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Table 1 Types of findings on MRI and related advice

From: Efficacy of MRI in primary care for patients with knee complaints due to trauma: protocol of a randomised controlled non-inferiority trial (TACKLE trial)

Positive findings (advice for referral to orthopaedic surgeon) Equivocal findings (advice based on radiologist’s judgement) Negative findings (advice for treatment in primary care)
Pigmented villonodular synovitis Synovitis, bursitis, hoffitis, any other cyst Effusion, Baker’s cyst, ganglion, plica, subcutaneous oedema
  Lesions of the m. quadriceps tendon, the patellar tendon or the patellar retinacula  
Osteochondrosis dissecans fracture Lesions of the trochlea or patellar alignment anomalies Bone bruise or bone marrow oedema
Meniscal tears*   Parameniscal cyst, meniscal extrusion, discoid meniscus, isolated lesions of meniscal ligaments or meniscal capsular lesions
Partial or complete anterior or posterior cruciate ligament tears   Mucoid degeneration of the cruciate ligaments
Grade III injury (complete rupture) of the medial collateral ligament or the posterolateral corner   Grade I and II injury of the medial collateral ligament or the posterolateral corner
Grade IV chondromalacia   Grade I to III chondromalacia
  1. *A meniscal tear is defined as an abnormal shape of the meniscus OR as a high signal intensity unequivocally contacting the surface of the meniscus. The latter must be seen on at least 2 adjacent slices in one plane.