Meniscal Injury
Lower LimbOverview
Meniscal injuries are common knee conditions involving tear or degeneration of the fibrocartilage menisci, occurring through acute traumatic mechanisms or chronic degenerative processes. These injuries can significantly impair knee stability and mobility, leading to pain, swelling, and functional limitation. Early recognition and appropriate management are essential to prevent secondary osteoarthritic changes.
Pathophysiology
The menisci are C-shaped fibrocartilage structures that act as shock absorbers and load distributors within the knee joint. Acute injuries typically result from combined flexion-rotation mechanisms (commonly twisting on a planted foot), while degenerative tears occur due to cumulative microtrauma and age-related changes in tissue quality. Meniscal tears disrupt the normal load distribution, increase abnormal shear forces on articular cartilage, and can cause mechanical symptoms such as locking or catching. The medial meniscus is more frequently injured than the lateral meniscus due to its firm peripheral attachments limiting mobility during rotation.
Typical Presentation
Site
Knee joint, typically medial or lateral joint line; pain may be localized to the affected meniscus or diffuse across the knee
Quality
Sharp, catching, or stabbing pain with mechanical symptoms; may feel like knee 'giving way' or locking; aching quality with degenerative tears
Intensity
Variable from mild to severe; acute traumatic injuries often present with significant acute pain; degenerative tears may present with intermittent mild-to-moderate pain
Aggravating
Deep flexion activities (squatting, lunging), rotational movements, weight-bearing on flexed knee, prolonged walking, ascending/descending stairs, twisting or pivoting motions
Relieving
Rest, ice application, knee extension, reduced weight-bearing, anti-inflammatory medication, compression
Associated
Joint swelling (effusion), stiffness particularly after rest, reduced range of motion, sensation of instability, crepitus, positive McMurray test, positive Thessaly test, possible knee buckling or giving way
Orthopaedic Tests
Lachman Test (for concurrent ACL assessment)
Procedure
Patient supine, examiner stabilizes femur with one hand and applies gentle anterior translation to proximal tibia at 30° knee flexion
Positive Finding
Increased anterior tibial translation (>5mm difference compared to contralateral knee) or absent end-feel
Sensitivity / Specificity
Reference: Benjaminse A et al., J Orthop Sports Phys Ther 2006; PMID 16715828
Interpretation
Identifies ACL insufficiency, which commonly coexists with meniscal tears; essential for comprehensive knee assessment Note: the Lachman test assesses anterior cruciate ligament integrity; its figures derive from ACL-rupture populations (Benjaminse 2006) and it appears here only to screen for a concomitant ACL injury, not a meniscal tear itself.
Thessaly Test
Procedure
Patient stands on one leg at 20° and 90° knee flexion, internally and externally rotating the body (knee remains fixed) 3 times each. Test is performed on both knees.
Positive Finding
Reproduction of joint line pain or catching/locking sensation, particularly at 20° flexion
Sensitivity / Specificity
Reference: Smith BE et al., Evid Based Med 2015; PMID 25724195
Interpretation
Thessaly test at 20° of knee flexion for meniscal tears: pooled sensitivity 75%, specificity 87% (Smith 2015 meta-analysis). The previously shown 94%/96% were the diagnostic-ACCURACY figures from Karachalios 2005 (JBJS Am, not "Arthroscopy") mislabelled as a sensitivity/specificity pair; that single-centre study is widely regarded as spectrum-biased, so the pooled meta estimate is used.
MRI (Magnetic Resonance Imaging)
Procedure
Standard knee MRI protocol (T1/T2 weighted sequences); assess menisci for signal changes, tears, and displaced fragments
Positive Finding
Intra-substance signal abnormality, meniscal tear lines, or displaced meniscal fragments on imaging
Sensitivity / Specificity
Reference: Phelan N et al., Knee Surg Sports Traumatol Arthrosc 2016; PMID 26614425
Interpretation
MRI against arthroscopy for medial meniscal tears: pooled sensitivity 89%, specificity 88% (Phelan 2016 meta-analysis, KSSTA); lateral meniscal tears 78%/95%. MRI is the imaging reference standard short of arthroscopy.
McMurray's Test
Procedure
Patient supine; examiner flexes the knee fully, then externally rotates the tibia while extending the knee. Repeat with internal rotation. A positive test produces a audible or palpable click or clunk.
Positive Finding
Audible or palpable click/clunk during knee extension, often accompanied by pain or catching sensation
Sensitivity / Specificity
Reference: Smith BE et al., Evid Based Med 2015; PMID 25724195
Interpretation
McMurray's test for meniscal tears: pooled sensitivity 61%, specificity 84% (Smith 2015 meta-analysis, BMJ Evid Based Med). Methodological quality of the pooled studies was poor; interpret alongside history and other findings. (The previously shown 58%/95% was attributed to the fabricated 'Hegedus 2015 BJSM' citation.)
Joint Line Tenderness
Procedure
Palpate along the medial and lateral joint lines of the knee with the knee flexed 90°. Document exact location and reproduction of pain.
Positive Finding
Localized tenderness directly over the joint line (medial or lateral), particularly if pain is reproducible and focal
Sensitivity / Specificity
Reference: Smith BE et al., Evid Based Med 2015; PMID 25724195
Interpretation
Joint line tenderness for meniscal tears: pooled sensitivity 83%, specificity 83% (Smith 2015 meta-analysis). Low evidence quality. (The previously shown 70%/72% was attributed to the fabricated "Hegedus 2015 BJSM" citation.)
