Table 3.

Authors’ preferred guidelines for RSA implantation in the cuff-deficient shoulder (FIRCT)

Glenoid component	• Posteroinferior glenosphere overhang (2–5 mm) • Lateralization (2–10 mm)  ▪ Built into glenosphere  ▪ Built into baseplate  ▪ With bone (BIO-RSA) • Larger size glenospheres • Neutral or anatomic version • Neutral inclination as referenced to supraspinatus fossa (inferior tilt as referenced to the face of the glenoid)
Humeral component	• 135 or 145-degree polyethylene opening angle • Onlay vs inlay depends on patient/implant design
Soft tissue tension	• Ease of trial reduction and dislocation • Tension on deltoid and conjoined tendon
Subscapularis management	• Repaired when possible
Lat dorsi ± teres major transfer	• Very limited active external rotation • Positive Hornblower’s sign • Severe teres minor fatty infiltration