Which postoperative complication can arise from improper implant positioning in TSA?

Improper implant positioning during Total Shoulder Arthroplasty (TSA) can lead to joint instability or failure, making this the correct answer. When the components of the shoulder implant are not aligned correctly, it can disrupt the natural mechanics of the shoulder joint. This misalignment can cause excessive wear on the implants, limit the range of motion, and increase the likelihood of dislocation. Over time, these issues can result in significant instability at the joint, making it difficult for patients to regain full function and potentially leading to the need for revision surgery.

Other potential postoperative complications, such as increased joint pain, may occur but are often secondary effects of improper positioning rather than direct complications. Conditions like pneumonia and excessive scarring are generally unrelated to the specific positioning of the implant and are more associated with overall surgical risk factors or healing processes rather than the mechanics of the shoulder joint itself.