Musculoskeletal · PANCE / PANRE

Meniscus Tear

Written & clinically reviewed by Ryan Busch, PA-C · Updated August 2026 · Report an error

Acute or degenerative tear of the medial or lateral meniscus causing joint-line pain, effusion, and mechanical symptoms.

Also known as: meniscus tear, meniscal tear, medial meniscus, lateral meniscus

Overview

Tear of the fibrocartilaginous meniscus of the knee. Acute tears typically result from a twisting injury on a planted foot in younger active patients. Degenerative tears occur in middle-aged and older adults often with minimal or no recalled trauma and coexisting OA.

Epidemiology

One of the most common knee injuries. Acute tears peak in athletes 20-40. Degenerative tears prevalent in adults >40, especially with knee OA.

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Question 1MusculoskeletalMedium
A 24-year-old recreational soccer player presents with right knee pain that began 3 days ago when she planted her foot and twisted while changing direction, feeling a pop. Since then she has had medial-sided pain and a sensation of catching. On exam she has a moderate effusion, tenderness along the medial joint line, and a positive McMurray test; the Lachman test is negative. Weight-bearing radiographs of the knee show no fracture, normal alignment, and no joint-space narrowing. Which of the following is the most appropriate next diagnostic test to confirm the suspected diagnosis?
  • AKnee ultrasonography
  • BKnee MR arthrography
  • CCT scan of the knee
  • DMRI scan of the knee
Reveal answer & full explanation
Correct answer: D — MRI scan of the knee
  • AKnee ultrasonography
  • BKnee MR arthrography
  • CCT scan of the knee
  • DMRI scan of the knee✓

Why MRI scan of the knee is correct

  • The twisting mechanism on a planted foot, medial joint-line tenderness, mechanical catching, and a positive McMurray test point to a meniscal tear.
  • Normal weight-bearing radiographs have already excluded fracture and significant osteoarthritis but cannot image the fibrocartilaginous meniscus.
  • MRI is the noninvasive gold standard for confirming a meniscal tear and characterizing its morphology (radial, longitudinal, bucket-handle, root) with high sensitivity and specificity, which is why it is the appropriate next study after plain films.

Why the others are wrong

  • CT scan of the knee — Excellent for bony detail and occult fractures but has poor soft-tissue contrast; it does not reliably visualize meniscal cartilage and adds radiation without answering the question.
  • Knee MR arthrography — Intra-articular gadolinium is added to separate recurrent tear from healing granulation tissue in a previously repaired or resected meniscus; in a native knee with a first-time tear it is invasive and adds nothing to conventional MRI.
  • Knee ultrasonography — Can assess some superficial soft tissues and effusions but is operator-dependent and far less sensitive than MRI for the meniscus, so it is not the confirmatory study of choice.
Question 2MusculoskeletalMedium
A 58-year-old man reports 6 weeks of medial right knee pain that began insidiously after gardening. He denies any locking, catching, or giving way, and the knee extends fully. Exam shows medial joint-line tenderness and a small effusion; McMurray reproduces medial joint-line pain. Weight-bearing radiographs show medial joint-space narrowing and small osteophytes. MRI confirms a horizontal degenerative tear of the medial meniscus. Which of the following is the most appropriate initial management?
  • AIntra-articular steroid injection
  • BArthroscopic partial meniscectomy
  • CPhysical therapy and oral NSAIDs
  • DArthroscopic repair of the meniscus
Reveal answer & full explanation
Correct answer: C — Physical therapy and oral NSAIDs
  • AIntra-articular steroid injection
  • BArthroscopic partial meniscectomy
  • CPhysical therapy and oral NSAIDs✓
  • DArthroscopic repair of the meniscus

Why Physical therapy and oral NSAIDs is correct

This is a degenerative horizontal meniscal tear in a 58-year-old with coexisting early osteoarthritis (joint-space narrowing, osteophytes) and NO mechanical symptoms (no locking, catching, or block to extension). Guideline-concordant initial management is conservative: physical therapy (quadriceps/core strengthening, range of motion) plus NSAIDs and activity modification. Multiple high-quality trials (MeTeOR, ESCAPE) show arthroscopy is not superior to PT for degenerative tears with OA.

Why the others are wrong

  • Arthroscopic partial meniscectomy: not superior to physical therapy or sham for degenerative tears with OA, and it can accelerate cartilage loss; it is not first-line here.
  • Arthroscopic repair of the meniscus: reserved for peripheral, vascular (red-red zone) tears in younger patients; a degenerative horizontal tear in an older adult is not repairable.
  • Intra-articular steroid injection: a reasonable adjunct for OA-related pain, but it is not the appropriate initial step over physical therapy and NSAIDs.
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Risk factors

  • Twisting or pivoting sports — basketball, soccer, football, skiing
  • Older age (degenerative tears)
  • Coexisting knee osteoarthritis
  • Obesity
  • Prior knee surgery
  • Discoid meniscus (anatomic variant, lateral > medial)

Pathophysiology

The menisci distribute load and stabilize the knee. A twisting force on the flexed and loaded knee — or repetitive degenerative wear — produces a tear. The peripheral 'red-red' zone (outer 1/3) is vascularized and may heal; the inner 'white-white' zone is avascular and does not heal. Tear morphology (radial, horizontal, longitudinal, complex, bucket-handle, root tear) influences treatment.

