Summary AETOS Shoulder System is a metaphyseal, in-lay humeral platform that recenters on the anatomic neck cut, uses concentric humeral heads, and is delivered with a streamlined tray workflow for efficient anatomic and reverse shoulder arthroplasty. It is used for anatomic TSA with an anatomic 4-peg glenoid and for reverse RSA via the Meta Stem. Indications Indications primary anatomic total shoulder arthroplasty using AETOS anatomic glenoid with Meta Stem or Stemless humeral components reverse shoulder arthroplasty using AETOS reverse baseplate/glenosphere constructs with the AETOS Meta Stem stemless humeral prosthesis login to view 1 more bullet Contraindications active infection insufficient bone stock neuromuscular disorders Anatomy Osteology anatomic neck login to view 2 more bullets greater and lesser tuberosities login to view 2 more bullets glenoid vault and inferior rim login to view 2 more bullets Muscles subscapularis management login to view 11 more bullets Ligaments emphasizes coracohumeral ligament and anterior/inferior capsule partial preservation of posterior capsule can help centralize the humeral head during trialing Nerves axillary nerve login to view 2 more bullets musculocutaneous nerve login to view 1 more bullet Blood supply anterior humeral circumflex vessels encountered at the inferior subscapularis border login to view 2 more bullets Approach Standard deltopectoral incision centered on the coracoid/anterior shoulder axis Technical Specifications Humeral Meta Stem four sizes (1–4) with an in-lay collar geometry for flush seating on the resection cruciate fins in A/P and M/L planes for metaphyseal stability Humeral heads AETOS Humeral Head Offerings Size Width Height Spherical ø 38-14 38mm 14mm 41mm 41-15 41mm 15mm 44.25mm 44-16 44mm 16mm 47.50mm 44-18 44mm 18mm 45.56mm 47-16 47mm 16mm 52.16mm 47-18 47mm 18mm 49.64mm 50-18 50mm 18mm 50mm 50-21 50mm 21mm 51.31mm 53-19 53mm 19mm 57.25mm 53-22 53mm 22mm 54.51mm Anatomic glenoid XS/S/M/L sizes login to view 1 more bullet four pegs nine longitudinal flutes designed for cement interdigitation Posterior Augment Poly Thickness Specifications Glenoid base size 5° correction 10° correction XS 4.4mm 6.2mm S 4.8mm 6.4mm M 5.2mm 6.5mm L 5.6mm 6.8mm Baseplates centered, eccentric, and 10°/15° full-wedge shapes porous-coated fixation surfaces central post approximately 9 × 15 mm login to view 1 more bullet post extension options login to view 2 more bullets Glenospheres 34/38/42-mm diameters in concentric or eccentric variants lateralization options login to view 2 more bullets Reverse liners and spacers standard or retentive liners in +0/+3/+6 mm +9mm spacer enables +9/+12/+15mm buildup anti-rotation tabs and positive stem lock-in features Screws Central screw 4.5mm diameter, available in 7 lengths Peripheral screw options 4.5mm screws in 8 lengths