Total Knee Replacement Rehab Protocol: An Evidence-Based, Phase-by-Phase Guide

✓ DPT-Verified Guide

Dr. Joe Armeli, DPT

Written and medically reviewed by Dr. Joe Armeli, DPT · Medically reviewed September 27, 2026 · Last updated September 27, 2026

A phase-by-phase total knee replacement rehab protocol for physical therapists: goals, interventions, dosing, function-based criteria to progress, and when to escalate, built on the 2026 APTA CPG. There's a printable patient handout below, and a clinician PDF for your files.

Physical therapist guiding a man through a heel slide on a slide board in an outpatient clinic, part of a total knee replacement rehab protocol

This protocol is a guide, not a prescription. The surgeon's protocol and precautions always take precedence.

Key Points

Extension first. Prolonged extension work starts on day 1 and carries the highest early priority. An early extension deficit is the validated red flag (Ritter et al, 2007); slow early flexion is not (Richter et al, 2023).
No CPM. The 2026 CPG recommends against it after primary, uncomplicated TKA (high/strong), and recommends passive, active-assistive and active ROM exercise (moderate/moderate).
Progressive strength and motor function training are the two strong "do" recommendations for the post-acute phases, alongside the strong recommendation against CPM.
Progress on function, not the calendar. No study has compared progression criteria, so the gates below are function-first, with ROM secondary.
Measure it. KOOS JR plus 30-Second Sit-to-Stand and TUG at the first visit and discharge from each setting (2020 APTA CPG, consensus/best practice).

The Protocol at a Glance

Phase	Main goals	Advance when (function first)
1 · Days 0–14	Extension within 10° and improving · 70–90° flexion · safe walker mobility · swelling and quad control	Independent transfers · household walking with a walker · SLR unassisted
2 · Weeks 2–6	Full extension · 90° in weeks 2–4 · 100–115° by week 6 · progressive loading	Sit-to-stand without hands · car transfers (~wk 5) · stairs step over step (~wk 6) · walking without a device (~wk 6, progression decided with the PT) · full bike revolutions
3 · Weeks 6–12	110° by weeks 6–8 · 115–120° by week 12 · strength and endurance	Daily activities comfortable · full-day endurance · community walking
4 · Months 3–6	115–125° · return to low-impact activity · kneeling	Working on kneeling · low-impact activity with clearance
5 · Months 6–12	Settle around 117–122° · independent home program	Functional goals met

Knee bend chart after knee replacement showing 90, 100, 110, 120 and 130 degree knee bends in a seated side view

What the ROM targets look like: 90° to 130° of knee flexion, seated side view.

At every gate, soreness and swelling should settle by the next session. That symptom check echoes the criteria Bade et al (2017) used to progress exercise intensity (soreness, pain, ROM, swelling, self-reported function); the functional gates are our clinical criteria. The 2026 CPG notes that no study has yet compared progression criteria directly.

What the Evidence Says: The 2026 APTA Guideline

The 2026 APTA CPG (Bove et al, Phys Ther 2026) revised the 2020 APTA CPG. Its postoperative action statements most relevant to this protocol, with evidence quality and recommendation strength:

Topic	Recommendation	Evidence / strength
Timing	PT, including early mobilization, should start within 24 hours of surgery.	moderate / moderate
CPM	Should not use continuous passive motion after primary, uncomplicated TKA.	high / strong
Bracing	Should not routinely use bracing or splinting early to increase ROM.	moderate / moderate
ROM exercise	Include passive, active-assistive and active ROM exercise.	moderate / moderate
Device-assisted ROM	May use manual therapy with exercise and/or devices to augment active-assistive exercise early.	moderate / weak
Cryotherapy	Teach and encourage cryotherapy for early postoperative pain.	moderate / moderate
Other pain options	May use TENS, Kinesio taping, manual therapy or psychologically informed care.	moderate / weak
Swelling	Cryotherapy plus limb elevation with the knee in 30–90° of flexion early after surgery.	high / moderate
Activity	Encourage early activity with a plan to progressively increase it.	moderate / moderate
Motor function	Include motor function training: dynamic balance, computer- or app-assisted gait retraining, movement training with feedback.	high / strong
NMES	Quadriceps NMES at least daily, started early, at the highest tolerable intensity.	moderate / moderate
Strength	Progressive strength training beginning in the early post-acute period.	high / strong
Delivery	Supervised PT; setting determined by patient safety, mobility, and environmental and personal factors.	moderate / moderate
Digital tools	Consider digital health tools alongside or instead of in-clinic care.	high / moderate

