Surgical Parameters During Reverse Shoulder Arthroplasty Predict Post-Surgical Kinematics During the Hand-to-Head Motion.

Purpose: This study aimed to identify surgical parameters during reverse shoulder arthroplasty (RSA) that predict post-surgical kinematics during the hand-to-head motion (H2H) and to identify associations between kinematics and outcomes. We hypothesized that greater humeral retroversion and lateralization predict kinematics, and that more scapular upward rotation is associated with better PROs and more range of motion (ROM).

Methods: Thirty-five post-RSA patients consented to participate.

Rising Costs and Diminishing Surgeon Reimbursement From Primary to Revision Total Hip and Knee Arthroplasty: An Analysis of Medicare Advantage and Commercial Insurance.

Background: Revision total joint arthroplasty (rTJA) is a resource-intensive procedure addressing failed primary total joint hip (total hip arthroplasty [THA]) and knee arthroplasty (total knee arthroplasty [TKA]). Despite predictions of increased demand, reimbursement for rTJA has not kept pace with increasing costs and may be insufficient compared with primary procedures. The study aimed to highlight the diminishing surgeon reimbursement between primary and revision THA (rTHA) and TKA.

Reasons and Risk Factors for Failed Same-Day Discharge After Total Joint Arthroplasty.

Background: A shift toward same-day discharge (SDD) in primary elective total knee arthroplasty (TKA) and total hip arthroplasty (THA) has created a need to optimize patient selection and improve same-day recovery pathways. The objectives of this study were (1) to identify our institution's most common causes for failed SDD, and (2) to evaluate risk factors associated with failed SDD.

Methods: A retrospective review of SDD patients undergoing primary TKA or THA from January 2021 to September 2022 was conducted.

More anterior placement of femoral tunnel position in ACL-R is associated with postoperative meniscus tears.

Purpose: The purpose of this study was to investigate the relationship between tunnel position in ACL reconstruction (ACL-R) and postoperative meniscus tears.

Methods: This was a single institution, case-control study of 170 patients status-post ACL-R (2010-2019) separated into two matched groups (sex, age, BMI, graft type). Group 1-symptomatic, operative meniscus tears (both de novo and recurrent) after ACL-R.

Open Ischiofemoral Impingement Decompression.

Ischiofemoral impingement is a relatively rare cause of posterior hip pain associated with narrowing of the space between the lateral aspect of the ischium and the lesser trochanter. Symptoms typically consist of lower buttock, groin, and/or medial thigh pain, which is commonly exacerbated by adduction, extension, and external rotation of the hip. This condition can be treated nonoperatively in many circumstances; however, recalcitrant cases may require surgical intervention.

The presence of a draining sinus is associated with failure of re-implantation during two-stage exchange arthroplasty.

: Reinfection rates after two-stage exchange arthroplasty for prosthetic joint infection (PJI) have been reported as high as 33 % in the literature. Understanding risk factors for treatment failure will help to preoperatively counsel patients on the likelihood of successful treatment and possibly influence the surgeon's treatment algorithm. This study aimed to delineate whether the presence of a draining sinus tract is associated with risk of failure of two-stage exchange arthroplasty.

Implant characteristics affect in vivo shoulder kinematics during multiplanar functional motions after reverse shoulder arthroplasty.

The purpose of this study was to determine how implant characteristics affect in vivo shoulder kinematics after reverse shoulder arthroplasty (RSA). Kinematics of the affected upper limb were measured in 32 participants during five motions (scapular plane abduction, hand-to-head, hand-to-back, internal/external rotation at 90° abduction, and circumduction) using optical motion capture. Shoulder abduction, plane of elevation, and internal/external rotation range of motion (ROM), peak angles, and continuous kinematics waveforms were calculated for each motion.

Improved Outcomes Following Arthroscopic Superior Capsular Reconstruction May Not Be Associated With Changes in Shoulder Kinematics: An In Vivo Study.

Purpose: To determine the in vivo effects of superior capsule reconstruction (SCR) on glenohumeral kinematics during abduction and to compare those kinematics results with patient-reported outcomes, range of motion, and strength.

Methods: Dynamic biplane radiography was used to image 10 patients with irreparable rotator cuff tears while performing scapular plane abduction pre- and 1-year post-surgery. Shoulder kinematics were determined by matching subject-specific computed tomography-based bone models to the radiographs using a validated tracking technique.

Graft healing does not influence subjective outcomes and shoulder kinematics after superior capsule reconstruction: a prospective in vivo kinematic study.

Background: A viable treatment option for young patients with massive, irreparable rotator cuff tears is arthroscopic superior capsule reconstruction (SCR). SCR theoretically improves shoulder stability and function and decreases pain. However, no prospective studies to date have correlated magnetic resonance imaging (MRI) healing with in vivo kinematic data.

Bilateral Symmetry, Sex Differences, and Primary Shape Factors in Ankle and Hindfoot Bone Morphology.

Background: Ankle injuries and joint degeneration may be related to ankle bone morphology. Little data exist to characterize healthy hindfoot bone morphology. The purpose of this study was to characterize side-to-side symmetry and sex differences in ankle and hindfoot bone morphology, and to identify the primary shape factors that differentiate ankle and hindfoot bone morphology among individuals.

The Direct and Indirect Costs to Society of Carpal Tunnel Release.

Carpal tunnel syndrome (CTS) is one of the most common compressive neuropathies and affects a large amount of individuals. We investigated the direct and indirect cost to society of operative versus nonoperative management of CTS. A Monte Carlo simulation model was used to estimate the lifetime direct and indirect costs associated with nonoperative and operative treatment of CTS, and its utility to patients.