Kristine A. Karlson, MD Dartmouth Medical School Community and Family Medicine/ Orthopaedics Knee Examination in Context: Some Anatomy and History.

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Presentation transcript:

Kristine A. Karlson, MD Dartmouth Medical School Community and Family Medicine/ Orthopaedics Knee Examination in Context: Some Anatomy and History

1.Recognize key elements of knee injury history and their relation to the physical exam. 2.Describe common pathologies of knee injuries seen in the outpatient setting and their hallmark physical exam findings. 3.Perform a focused knee exam. Objectives

Very common cause for office visits Overuse vs acute injury mechanism Either could present to the primary care office Sports/occupational/ accidental mechanisms So let’s talk about the context first (anatomy, history), and some common approaches to treatment, then go on to the physical exam Knee Pain in Primary Care

A 23 y.o. softball catcher in a recreational league began to notice bilateral anterior knee pain early in the season. She has not injured her knees that she can recall, but several times they nearly gave way. Her pain is worse on long car rides and after playing. There is only occasional mild swelling. Case what’s your diagnosis?

■ A common overuse sports injury in women ■ Very common reason for non-injury knee pain visits ■ Characterized by anterior knee pain ■ Patellar subluxation possible (don’t be fooled) ■ History alone often diagnostic ■ If you’re good at only one thing about the knee history, this should be it Patellofemoral Pain

■ wider pelvis ■ femoral anteversion ■ increased Q angle ■ pronation ■ hypermobile joints ■ relative quad weakness ■ known as the miserable malalignment syndrome, look for all this in your physical Female predisposition to patellofemoral pain

■ Bilateral (or not), anterior ■ Atraumatic ■ Movie goer sign (pain with sitting, bent knee) ■ Change in usual routine ■ Repetitive flexion and extension ■ May involve subluxation, don’t be fooled History - Patellofemoral

Valgus collapse with pop Medial pain Little to no swelling (KEY finding) Sense of medial instability Dislike of full extension Dislike of knees touching each other, rolling over in bed History – MCL Tear

Valgus collapse +/- pop Swelling within 24 hrs, often not immediate Locking (truly stuck not transient, brief) Instability or sense of instability History – Medial Meniscus Tear

Dramatic injury Immediate swelling Unable to bear weight (accompanying bone injury) Unable to get to full extension when evaluated later History – ACL Tear

The great mimic Valgus collapse Immediate swelling Inability to bear weight If you’re lucky, they saw the patella dislocated If you’re not, you may be fooled (physical exam really does matter) History – Patellar Subluxation/ Dislocation

■ observe for miserable malalignment ■ observe gait for pronation ■ usually no effusion ■ patella for mobility, apprehension, tenderness ■ And examine ligaments and menisci too, even if you’re sure it’s patellofemoral Physical Exam - Patellofemoral

Finding a Knee Effusion

Varus/ valgus testing for MCL and LCL Lachman’s for ACL Please forget about anterior drawer, low sensitivity/ specificity Physical Exam - Ligaments

Full extension standing – do they get there? Squat Bounce in full extension Palpation of joint line McMurray’s Apley’s Physical Exam - Menisci

■ plain x-ray 3 or 4 views - AP, lateral, Merchants, notch ■ May not do them all every time, may do none (ie patellofemoral w/o trauma) ■ MRI if suspicious for meniscus, ACL tear, bony injury not seen on plain films ■ ultrasound can evaluate patellar tendon Studies

■ ice, NSAID ■ active rest/modify activities ■ bracing and taping, orthotics ■ Quadriceps and hip strengthening (refer to PT, not office handout sheets) ■ Reassurance to patient/ parent that this will not lead to arthritis or disability – pain and harm are not the same Treatment - Patellofemoral

 Depends on your comfort level with your exam, patient’s short and long term goals, cost considerations, other injuries, etc  In other words “it’s complicated” Treatment – All Others

Observe standing ROM, pronation Sit, crepitus, J tracking Lie down, effusion and patellar pain/ mobility MCL, LCL Lachman’s for ACL Palpate joint line, bounce in full extension for meniscus McMurray’s for meniscus Physical Exam in Brief