Evaluation of Shoulder Strength and Deltoid Stiffness After Reverse Shoulder Arthroplasty (RSA)

Primary outcomes

1. shear wave elastography (SWE)

   Time frame: Through study completion, an average of 8 weeks

   SWE provides an indirect measure of a tissue's mechanical properties by quantifying the speed at which sound waves propagate through soft tissue. Shear wave elastography will be carried out once for both shoulders before the isokinetic tests

2. shoulder adduction strength

   Time frame: Through study completion, an average of 8 weeks

   adduction strength of both shoulders will be measured by the isokinetic test method. It will be carried out once for both shoulders for each patient. To measure the muscle strength, the average peak torque (nm) done with four repetitions at a velocity of 60 /sec was determined. It will be carried out once for both shoulders for each patient. Results will be presented in newton metre (nm) unit

3. shoulder adduction endurance

   Time frame: Through study completion, an average of 8 weeks

   endurance strength of both shoulders will be measured by the isokinetic test method. It will be carried out once for both shoulders for each patient. To measure the muscle strength, the average peak torque (nm) done with four repetitions at a velocity of 180 /sec was determined. It will be carried out once for both shoulders for each patient. Results will be presented in newton metre (nm) unit.

4. modified Constant shoulder outcome score

   Time frame: It will be carried out once for each patient, through study completion, an average of 8 weeks

   Patients will fill the constant score questionnaire to evaluate the functional status of operated shoulder. The modified Constant score will be used to determine the functionality after the treatment of a shoulder injury. The test is divided into four subscales: pain (15 points), activities of daily living (20 points), strength (25 points) and range of motion: forward elevation, external rotation, abduction and internal rotation of the shoulder (40 points).The higher the score, the higher the quality of the function

5. American Shoulder Elbow Surgeons (ASES) orthopedic score

   Time frame: It will be carried out once for each patient, through study completion, an average of 8 weeks

   The ASES is a condition-specific scale that is intended to measure functional limitations and pain of the shoulder.

6. Quick shoulder disabilities arm shoulder and hand questionnaire (QuickDASH)

   Time frame: It will be carried out once for each patient, through study completion, an average of 8 weeks

   Patients will fill the quick disabilities of the arm, shoulder, and hand outcome measure questionnaire (the quick-DASH) to evaluate the functional status of operated shoulder.his questionnaire is a self-report questionnaire that patients can rate difficulty and interference with daily life on a 5 point Likert scale.t is a questionnaire that measures an individual's ability to complete tasks, absorb forces, and severity of symptoms.The QuickDASH tool uses a 5-point Likert scale from which the patient can select an appropriate number corresponding to his/her severity/function level.

7. shoulder abduction endurance

   Time frame: Through study completion, an average of 8 weeks

   to measure the shoulder abduction endurance, total work (nm) done with 15 repetitions at a velocity of 180/sec will be measured by an isokinetic dynamometer, results will be presented in newton metre (nm) unit

8. shoulder abduction strength

   Time frame: Through study completion, an average of 8 weeks

   adduction strength of both shoulders will be measured by the isokinetic test method. It will be carried out once for both shoulders for each patient. To measure the muscle strength, the average peak torque (nm) done with four repetitions at a velocity of 60 /sec was determined. It will be carried out once for both shoulders for each patient. Results will be presented in newton metre (nm) unit