Erratum to 'Unicondylar Knee Arthroplasty Following a Patellectomy' [Arthroplasty Today 6 (2020) 48-51].

[This corrects the article DOI: 10.1016/j.artd.2019.10.005.].

Unicondylar knee arthroplasty following a patellectomy.

We present a case of a 59-year-old woman with a history of a right-sided patellectomy. She presented with right-sided anteromedial osteoarthritis. A unicondylar knee arthroplasty was performed. In the literature, we found only a few similar cases, with varying results. The woman in this case showed excellent postoperative clinical results. We concluded that a patellectomy may not be a contraindication for unicondylar knee arthroplasty in patients with isolated medial compartment osteoarthritis.

Partial resection of the PCL insertion site during tibial preparation in cruciate-retaining TKA.

PURPOSE: Based on the anatomy of the tibial PCL insertion site, we hypothesized that at least part of it is damaged while performing a standard tibial cut in a PCL-retaining total knee replacement. The purpose of this study was to determine and quantify the amount of resection of the tibial PCL attachment with a 9 mm tibial cut with 3 degrees of posterior slope. METHODS: Twenty cadaver tibias were used. The borders of the PCL footprint were demarcated, and calibrated digital pictures were taken in order to determine the surface area. A standard tibial intramedullary guide was used to prepare and perform a tibial cut at a depth of 9 mm with 3 degrees posterior slope. After the tibial cut was made, a second digital picture was taken using the same methodology to measure the surface area of the remaining PCL insertion. RESULTS: The mean surface area of the intact tibial PCL footprint before the cut was 148.9 ± 25.8 mm(2) and after the tibial cut 47.1 ± 28.0 mm(2). On average, 68.8 ± 15.3 % of the surface area of the PCL insertion was removed. CONCLUSION: The results of this study, therefore, indicate that the conventional technique for tibial preparation in cruciate-retaining total knee arthroplasty can result in damage or removal of a significant part of the tibial PCL insertion.

Migratory symptomatic bone marrow oedema of the knee: a case report and literature review.

Bone marrow oedema is a common finding on MRI. Differential diagnosis includes many different clinical entities. We hereby present a case of migrating symptomatic bone marrow oedema from the medial to the lateral femoral condyle after which spontaneous resolution of both clinical and radiographic findings occurred. The role of altered weight-bearing due to therapeutic use of an unloading brace as a potential causative factor in the pathogenesis of migrating bone marrow oedema remains unclear. The literature on the topic is reviewed.