In UKR, just one of three compartments of the knee – the medial compartment – is replaced with a prosthesis. Because the UKR technique preserves most of the normal knee anatomy, it has some advantages over the more common total knee replacement. However, patients undergoing UKR appear to have a higher rate of repeat or revision surgery.
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The increasing proportion of patients with higher BMI in need of knee replacement is “a pressing challenge for orthopedic surgeons,” according to the authors. There are conflicting data on how BMI affects the outcomes of UKR, which can be performed using either cemented or cementless techniques. This new study assessed how BMI affects the long-term outcomes of both UKR techniques.
The study compared two matched groups of 5,220 patients undergoing UKR from 2004 through 2018. The unicompartmental implants were placed using a cementless technique in one group of patients and a cemented technique in the other group. All procedures were performed using cemented or cementless versions of the same type of implant (the Oxford mobile bearing UKR).
Patients were classified into three BMI groups, based on body weight and height: 18.5 to
The overall 10-year implant survival rate was 90.1% for cemented and 92.8% for cementless UKR. For patients undergoing cemented UKR, the revision rate increased with BMI. The rate of revisions per 100 component years was 0.92 in patients with BMI of 18.5 to
‘Cementless Fixation may be Preferable’ in Patients with Higher BMI
“However, this was not observed for the cementless UKR,” Dr. Mohammad and colleagues write. The revision rate was 1.09 in the BMI 18.5 to
In the BMI 18.5 to
Overall, the revision risk for cementless UKR was about 40% lower in the BMI 25 to
Source: Eurekalert
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