In rTSA phase 2, which muscle activation is emphasized?

In rTSA phase 2, which muscle activation is emphasized?

• A. Deltoid Isometrics
• B. Subscapularis Isometrics
• C. Infraspinatus Isometrics
• D. Pectoralis Major Isometrics

Answer: (A)

In this stage of reverse total shoulder arthroplasty rehab, the key idea is that the deltoid becomes the primary driver of shoulder elevation. The prosthesis design changes how the humeral head is centered, making the deltoid the main muscle to lift the arm while the rotator cuff’s usual contribution is limited. Because of this, early phase 2 focuses on activating and strengthening the deltoid with isometric contractions. Isometrics let you recruit the deltoid and promote neuromuscular re-education and joint stability without moving the joint through provocative ranges that could stress healing tissues or the implant. This approach protects the repair while gradually restoring function and preparing for progressive strengthening. Other muscles, like the subscapularis or infraspinatus, aren’t the primary drivers of elevation after a reverse prosthesis, and activating the pectoralis major early could complicate movement patterns or load safety, so the emphasis remains on the deltoid during this phase.

In this stage of reverse total shoulder arthroplasty rehab, the key idea is that the deltoid becomes the primary driver of shoulder elevation. The prosthesis design changes how the humeral head is centered, making the deltoid the main muscle to lift the arm while the rotator cuff’s usual contribution is limited. Because of this, early phase 2 focuses on activating and strengthening the deltoid with isometric contractions. Isometrics let you recruit the deltoid and promote neuromuscular re-education and joint stability without moving the joint through provocative ranges that could stress healing tissues or the implant.

This approach protects the repair while gradually restoring function and preparing for progressive strengthening. Other muscles, like the subscapularis or infraspinatus, aren’t the primary drivers of elevation after a reverse prosthesis, and activating the pectoralis major early could complicate movement patterns or load safety, so the emphasis remains on the deltoid during this phase.