Where this protocol differs: elevation"The CPG pairs cryotherapy with elevating the limb in 30–90° of knee flexion to limit early swelling. In this protocol the leg is elevated straight: the whole leg supported, or support under the ankle, and never a pillow under the knee. Extension is the number one early priority, and an early extension deficit predicts a worse result, so I don't want the knee resting bent. The CPG's reported benefit of flexed elevation is within the first 72 hours." (Ritter et al, 2007; Mitsuyasu et al, 2011)— Dr. Joe Armeli, DPT

Phase 1 · Days 0–14: Hospital and Early Home

Protect, calm the knee, get it straight, get moving.

Goals

Extension within 10° of straight and improving daily; full extension is the target around week 2
Flexion roughly 70–90° by the end of week 2 (in one weekly-goniometry cohort, median flexion was about 80° in week 1: Kornuijt et al, 2019)
Safe mobility with a walker; independent bed, chair and toilet transfers
Swelling control and quadriceps activation

Interventions

Prolonged extension first. Heel propped with nothing under the knee: 3–5 min per session early, building to 10–15 min as tolerated, 2–3×/day. Extension carries the highest priority of the day-1 set.
Heel slides (AAROM): 3 sets × 10, 3–5 s hold at end range, 2–4×/day, in bed or on the couch. A slide board or strap is one way to deliver the active-assistive work (2026 CPG: may use devices to augment active-assistive exercise; moderate/weak). The CPG's slide-board trial found no ROM advantage over standard care; it notes device-assisted approaches "may support patient comfort and engagement."
Quad sets and ankle pumps from day 1; SLR joins in weeks 1–2; stationary bike starts as rocking/partial revolutions in weeks 1–2.
Activity dose: ankle pumps hourly while awake plus a ~5-minute walk every waking hour.
NMES: if the quad is struggling (quad lag, poor voluntary activation), use it. The 2026 CPG recommends quadriceps NMES at least daily, started early, at the highest tolerable intensity (moderate/moderate).
Cryotherapy: ~20 min every 2 hours in weeks 1–2, plus 15–20 min after each exercise session.
Dosing for SLR, quad sets and the bike: per clinician. Start slow and build up.

Heel prop in bed after knee replacement: heel on a rolled towel with nothing under the knee — Prolonged extension: heel propped, nothing under the knee

Heel slides in bed after knee replacement with a low-friction slide board — Heel slides (AAROM) in bed

Quad set in bed: back of the knee pressed down with the thigh tightened — Quad sets

Straight leg raise in bed with the surgical leg locked straight — SLR, joining in weeks 1–2

Precautions

Pain rule, weeks 0–2: discomfort is expected with essentially any movement; sharp, electric or stabbing pain means stop. Do not stop exercise for "increasing pain" alone at this stage.
Elevation: support the whole leg straight (or support under the ankle). Never a pillow under the knee alone and never elevation in flexion. See the note on the CPG above.
Surface: exercises on the bed or couch until floor transfers are cleared, typically around 2 months plus PT clearance.

Advance when (function first)

Independent bed, chair and toilet transfers
Household walking distances with the walker
Straight leg raise without assistance
ROM around 70–90° with extension improving
Soreness and swelling settle by the next session

Escalate

Same-day call to the surgeon: fever per the surgeon's instructions (many use 101.5°F / 38.6°C) especially with a hot, swollen knee; calf pain or swelling; incision drainage that increases, turns cloudy or smells, or spreading redness; a sudden loss of motion the patient already had.
Chest pain or shortness of breath: urgent medical evaluation.
Extension deficit of 15° or more that is not improving by week 2: flag to the surgeon early. Early extension deficit, not early flexion lag, is the validated red flag.

Phase 2 · Weeks 2–6: Building the Foundation

Full extension, 90° and beyond, and progressive loading.

