What is the measurement taken to determine the length of a TSA stem?

The correct approach to determine the length of a Total Shoulder Arthroplasty (TSA) stem is by measuring from the center of the inclination block to the distal tip. This measurement is critical as it aids in selecting the appropriate stem length for the humeral component, ensuring proper alignment and function post-surgery.

The inclination block is used during the surgical procedure to assess the optimal orientation of the humeral stem, allowing the surgeon to achieve the best possible fit and stability. By measuring from this block, the surgeon can precisely identify the length needed for the stem to accommodate the patient's specific anatomy and biomechanics.

Other measurement options do not provide the necessary information for stem length determination in TSA. For instance, measuring from the top of the shoulder to the elbow does not account for the unique anatomical changes associated with shoulder arthroplasty. Similarly, the length of the humeral head does not directly inform stem length, and measuring the distance from the shoulder joint to the wrist is irrelevant in this context. These alternatives either do not relate directly to the stem’s fit or function, making them unsuitable for determining the correct TSA stem length.