THE MAGNETIC RESONANCE IMAGING DESCRIPTION OF ANTEROMEDIAL OSTEOARTHRITIS OF THE KNEE

Bottomley N, McNally E, Ostlere S, et al. THE MAGNETIC RESONANCE IMAGING DESCRIPTION OF ANTEROMEDIAL OSTEOARTHRITIS OF THE KNEE. Orthop Procs. 2010;92-B(SUPP_III):416-416. doi:10.1302/0301-620X.92BSUPP_III.0920416d

Bottomley, NJ, et al. “THE MAGNETIC RESONANCE IMAGING DESCRIPTION OF ANTEROMEDIAL OSTEOARTHRITIS OF THE KNEE.” Orthopaedic Proceedings, vol. 92-B, no. SUPP_III, 2010, pp. 416-416., https://doi.org/10.1302/0301-620X.92BSUPP_III.0920416d

Bottomley, N., McNally, E., Ostlere, S., Beard, D., Gill, H., Kendrick, B., Jackson, W., Gulati, A., Simpson, D., Murray, D., Dodd, C., & Price, A. (2010). THE MAGNETIC RESONANCE IMAGING DESCRIPTION OF ANTEROMEDIAL OSTEOARTHRITIS OF THE KNEE. Orthopaedic Proceedings, 92-B(SUPP_III), 416-416. https://doi.org/10.1302/0301-620X.92BSUPP_III.0920416d

Bottomley, N., McNally, E., Ostlere, S., Beard, D., Gill, H., Kendrick, B. et al. (2010) “THE MAGNETIC RESONANCE IMAGING DESCRIPTION OF ANTEROMEDIAL OSTEOARTHRITIS OF THE KNEE.” Orthopaedic Proceedings, 92-B(SUPP_III), pp. 416-416. Available at: https://doi.org/10.1302/0301-620X.92BSUPP_III.0920416d

Bottomley, NJ, EG McNally, S Ostlere, DJ Beard, HS Gill, BJL Kendrick, W Jackson, et al. “THE MAGNETIC RESONANCE IMAGING DESCRIPTION OF ANTEROMEDIAL OSTEOARTHRITIS OF THE KNEE.” Orthopaedic Proceedings 92-B, no. SUPP_III (2010): 416-416. https://doi.org/10.1302/0301-620X.92BSUPP_III.0920416d

Bottomley N, McNally E, Ostlere S, Beard D, Gill H, Kendrick B, et al. THE MAGNETIC RESONANCE IMAGING DESCRIPTION OF ANTEROMEDIAL OSTEOARTHRITIS OF THE KNEE. Orthop Procs. 2010 Jul 1;92-B(SUPP_III):416-416. https://doi.org/10.1302/0301-620X.92BSUPP_III.0920416d

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Abstract

Introduction: This study explores whether modern magnetic resonance imaging (MRI) with improved cartilage sequencing is able to show a more detailed view of anteromedial osteoarthritis of the knee (AMOA). Preoperative assessment of patients and selection of intervention is very important and preoperative imaging forms an integral part of this. Modern MRI technology may allow us to visualize in great detail the structures and cartilage within the knee, providing a better understanding of the pathoanatomy of AMOA. This will be useful in preoperative assessment and surgical management of patients.

Methods: 50 patients with a radiographic diagnosis of anteromedial osteoarthritis of the knee and had been listed for unicompartmental knee arthroplasty (UKA) had MRI as part of their pre-op workup. At operation all were deemed suitable for UKA using the current Oxford indications. The image sequences were coronal, axial and sagittal with a predetermined cartilage protocol. The state of the ACL, cartilage wear location and pattern, presence of osteophytes and subchondral high signal were assessed.

Results: All the ACLs were visualized and in continuity, however 40% showed intrasubstance high signal.

100% of medial compartments showed full thickness anteromedial loss with preservation of the posteromedial cartilage. When present, the meniscus was extruded in 96% of cases.
90% of lateral compartments were normal and none had full thickness cartilage loss. However 10% showed high signal in the tibial plateau.
There was a highly reproducible pattern of osteophyte formation; 94% posteromedial and posterolateral aspect of medial femoral condyle; 90% medial tibial; 80% medial femoral and 84% lateral intercondylar notch.

Discussion: This study maps the pattern of anteromedial osteoarthritis using modern MRI techniques. This has importance in determining preoperative indications (preservation of ACL and posteromedial cartilage); surgical technique (determine pattern of osteophytes requiring resection) and potentially important for long-term outcome (early lateral compartment changes).

Correspondence should be addressed to: BASK c/o BOA, at the Royal College of Surgeons, 35–43 Lincoln’s Inn Fields, London, WC2A 3PE, England.