Phase Overview: Weeks 2-6
What This Phase Looks Like
Weeks 2-6 represent a transition period:
- Physical progress becomes visible: Walking improves, range of motion increases, strength begins returning
- Mental health often worsens: Depression peaks around weeks 3-5 for many patients
- Routine establishes: PT appointments, home exercise programs, work/school return
- Impatience grows: Progress feels slow; the long road ahead becomes clear
- Social challenges: Others move on while you're still limited
Primary Focus Areas
- Full range of motion: Achieving full extension and flexion is critical
- Gait normalization: Walking without crutches with normal pattern
- Quad strength: Building strength while protecting graft
- Swelling management: Learning to manage inflammation
- Psychological support: Addressing the mental health challenges of this phase
The depression paradox: Many patients experience worsening mood during weeks 3-5 even as physical progress improves. This is normal. The acute phase is over, the long grind is beginning, and the reality sets in. You are not alone in this.
Goals & Milestones (Weeks 2-6)
Target milestones. Progress varies; don't compare yourself to others.
Week 3 Goals
- Off opioid pain medications
- Walking with 1 crutch or none (protocol dependent)
- Knee extension 0° (full)
- Knee flexion 120°+
- Able to perform SLR easily
- Minimal swelling with activity
- Sleeping through most nights
Week 6 Goals
- Walking without crutches, normal gait
- Full range of motion (0-135°+)
- Good quad strength and control
- Minimal to no limp
- Single leg balance 30+ seconds
- Able to climb stairs normally
- Minimal swelling, well-controlled
- Off all pain medications (OTC as needed only)
The Most Critical Milestone: Full Extension
Achieving and maintaining 0° extension (fully straight knee) is THE most important goal of early recovery.
Why it matters:
- Loss of extension (flexion contracture) is one of the worst complications
- Leads to abnormal gait patterns
- Causes patellofemoral pain
- Difficult to correct if it becomes chronic
- Prevents full return to sport
⚠️ If you cannot fully straighten your knee to match your other leg, this is a problem. Contact your PT and surgeon immediately. This requires aggressive intervention.
Range of Motion Work
Extension Work (Priority #1)
Prone hangs:
- Lie on stomach, legs hanging off bed/table from knee down
- Let gravity pull knee into extension
- Duration: 10-15 minutes, 3-5x daily
- Can add ankle weight for overpressure if cleared by PT
Heel props:
- Heel on elevated surface, nothing under knee
- Let knee relax into extension
- Can add weight on thigh for overpressure
- Duration: 10-15 minutes, frequently throughout day
Extension stretches:
- Seated, heel on floor or elevated surface
- Gentle pressure on thigh above knee
- Hold 30-60 seconds, multiple reps
Flexion Work
Heel slides:
- Continue from early phase
- Use towel or strap to assist if needed
- Goal: 135° by week 6
Sitting knee flexion:
- Seated, use other leg to push surgical knee into flexion
- Gentle pressure, hold 30 seconds
- 3 sets of 10, 3x daily
Wall slides:
- Lie on back, feet on wall
- Slide feet down wall to increase knee bend
- Hold at end range 20-30 seconds
Stationary bike (when cleared, usually week 2-3):
- Start with seat high to reduce flexion requirement
- Just work on making full revolutions initially
- Lower seat gradually as flexion improves
- No resistance early; this is for ROM, not strength yet
Swelling interferes with ROM: If you're struggling to gain ROM, focus on swelling control (ice, elevation, compression). You can't bend a swollen knee. Manage inflammation first.
Strength & Control Exercises
Progressing from basic exercises to building foundational strength. Follow PT guidance on timing and progressions.
Continuing from Weeks 0-2
- Quad sets: Continue, add longer holds (10-30 seconds)
- Straight leg raises: Progress to 4 directions (flexion, abduction, adduction, extension), add ankle weights when easy
- Ankle pumps: Less critical now but maintain circulation
New Exercises (Typically Weeks 2-4)
Short arc quads (SAQ):
- Bolster under knee, straighten leg lifting heel off table
- Excellent for quad strengthening with graft protection
- 3 sets of 15, 2-3x daily
Quad sets with biofeedback:
- Using e-stim, pressure biofeedback, or blood pressure cuff
- Helps establish better neural connection
Glute bridges:
- On back, knees bent, lift hips
- Critical for hip strength
- 3 sets of 15
Clamshells:
- Side-lying, knees bent, lift top knee
- Hip abductor strengthening
- 3 sets of 15 each side
Standing hip abduction/extension:
- Standing, lift leg to side or back
- Use support for balance
- 3 sets of 15
Advanced Exercises (Typically Weeks 4-6)
Mini squats (partial squats):
- Usually started weeks 3-4, some protocols later
- Limited range (0-45° initially)
- Focus on form: knee tracking over toes, weight through heel
- 3 sets of 10-15
Wall sits:
- Back against wall, slide down to partial squat
- Hold 20-30 seconds, build to 60+ seconds
- 3 sets
Step-ups (small step initially):
- 4-inch step initially, progress height
- Surgical leg stepping up
- 3 sets of 10-15
Leg press (when cleared):
- Some protocols week 4-6
- Limited range, light weight
- Focus on quad engagement
Balance work:
- Single leg stance (surgical leg)
- Start with eyes open, support nearby
- Progress to eyes closed, unstable surface
- Goal: 30+ seconds by week 6
Exercise caution: Avoid open-chain knee extension (leg extension machine) in early recovery—places high stress on graft. No running, jumping, cutting, or pivoting yet—not for many months.
Walking & Gait Normalization
Weaning Off Crutches
Typical progression (varies by protocol):
- Weeks 2-3: Two crutches → one crutch → no crutches (some protocols earlier)
- Criteria for progression: Adequate quad control, minimal pain, minimal limp, surgeon/PT clearance
- Don't rush: Walking with bad gait pattern is worse than using crutches longer
Normal Gait Pattern
What you're working toward:
- Equal step length both legs
- Heel strike to toe-off progression
- Knee straightens at heel strike
- Smooth weight transfer
- No compensatory movements (hip hiking, trunk lean)
Common gait problems in this phase:
- Quadriceps avoidance gait: Keeping knee slightly bent due to weak quads—leads to extension loss
- Antalgic gait: Shortened stance on surgical leg due to pain—work on pain management
- Hip hiking: Lifting hip to swing leg through—indicates weak hip and quad
Gait Training Exercises
- Mirror walking: Walk slowly in front of mirror, focus on symmetry
- Heel-toe walking: Exaggerate heel strike and push-off
- Backwards walking: Excellent for quad activation
- Treadmill walking: Enforces steady pace, work on form (when cleared, usually weeks 4-6)
Bad gait patterns become habits: It's better to use crutches longer and walk correctly than to ditch crutches early and develop compensatory patterns that persist for months.