Ege's Test
Procedure
Patient in supine, hip 45° flexed, knee 90° flexed. Examiner internally rotates tibia passively with progressive knee extension while palpating joint line
Positive Finding
Reproduction of pain, clicking, or catching, particularly during terminal extension
Interpretation
Good specificity for meniscal pathology; useful adjunct to clinical examination, especially for posterior horn tears Ege's test (weight-bearing McMurray) has limited independent validation and was not included in the Smith 2015 pooled meta-analysis; the figures previously shown are not traceable to a confirmed diagnostic-accuracy source.
⚠ Red Flags
- •Signs of acute ligamentous instability (positive Lachman or anterior drawer tests suggesting ACL injury)
- •Severe acute swelling suggesting hemarthrosis or significant inflammatory response
- •Locked knee that cannot be passively extended, suggesting mechanical block
- •Significant trauma with multi-ligamentous injury pattern
- •Signs of infection (warmth, erythema, fever) suggesting septic joint
- •Chronic symptoms with progressive functional deterioration despite conservative management
- •Neurovascular compromise (diminished pulses, sensation changes, motor weakness)
⚡ Yellow Flags
- •High kinesiophobia or fear-avoidance beliefs limiting rehabilitation engagement
- •Catastrophizing about knee function and prognosis
- •Significant mood disturbance or depression related to functional limitations
- •Excessive reliance on healthcare provider reassurance
- •Workplace or sport-specific distress affecting coping
- •Previous unsuccessful treatment experiences creating negative expectations
- •Social isolation due to activity limitation
Osteopathic Techniques
Region
Knee joint capsule and synovial membrane
Technique
Rationale
Gentle soft tissue mobilization to surrounding musculature (quadriceps, hamstrings, gastrocnemius) reduces muscular guarding, decreases joint effusion through improved lymphatic drainage, and restores normal knee mechanics while managing pain and inflammation in acute phases
Region
Tibiofemoral joint
Technique
Rationale
Gentle, controlled articulation through pain-free ranges promotes synovial fluid distribution, maintains joint proprioception, and prevents stiffness without excessive mechanical stress on the damaged meniscus; particularly valuable during early rehabilitation
Region
Patellofemoral joint and patellar tracking
Technique
Rationale
Optimizing patellar position and tracking reduces abnormal compressive forces through the tibiofemoral joint and improves lower limb biomechanics, reducing compensatory stress on the injured meniscus during rehabilitation
Region
Calf and foot
Technique
Rationale
Releasing plantaris, gastrocnemius, and soleus restrictions improves ankle dorsiflexion and proprioceptive feedback, optimizing shock absorption during weight-bearing activities and reducing compensatory knee mechanics
Region
Lateral structures: IT band, vastus lateralis, fibularis muscles
Technique
Rationale
In lateral meniscal injuries, releasing lateral knee structures and IT band tension reduces excessive lateral compartment compression and normalizes the force distribution across the meniscus during rehabilitation
Add-On Approaches
Chinese Medicine
TCM diagnosis may classify as 'Damp-Heat obstructing the meridians' or 'Qi and Blood stagnation in the knee.' Acupuncture points such as ST34 (Liangqiu), ST35 (Dubi), and EX-LE4 (Neixiyan) may support pain management and promote circulation around the injured meniscus.
Chiropractic
Knee joint manipulation and adjustments to restore normal tibiofemoral and patellofemoral mechanics; attention to sacroiliac and lumbar spine alignment to optimize lower limb kinetic chain function and reduce aberrant knee loading patterns.
Physiotherapy
Progressive strengthening of quadriceps (especially VMO), hamstrings, and hip abductors/external rotators; proprioceptive training, balance work, and closed-chain exercises; graduated return to activity protocol based on tissue healing stages; may include patellar taping to optimize tracking.
Remedial Massage
Deep tissue massage to address myofascial restrictions in quadriceps, hamstrings, gastrocnemius, and hip musculature; trigger point therapy; soft tissue mobilization to reduce protective muscle guarding and improve local circulation and lymphatic drainage in the acute phase
Rehabilitation Exercises
Seated knee flexion-extension (active-assisted)
Supine heel slides with towel on low-friction surface
Quadriceps stretching (standing or supine)
Hamstring stretching (supine, using strap or towel)
Gastrocnemius and soleus calf stretching
Quadriceps sets with vastus medialis obliquus (VMO) focus (isometric)
Glute bridges (bilateral, progressing to single-leg)
Side-lying hip abduction for gluteus medius
Clamshells for hip external rotators
Step-ups onto low platform (4-6 inches)
Single-leg stance on stable surface, progressing to eyes closed
Tandem stance and tandem walking for proprioceptive training
Referral Criteria
- •MRI or imaging findings confirming complex meniscal tear anatomy or extensive degenerative changes requiring surgical evaluation
- •Persistent mechanical locking that does not resolve with conservative management, suggesting free fragment or unstable tear
- •Failure to improve after 6-8 weeks of appropriate conservative care and structured rehabilitation
- •Development of significant knee instability or repeated 'giving way' episodes suggesting associated ligamentous injury (ACL/MCL/PCL)
- •Progressive functional deterioration or loss of range of motion despite compliance with rehabilitation
- •Symptoms consistent with concurrent osteoarthritis requiring rheumatology or orthopedic specialist input
- •Suspected associated injuries (osteochondral lesion, significant effusion, ligamentous damage) identified through clinical testing or imaging
- •Patient goals requiring early return to high-level sport or work, potentially benefiting from surgical consultation
- •Signs of complex regional pain syndrome or chronic pain presentations requiring multidisciplinary pain management
- •Diagnostic uncertainty after thorough clinical assessment