Knee Injury Rehab Plan: A Phase-by-Phase Guide
A knee injury rehab plan is typically structured in four phases — protection, mobility, strength, and return-to-activity — each with its own goals, exercises, and criteria for progressing to the next stage. The exact plan depends on the diagnosis (ACL reconstruction, meniscus repair, patellofemoral pain) and how the patient responds week to week.
The 4 phases of knee rehab
Phase 1 — Protection & pain control (weeks 0–2): reduce swelling, protect healing tissue, restore basic range of motion.
Phase 2 — Early mobility & strength (weeks 2–6): regain full range of motion, reactivate the quadriceps and hamstrings.
Phase 3 — Progressive strengthening (weeks 6–12): closed-chain loading, balance and proprioception work.
Phase 4 — Return to activity (week 12+): sport-specific drills, plyometrics, and return-to-sport testing.
Sample exercises by phase
Phase 1: quad sets, heel slides, straight-leg raises, ankle pumps for circulation.
Phase 2: stationary cycling, mini squats, terminal knee extensions.
Phase 3: step-ups, leg press, single-leg balance work, resistance band walks.
Phase 4: lateral bounds, cutting drills, sport-simulation circuits, hop testing.
How to know when to progress a patient to the next phase
Progress when range of motion meets the target for that phase, strength reaches an acceptable symmetry percentage compared to the uninvolved leg, and pain or swelling stays low during and after loading.
Rushing progression before these criteria are met is one of the most common causes of setbacks in knee rehab.
Building a knee rehab plan with AI
Rehabence's Rehab Plan Builder takes the diagnosis and current phase and proposes phase-appropriate exercises and progressions from a 3,000+ exercise library.
The therapist reviews, adjusts load and frequency, and prescribes the plan digitally — the patient follows it on their phone, including video demonstrations, with no paperwork on either side.
Frequently asked questions
- Most ACL reconstruction rehab protocols run 6–12 months, with return-to-sport testing typically not cleared until at least 9 months post-surgery, depending on graft type and recovery progress.
- No. Meniscus repairs usually require more caution with weight-bearing and deep flexion early on, while ACL reconstruction protocols focus heavily on quadriceps reactivation. Rehabence's plan builder adjusts exercise selection based on the specific diagnosis.
- Common criteria include at least 90% limb symmetry index on strength and hop testing, full pain-free range of motion, and successful completion of sport-specific movement screening.
- Yes. Every rehab plan built in Rehabence can be shared with the patient as a mobile-friendly home exercise program with instructions and video demonstrations for each exercise.
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