Publications by authors named "P Raiss"
Objective: This study evaluated the effects of bony increased offset (BIO) and metallic augments (MAs) on primary reverse shoulder arthroplasty (RSA) baseplate stability in cadaveric specimens with variable bone densities.
Methods: Thirty cadaveric specimens were analyzed in an imaging and biomechanical investigation. Computed tomography (CT) scans allowed for preoperative RSA planning and bone density analysis.
Objective: This study evaluated the effect of three-dimensional (3D) volumetric humeral canal fill ratios (VFR) of reverse shoulder arthroplasty (RSA) short and standard stems on biomechanical stability and bone deformations in the proximal humerus.
Methods: Forty cadaveric shoulder specimens were analyzed in a clinical computed tomography (CT) scanner allowing for segmentation of the humeral canal to calculate volumetric measures which were verified postoperatively with plain radiographs. Virtual implant positioning allowed for group assignment (VFR < 0.
Article Synopsis
- The study aimed to analyze how scapulothoracic orientation affects simulated range of motion (ROM) in reverse total shoulder arthroplasty (rTSA), expecting notable differences between adjusted and unadjusted values.
- Using CT scans from ten shoulder patients, six surgeons independently planned rTSA with software that adjusted for scapular orientation, comparing various movement planes.
- Results showed significant differences in all movement planes with adjustments leading to lower ROM values, particularly in external rotation, extension, and internal rotation, indicating the importance of posture in preoperative planning for rTSA.
Convertible glenoid replacement in the anatomical total shoulder arthroplasty: medium-term results.
Arch Orthop Trauma Surg
September 2024
Article Synopsis
- The study aimed to evaluate the medium-term clinical and radiological outcomes of a new thinner metal-backed glenoid prosthesis, addressing high failure rates of older versions.
- Thirty-nine patients with specific shoulder conditions were analyzed over a follow-up period of 2 to 10 years, where significant improvement in shoulder function was noted following surgery.
- While some radiological issues were observed, such as osteolysis and humeral migration, overall results showed promising enhancement in function and satisfaction among patients.
Article Synopsis
- Reduced bone density is identified as a risk factor for complications in reverse shoulder arthroplasty (RSA), prompting the need for effective methods to quantify bone quality using preoperative CT scans.
- The study involved three main steps: developing a patient-specific calibration method with cadaveric CT scans, applying this method to a cohort of 345 RSA patients, and utilizing machine learning for better analysis and classification of bone density data.
- Results showed that the patient-specific calibration method significantly improved accuracy for measuring bone densities, effectively classified patients into high and low-density groups, and provided better predictions using machine learning techniques compared to traditional methods.