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From the Oslo Sports Trauma Research Center, Institute for Surgical Research, Akershus University Hospital, || Oslo University Orthopaedic Clinic, and a Martina Hansen Hospital.
* Address correspondence and reprint requests to Asbjørn Årøen, MD, Institute for Surgical Research, Rikshospitalet, University of Oslo, Sognsvannsveien 20, N-0027 Oslo, Norway.
Background: Traumatic articular cartilage injuries heal poorly and may lead to development of osteoarthritis at a young age. This study estimates the number of patients who may benefit from one of the surgical methods of cartilage repair.
Methods: All patients undergoing knee arthroscopy during a 6-month period at three collaborating hospitals were consecutively evaluated according to the International Cartilage Repair Society (ICRS) knee form. The material consists of 993 consecutive knee arthroscopies in patients with median age of 35 years.
Results: Preoperative radiographs demonstrated degenerative changes in 13% of the knees. Articular cartilage pathology was found in 66% and a localized cartilage defect was found in 20% of the knees. A localized full-thickness cartilage lesion (ICRS grade 3 and 4) was observed in 11% of the knees. Of the localized full-thickness lesions, 55% (6% of all knees) had a size above 2 cm2.
Conclusion: Eleven percent of all knee arthroscopies show cartilage defects that may be suitable for cartilage repair procedures. However, the natural history of these lesions and the number of patients that will benefit from a cartilage repair procedure are so far unknown.
Key Words: articular cartilage lesions • knee • arthroscopy • cartilage defect score
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