraneural ganglion cysts to understand directionality of intraneural cyst propagation.