Clinical presentation

Symptoms

  • Acute tear: twisting injury, often with a popping sensation, followed by pain along the joint line
  • Effusion developing over 12-24 hours (slower than ACL effusion)
  • Mechanical symptoms: catching, locking, giving way
  • Degenerative tear: insidious medial joint-line pain, may follow squatting or rising from chair, often with coexisting OA symptoms

Signs / physical exam

  • Joint-line tenderness (medial > lateral) — best clinical sign
  • Effusion
  • Positive McMurray test (joint line pain or click with flexion and rotation)
  • Positive Thessaly test (pain with internal/external rotation while standing on the affected leg)
  • Positive Apley grind test (prone, knee flexed 90 degrees, axial compression plus tibial rotation reproduces joint-line pain); pain with deep squatting
  • Reduced flexion or true mechanical block to extension (consider bucket-handle tear)

Differential diagnosis

  • ACL tear — Audible pop, immediate large effusion, instability; positive Lachman; often coexists with meniscus tear (especially lateral)
  • Medial collateral ligament (MCL) sprain — Valgus mechanism; tenderness along medial joint line above and below; pain with valgus stress
  • Patellofemoral pain syndrome — Anterior knee pain with stairs, prolonged sitting; no joint-line tenderness or mechanical symptoms
  • Osteoarthritis — Insidious onset, X-ray findings, often coexists with degenerative meniscal tears
  • Osteochondral lesion — Catching/locking, X-ray or MRI changes
  • Pes anserine bursitis — Tender ~5 cm distal to the medial joint line at the pes anserine insertion
  • Loose body — Episodic locking, joint-line pain, MRI/CT diagnostic
  • Septic arthritis / inflammatory effusion — Warm, erythematous, fever; arthrocentesis

Diagnostic workup

Labs

  • Not indicated unless concern for inflammatory or septic etiology

Imaging

  • Weight-bearing knee X-rays — evaluate for OA, fracture, alignment
  • MRI — gold standard for confirming meniscal tear and characterizing morphology; high sensitivity and specificity
  • Arthroscopy — diagnostic and therapeutic in selected cases

Diagnostic algorithm

FeatureAcute meniscus tearDegenerative meniscus tear
Typical patientAthlete 20-40Adult >40 with OA
MechanismTwisting on planted footInsidious; minor stress
EffusionDevelops over 12-24 hVariable, often small
Mechanical symptomsCommon (locking, catching)Less common
ImagingMRI confirms tearMRI commonly shows tear; correlate clinically
First-line treatmentPT, NSAIDs, often arthroscopyPT, NSAIDs; arthroscopy NOT superior
Surgical indicationLocked knee, repairable tear, refractory symptomsRare — only if true mechanical symptoms
Acute vs degenerative meniscus tears — different patients, different treatment thresholds.

Treatment

First-line

  • Activity modification, avoidance of pivoting and deep squatting
  • RICE (rest, ice, compression, elevation) acutely
  • NSAIDs — ibuprofen, naproxen, meloxicam — for pain and effusion
  • Acetaminophen as adjunct
  • Physical therapy — quadriceps and core strengthening, range of motion
  • Intra-articular corticosteroid injection — useful for degenerative tears with OA features

Complications

  • Progression of knee OA after partial meniscectomy
  • Persistent pain, recurrent effusion, mechanical symptoms
  • Postoperative DVT (low but real)
  • Postoperative infection
  • Retear after repair (especially in white-white zone)
  • Locked knee with unrepaired bucket-handle tear

PANCE pearls

  • Joint-line tenderness is the single most useful exam finding for meniscal tear.
  • Knee that cannot fully extend after a twisting injury is concerning for a bucket-handle tear — urgent orthopedic referral.
  • Arthroscopic partial meniscectomy does not outperform physical therapy or sham for degenerative meniscus tears with OA (MeTeOR, ESCAPE trials) — counsel patients accordingly.
  • Meniscal repair is preferred over meniscectomy whenever the tear is in the vascular zone and the patient is young — preserves cartilage.
  • MRI commonly shows degenerative meniscal tears in asymptomatic older adults — correlate clinically.

References

  • AAOS 2018 — AAOS Clinical Practice Guideline on Management of Osteoarthritis of the Knee (Non-Arthroplasty), 3rd ed. (2021)
  • MeTeOR Trial — Surgery vs Physical Therapy for a Meniscal Tear and Osteoarthritis (Katz et al., NEJM 2013)
  • ESCAPE Trial — Effect of Early Surgery vs PT on Knee Function in Patients with Nonobstructive Meniscal Tears (van de Graaf et al., JAMA 2018)

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Commonly confused with

vs Anterior Cruciate Ligament (ACL) Tear

Related Musculoskeletal diagnoses

Osteoarthritis (OA)Rheumatoid Arthritis (RA)GoutPseudogout (CPPD Disease)Systemic Lupus Erythematosus (SLE)Polymyalgia Rheumatica (PMR)Giant Cell Arteritis (GCA)FibromyalgiaAnkylosing Spondylitis (Axial Spondyloarthritis)Psoriatic Arthritis (PsA)Septic ArthritisOsteomyelitisOsteoporosisAcute Low Back Pain and Lumbar Radiculopathy

Differentials & related conditions

Anterior Cruciate Ligament (ACL) Tear

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