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Pathology & Biomechanics of Unicompartmental Arthritis

Pathology & Biomechanics of Unicompartmental Arthritis. John Goodfellow Nuffield Orthopaedic Centre, Oxford. Extreme case. Antero-medial OA Functionally intact ACL. Typical cases. Posterior. Posterior. Posterior. Anterior. Anterior. Anterior. Preserved Cartilage. Lost Cartilage

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Pathology & Biomechanics of Unicompartmental Arthritis

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  1. Pathology & Biomechanics of Unicompartmental Arthritis John Goodfellow Nuffield Orthopaedic Centre, Oxford

  2. Extremecase

  3. Antero-medial OA Functionally intact ACL Typical cases Posterior Posterior Posterior Anterior Anterior Anterior

  4. Preserved Cartilage Lost Cartilage & Bone Antero-medial OA

  5. Loss of cartilage & bone Varus deformity Varus deformity corrects in flexion Preserved Cartilage Medial collateral ligament lax Medial collateral ligament tight Lost Cartilage & Bone Prevents ligament shortening Antero-medial OA

  6. Varus deformity corrects in flexion Medial collateral ligament tight Prevents ligament shortening Antero-medial OA Correctable Varus Deformity

  7. Loss of cartilage & bone Posteriorly Varus deformity persists in flexion ACL Intact Medial collateral ligament lax Medial collateral ligament lax MCL short Fixed deformity ACL rupture

  8. Extremecase

  9. Extreme case

  10. Deformity corrects in flexion Bone preserved posteriorly

  11. Deformity correctswith stress

  12. Anteromedial Osteoarthritis • Cartilage loss limited to ANTERIOR TIBIAL PLATEAU INFERIOR FEMORAL CONDYLE • ACL INTACT • CORRECTABLE VARUS DEFORMITY

  13. Varus Valgus

  14. ACL+ ACL+ ACL? ACL- Gross (sublux) Lateral X-ray ANTERIOR Posterior extent of cartilage loss correlates with the state of the ACL

  15. AnteromedialOsteoarthritis

  16. Thank you

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