Meniscus Injury

 

What is the meniscus?

There are 2 menisci in the knee, one on the inside (medial) and one on the outside (lateral). They are C shaped structures that act primarily as shock absorbers to prevent damage to the articular cartilage of the knee joint. They have several other roles in the knee including lubrication and resisting abnormal twisting movements.

Meniscus Tears

Meniscus tears are common injuries in the knee and occur in all age groups. 

Symptoms of meniscus tears include;

  • Pain
  • Swelling
    • Reduced range of motion- both bending and straightening
    • Locking- when the meniscus flips into the joint and physically stops the knee from straightening
  • Clicking
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There are 2 types of meniscal tears, traumatic and atraumatic. Traumatic meniscal tears tend to occur when the knee is slightly bent, loaded and a twisting motion or change in direction occurs.  These meniscal tears can occur in isolation or in combination with ligament tears.

Atraumatic or degenerative meniscal tears don’t tend to have a discrete episode leading to injury but are a result of repetitive stress (microtears) on the meniscus with age.  As the meniscus tissue becomes worn out and stiff, tears can occur at any time.  These tears occur in multiple directions and are often not repairable.  Most often, degenerate tears are initially treated without surgery.

Based on the patient age, the type of tear and blood supply to the fragment some meniscus tears are repairable while others are not.  Dr. Cohen tends to favor repair over meniscectomy (removal of damaged meniscus) whenever possible.   Complete removal of the meniscus predisposes the knee to arthritis.  When tears are not repaired, the minimal amount of meniscal tissue is removed.

Meniscal Root Tears

A variant of the meniscal tear is called a meniscal root tear.  This involves partial or complete detachment of the meniscus at one of its anchor points at the front or back of the knee. 

Complete tears of the meniscal root behave like the meniscus is deficient or entirely removed because most of the tension is lost and it cannot function properly. 

Complete meniscal root tears in patients with intact cartilage should be repaired to avoid early arthritis.

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Stage Goals Weight Bearing ROM/Cardio Exercises
Stage 1

Weeks 0-6

Recovery and Non -Weight Bearing Phase

  1. Swelling Control

(rest, ice, compression and elevation)

  1. Range of Motion within prescribed limits 
  2. Quadriceps Activation
  3. Limit Muscle Loss
TTWB

ROM Brace locked in extension when mobilizing

and sleeping

Rom Brace as per prescribed post-op orders

Passive and active assisted Heel Slides 

Patella Mobilizations

Multi Plane SLR 

Multi Plane Hip Range

IRQ

Static quads, hamstrings, calf pumps

Stage 2

Weeks 6-8

Early Weight Bearing and Strength Training

  1. ROM
  2. Gait Re-Training and quads control
  3. Strengthening 
PWB then progress to WBAT

ROM brace 0-90 when mobilizing

ROM brace not required for exercises or at rest

Stationary Bike, no resistance to begin

Treadmill Walking

Re-establish ROM

No deep weight bearing < 90°

**Body Weight Strengthening only 

Half squats, Ball squats

Wall slides

Bridges

Forward lunges to 60°

Stage 3

Weeks 8-16

Strengthening

  1. Enhance Strengthening
  2. Loading > body weight 
WBAT Full ROM

Start Treadmill Walking week 8

Start Elliptical Week 10

Start inline Jogging week 12 – if quads index >80% contralateral limb 

No cutting or pivoting until week 16

Quads, hamstrings, calf strengthening

Hip abductor and adductor strengthening

Squats (to chair if appropriate)

Step downs- front, back and lateral

Lateral Lunges

Romanian Deadlift unloaded from week 8, loaded week 10 

From Week 12 

Single leg squats to 90°

Loaded Squats and Deadlift from week 12

Single limb balance and proprioception

Stage 4

Week 16+

Return to Sport

  1. Integrate Plyometrics
  2. Return to Functional Activty
  3. Agility Training
WBAT Multi-plane plyometrics

Multi-plane Agility

Cutting and Pivoting Exercises

Ladder Drills

Landing Mechanics

Return to Sport Criteria

Single Leg hop

Quads index > 95%

Hamstrings index >95%

Pain and swelling free post exercise

 

General info

  • NWB for 6 weeks after Meniscal Root Repair
  • Posterior Root Repairs will require limited flexion for 4-6 weeks (<90°)
  • Anterior Root Repairs will have extension limited for 2-4 weeks (>10°)
  • No deep flexion weight bearing for 8 weeks
  • Inline running from 12 weeks
  • Pivoting and Cutting from 16 weeks
Stage Goals Weight Bearing ROM Exercises/Cardio Strengthening
Stage 1- 

0-2 Weeks

Recovery from Surgery 

  1. Swelling Control

(rest, ice, compression, and elevation)

  1. Range of Motion 
  2. Quadriceps Activation
  3. Limit Muscle Loss
As tolerated using Crutches Patella Mobilization

Heel slides

Prone Hangs and Heel Props

Gastrocnemius and Hamstrings Stretch

Start Exercise Bike when ROM Allows

IRQ

Static contraction and co-contractions

Calf Raises SLR

Hip Abductors-clamshell and Therabands

Stage 2- 

Weeks 2-4

ROM and provisional strengthening

  1. Full ROM
  2. Regain Quads Control 
  3. Gait Re-training
  4. Start WBAT
  5. Strengthening
As tolerated

Wean Crutches as quads control improves

Exercise Bike

Patella Mobilizations

Prone and Standing Quads Stretch

Hip Flexor Stretch

Hamstring Curls

Step-up

Half Squats, Ball squats

Wall Slides

Bridges on and off ball 

Start Leg Press

Flexed Single limb balance 

Stage 3- Weeks 4-8

Strengthening and cardiovascular training 

  1. Enhance Muscle Strength
  2. Gait Re-training 
  3. Cardiovascular Training
WBAT Elliptical from week 4

Stair Climber from week 4

Pool Jogging from week 6

Inline jogging from week 8

  • If quads index > 80% (relative to contralateral knee)
Quads, hamstrings, calf strengthening

Hip abductor and adductor strengthening

Squats (to chair if appropriate)

Single leg squats

Step downs- front, back and lateral

Lateral Lunges

Single leg deadlift where appropriate

Single limb balance and proprioception

Stage 4-

Weeks 9-12

Return to Sport

  1. Integrate Plyometrics
  2. Return to Functional Activity
  3. Agility Training 
WBAT Multi-plane plyometrics

Multi-plane Agility

Cutting and Pivoting Exercises

Return to Sport Criteria

Single Leg hop

Quads index > 95%

Hamstrings index >95%

Pain and swelling free post exercise

 

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