Related Experiment Video
Updated: Jan 29, 2026
10:10
Reverse Total Shoulder Arthroplasty
Published on: July 5, 2011
43.9K
Cementless metaphyseal reverse shoulder arthroplasty: our preliminary experience
Gian Mario Micheloni1, Gianpaolo Salmaso, Mattia Berti
1Department of Orthopaedic Surgery, Azienda Ospedaliera Universitaria Integrata, Polo Chirurgico P. Confortini, Verona, Italy. gianmario.micheloni@libero.it.
Acta Bio-Medica : Atenei Parmensis
|February 5, 2019
Summary
Metaphyseal stem reverse shoulder arthroplasty (rTSA) shows promising short-term results for osteoarthritis and acute fractures. This technique preserves bone stock and offers easier revision, with significant improvements in function and pain relief.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
Background:
- Reverse shoulder arthroplasty (rTSA) is increasingly common for various shoulder conditions.
- Metaphyseal stem rTSA offers potential advantages in bone preservation and revision surgery.
Purpose of the Study:
- To evaluate the short-term clinical and radiological outcomes of cementless metaphyseal stem rTSA.
- To assess the efficacy of this implant in patients with osteoarthritis and acute fractures.
Main Methods:
- A cohort of 19 patients undergoing cementless metaphyseal stem rTSA was analyzed.
- Patients were divided into two groups: osteoarthritis (Group A) and acute fractures (Group B).
- Clinical outcomes were assessed using the Constant score, Simple Shoulder Test (SST), and VAS pain score.
Main Results:
- In Group A (osteoarthritis), Constant score improved from 21.57 to 56.85, SST from 2.29 to 9.43, and VAS from 14.29 to 4.86.
- In Group B (fractures), mean Constant-Murlay score was 42.17, SST was 7, and pain score was 8.92.
- Significant improvements in active range-of-motion and low complication rates were observed overall.
Conclusions:
- Cementless metaphyseal stem rTSA demonstrates encouraging short-term clinical and radiological results.
- The procedure appears beneficial for both osteoarthritis and acute fracture indications, with good functional recovery.
- Further long-term follow-up studies are warranted to confirm sustained benefits and implant durability.
Related Concept Videos
01:23Muscles of the Shoulder
9.1K
The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...
9.1K
01:12What is an Experiment?
17.9K
An experiment is a planned activity carried out under controlled conditions. The purpose of an experiment is to investigate the relationship between two variables. When one variable causes change in another, we call the first variable the explanatory or independent variable. The affected variable is called the response or dependent variable. In a randomized experiment, the researcher manipulates values of the explanatory variable and measures the resulting changes in the response variable. The...
17.9K
01:14Reversible and Irreversible Processes
5.8K
The thermodynamic processes can be classified into reversible and irreversible processes. The processes that can be restored to their initial state are called reversible processes. It is only possible if the process is in quasi-static equilibrium, i.e., it takes place in infinitesimally small steps, and the system remains at equilibrium However, these are ideal processes and do not occur naturally. An ideal system undergoing a reversible process is always in thermodynamic equilibrium within...
5.8K
01:14Diode: Reverse bias
1.9K
A diode is reverse-biased when the positive terminal of an external voltage source is connected to the n-type material and the negative terminal to the p-type material. This configuration opposes the natural direction of current flow through the diode, effectively increasing the width of the depletion region and the barrier potential. The reverse bias condition produces a minimal leakage current, primarily due to minority charge carriers. This leakage becomes significant when the reverse...
1.9K
01:19Thomson's e/m Experiment
6.7K
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
6.7K
01:13Controls in Experiments
16.9K
When conducting an experiment, it is crucial to have control to reduce bias and accurately measure the dependent variables. It also marks the results more reliable. Controls are elements in an experiment that have the same characteristics as the treatment groups but are not affected by the independent variable. By sorting these data into control and experimental conditions, the relationship between the dependent and independent variables can be drawn. A randomized experiment always includes a...
16.9K