Today’s Top Story

Study: Relationship between Tibiofemoral Contact Forces and Intraoperative Kinematic Pivot Patterns in TKA

A study published in the April issue of the Journal of the AAOS: Global Research & Reviews ® found that tibiofemoral compartments with greater contact force had less anteroposterior translation at certain flexion ranges and correlated with kinematic pivot patterns after primary total knee arthroplasty (TKA). Sensor-embedded tibial trials were used intraoperatively in 157 TKAs. For ligament-intact TKAs, increased medial and lateral compartment forces predicted medial and lateral pivots for mid and late flexion, respectively. Increased lateral compartment force predicted lateral pivot in early and midflexion, but not late flexion, for ligament-resected TKAs.

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In Other News

Study: Female Sex and Decreased Hip Capsule Thickness Are Associated with Increased Axial Distraction Distance in Hip Arthroscopy Patients

According to a retrospective study published online in The Journal of Arthroscopy, female sex, decreased hip capsule thickness, and anterior capsular thickness were predictors of increased hip joint axial distraction distance. Eighty patients who underwent arthroscopy for femoroacetabular impingement were evaluated. Bivariable regression demonstrated that increased distraction distance was associated with female sex, decreased anterior axial and superior coronal capsular thickness. Multivariable analysis found increased distraction distance in females and in patients with decreased superior coronal capsular thickness.

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Study Finds Multiple Predictors Associated with Bilateral Posterosuperior Rotator Cuff Tear

In patients with unilateral posterosuperior rotator cuff tear (PSRCT), age ≥61 years, manual labor, critical shoulder angle of ≥35 degrees, Patte retraction degree grade ≥2, biceps tendon injury, and cardiovascular risk factors were predictors of PSRCT in the other shoulder, according to a study published online in The American Journal of Sports Medicine. In total, 736 patients with MRI-confirmed PSRCT were included. Combinations of any four of the six associated factors were highly predictive of bilateral PSRCT.

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Study: Trends in Outcomes and Operating Times for Surgical Stabilization of Rib Fractures

A retrospective study published in the May issue of Injury found improvements over time in the outcomes of surgical stabilization of rib fractures. However, operating time increased. In total, 222 patients treated between 2010 and 2020 were identified from a prospective database. Patients had a median age of 54 years, Injury Severity Score of 19 out of 26, Rib Score of 3, and a median of eight fractured ribs. Increasing procedure year was associated with longer operating times but a notably reduced risk of complications, use of ventilation, and days spent in intensive care units or in the hospital.

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Study: Outcomes and Complications in Multilevel PCF without Cervicothoracic Junction Crossing

A systematic review published in the May issue of The Spine Journal reported that posterior cervical fusion (PCF) without crossing the cervicothoracic junction (CTJ) led to better fusion rates, less blood loss, and shorter operating times but higher incidence of adjacent segment disease (ASD) and related complications compared with PCF which crossed the CTJ. Eight studies met inclusion criteria. Mean blood loss and operation time was lower with PCF without CTJ crossing, but mean hospital stay and complication rates were similar regardless of CTF crossing.

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AAOS Now

The One-stage Exchange: Video Covers Management of Periprosthetic Joint Infection following Total Hip Arthroplasty

In this Orthopaedic Video Theater review, Thomas Fleeter, MD, MBA, FAAOS, discusses a video describing the one-stage exchange technique for managing periprosthetic joint infection following total hip arthroplasty. The video includes tips for identifying ideal candidates for one-stage exchange, seven steps for successfully completing this procedure, and a discussion of existing literature regarding this technique.

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Your AAOS

Refresh Your Surgical Skills for Total Knee Arthroplasty

Make plans to attend the hands-on AAOS Innovative Techniques in Total Knee Arthroplasty surgical skills course, Sept. 23 to 25 in Rosemont, Ill. Elevate and expand your approaches for partial, primary, and revision knee replacement with best practices and new technologies. Highlights include over six hours of lab time plus expanded content on cutting-edge technology, including navigation, robotics, augmented reality, and more. Early-bird savings end July 25.

Learn more and register…