What three neck angles are offered within Polarstem?

What three neck angles are offered within Polarstem?

• A. Standard 130; Lateral 125; Valgus 140
• B. Standard 135; Lateral 126; Valgus 145
• C. Standard 135; Lateral 126; Valgus 155
• D. Standard 135; Lateral 126; Valgus 145

Answer: (D)

Understanding how neck angles influence implant alignment helps you see why these three options are offered. The neck angle determines how the artificial head sits relative to the stem, which changes humeral offset, deltoid tension, and the risk of impingement. In Polarstem, the available neck angles are Standard 135 degrees, Lateral 126 degrees, and Valgus 145 degrees. This combination—135, 126, and 145 degrees—is the only set that matches the product’s listed offerings, which is why it’s the correct choice. Other listed options include angles Polarstem does not provide, so they don’t reflect the actual available configurations.

Understanding how neck angles influence implant alignment helps you see why these three options are offered. The neck angle determines how the artificial head sits relative to the stem, which changes humeral offset, deltoid tension, and the risk of impingement. In Polarstem, the available neck angles are Standard 135 degrees, Lateral 126 degrees, and Valgus 145 degrees. This combination—135, 126, and 145 degrees—is the only set that matches the product’s listed offerings, which is why it’s the correct choice. Other listed options include angles Polarstem does not provide, so they don’t reflect the actual available configurations.