Durability of TKA in comparision with UKA for Morbidly Obese
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Unicompartmental knee arthroplasty (UKA) indications have expanded during the past two decades to include some morbidly obese patients (body mass index (BMI) more than 40 kg/m2). Few published studies have compared UKA and total knee arthroplasty (TKA) in this unique patient subgroup with conflicting observations.

Researchers retrospectively compared 89 mobile bearing UKA (71 patients) and 201 TKA (175 patients) performed at a single institution with a minimum 2-year follow-up (mean 3.4 years). Demographic characteristics were similar for both patient cohorts. A detailed medical record review was performed to assess the frequency of component revision, revision indications, minor secondary procedures, and infections.

Results:
--UKA was more frequently associated with clinical failure (29.2% vs 2.5%) and component revision (15.7% vs 2.5%),
--TKA was more frequently associated with extensor mechanism complications or knee manipulation (5.5% vs 0.0%), and
--No difference in infection rate was observed (3.0% vs 2.2%).

Conclusively, early complications were lower following UKA but were outweighed by higher component revision rates for arthritis progression and implant failure. The study findings suggest that TKA provides a more predictable mid-term outcome for morbidly obese patients considering knee arthroplasty surgery.

Source: https://www.sciencedirect.com/science/article/abs/pii/S0883540320312997?dgcid=rss_sd_all
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