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Study: Radial meniscal displacement present prior to partial replacement increases after 3 months
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TORONTO — Patients with polyurethane meniscal scaffolds showed clinical signs of improvement in the knee at 3 months, 12 months and 24 months postoperatively based on their Visual Analog Scale, Lysholm and International Knee Documentation Committee scores. However, investigators observed radial displacement of the scaffolds on MRI and found no correlation between radial displacement and clinical outcomes.
In his presentation at the International Society of Arthroscopy, Knee Surgery & Orthopaedic Sports Medicine Congress here, Peter Verdonk, MD, PhD, of Zeijnaarde, Belgium presented study results of 26 patients who were treated with the scaffold (eight lateral cases and 18 medial cases). Mean patient age was 35 years. Using coronal MRI to look at meniscal rim thickness compared to extrusion, Verdonk said he and his colleagues found distinct patterns of displacement and other changes in each compartment.
Peter Verdonk
“Extrusion happens at the time of partial meniscectomy on the medial side,” he said.
Results showed no correlation at any time point between lateral radial displacement of the scaffold and rim status. There was a significant increase in radial displacement of medial scaffolds by 2 mm after surgeons implanted the scaffolds.
“Radial displacement correlates with rim thickness, meaning the thicker the rim the less radial displacement,” Verdonk said.
He said some of the findings were similar to what researchers have observed with meniscus allograft transplantation.
“This seems to be a class effect of meniscus substitution,” he said.
Reference:
Verdonk P. #32. Presented at: The International Society of Arthroscopy, Knee Surgery & Orthopaedic Sports Medicine Congress; May 12-16, 2013; Toronto.
Disclosure: Verdonk is on the speaker’s bureau for and is an employee of Orteq Sports Medicine, DePuy Implants, Smith & Nephew Endoscopy and Active Implants; and has stock with Orteq Sports Medicine.