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Humeral shafts
Zimmer Biomet has issued a medical device recall for two lots of Comprehensive Humeral stems. These stems were manufactured concurrently but were etched with the wrong lot numbers. This results in two different sizes, which differ by 1.1 inches. The label on the box of the device does not match the contents. It is therefore important for surgeons to check the packaging and the lot number to make sure that they are ordering the correct part.
While the theoretical benefits of using shorter humeral components outweigh the risks, the literature shows that these implants are less effective than stemless designs. In a recent study, researchers at the University of Illinois, Chicago, reported a reduction in the risk of complications compared with stemless components. The authors of this study concluded that the shorter humeral component led to reduced blood loss and a reduction in postoperative pain and recovery time. These findings suggest that the longer stems have less adverse effects than the shorter ones.
Shoulder Innovations also offers a titanium alloy Humeral Stem with a Tri-flange metaphyseal design. It also features proprietary curved fins to increase rotational stability. The cobalt-chrome humeral head is available in multiple head heights and eccentricity. These components are available in a number of lengths to meet the needs of patients. And shoulder Innovations' Titanium alloy Humeral Stem is a perfect choice for most patients.
The shorter stems have several advantages. They are easier to insert and provide better alignment than long stemmed versions. Moreover, they do not have a diaphyseal stress riser, which can result in valgus and varus malalignment. Furthermore, they are easier to remove at revision. Additionally, short stems can facilitate the insertion of a humeral head independent of the axis of the bone.
Shorter humeral stems are advantageous in many ways. They help preserve bone stock. They are also easier to remove at a later date. These features make them an ideal choice for patients with distorted humeral anatomy. But if they cannot be repaired, they can be replaced with a short-stem humeral implant. It's crucial to ensure that a patient's proximal humeral anatomy is preserved during surgery.
Short-stem humerals are used when a patient is unable to have surgery due to their disability. This treatment is suitable for people with a limited range of motion. It can be applied in the reverse shoulder arthroplasty as well. As a result, it is safe and effective. Unlike the monoblock, the stemless humeral component is more stable. The implant's apposition does not cause any additional pain.
Long-stem humerals are used in cases where there is significant proximal bone loss and large humeral canals. A short-stem may need to be fixed with cement. However, a long-stem is still a viable option for patients with severe humeral deformity. The short-stem humeral arthroplasty is more successful than a long-stemmed arthroplasty.