Goals

Full extension (0°) by weeks 2–4
90° flexion, which most people reach in weeks 2–4
About 100–115° flexion by week 6. In a PT-engaged cohort, 94% reached at least 90° and 58% reached at least 110° by 6 weeks (Benes et al, 2024)
Wean the assistive device and normalize gait (progression decided with the PT)

Interventions

Continue extension work and heel slides (AAROM → AROM); a strap adds end-range assistance.
Progressive strength training from the early post-acute period (2026 CPG, high/strong).
Motor function training: dynamic balance, gait retraining (including computer- or app-assisted), movement training with feedback (2026 CPG, high/strong). Balance work typically starts in weeks 2–4.
Mini squats weeks 2–4; wall squats and step-ups around week 4.
Stationary bike: full revolutions typically become possible around 100–110° of flexion.
Dosing: per clinician. Start slow and build up, guided by soreness, pain, ROM, swelling and function (the approach reported by Bade et al, 2017).

Strap-assisted heel slide with a stretch strap around the foot — Strap-assisted slides for end range

Seated heel slide sliding the foot back beneath a chair — Seated heel slides as flexion passes 90°

Woman walking unassisted down a home hallway after knee replacement, walker against the wall — Walking without a device, usually around week 6

Precautions

Pain rule after week 2: a strong stretch up to 4–5 points above baseline (0–10) is acceptable if it settles before the next session. Sharp, electric or stabbing pain means back off.
Ice after week 2 is for comfort; more is fine if it helps.

Advance when (function first)

Sit-to-stand from a normal-height chair without using the hands (~95°)
In and out of a car as a passenger (usually around week 5)
Stairs step over step (usually around week 6; driven by quad strength and pain, not ROM, which needs only ~80–90°)
Walking without a device (usually around week 6, progression decided with the PT)
Full revolutions on the stationary bike
ROM around 100–115° with extension at 0°
Soreness and swelling settle by the next session

Escalate

Extension deficit of 10° or more that is not improving at week 4: intensify extension work and make the surgeon aware.
Flexion under 90° at 6 weeks: call the surgeon.
A plateau: a trend that stays flat across 2–3 weeks of consistent daily work is worth a call.

Phase 3 · Weeks 6–12: Gaining Momentum

Strength, endurance and the last big ROM gains.

Goals

About 110° by weeks 6–8 and 115–120° by week 12; 84% of the same cohort reached at least 110° by 12 weeks (Benes et al, 2024)
Extension maintained at 0°
Comfortable daily activities and community-level walking

Interventions

Progress strength and motor function training.
Lunges typically join in weeks 6–8.
Floor-based exercise once floor transfers are cleared (typically around 2 months plus PT clearance).
Gains of 1–2° a week after week 6 are real progress.
Dosing: per clinician. Start slow and build up.

Man lowering himself onto an exercise mat beside a sofa, one hand braced for support — Floor transfers once cleared (typically ~2 months + PT clearance)

Wall heel slide lying on a mat with legs up the wall — Floor-based work such as wall slides, after floor clearance

Advance when (function first)

Daily activities comfortable
Strength and endurance for a full day
Community walking distances
ROM around 110–122°
Soreness and swelling settle by the next session

Escalate

Flexion under 90° at weeks 6–8: call the surgeon now. Manipulation under anesthesia works best inside 12 weeks: early MUA gained 36.5° (final ROM 119°) versus 17° (final 95°) when done after 12 weeks (Issa et al, 2014).
Any extension deficit of 10° or more: make the surgeon aware.
Under 105° with a flat trend at week 12: stiffness workup. ROM under 90° persisting beyond 12 weeks meets the formal stiffness definition, seen in about 4% of TKAs (Tibbo et al, 2019).

Phase 4 · Months 3–6: Returning to Life

Function, confidence and activity.

Goals

About 115–125° (a coached goal of 120–130°)
Extension 0° maintained
Return to chosen low-impact activity

Interventions

Continue progressive strengthening and motor function training.
Kneeling: start working on it around months 3–4. It is uncomfortable, not dangerous; pad it, build up gradually, and confirm implant-specific guidance with the surgeon.
Low-impact activity (swimming, golf) typically weeks 12–16 with surgeon clearance.
Avoid jumping and running.
Flexion gains typically plateau around month 3; extension can keep improving to around month 6 (Mutsuzaki et al, 2017).

What a 120 degree knee bend looks like in a seated side view — What 120° looks like

Advance when (function first)

Working on kneeling
Low-impact activity with surgeon clearance
ROM around 115–125°
Soreness and swelling settle by the next session

Escalate

Extension deficit of 15° or more at month 3: refer to the surgeon. In one series every contracture over 15° at 3 months persisted at 2 years (Mitsuyasu et al, 2011).
Sustained or sudden regression in motion (not a one-day dip after a heavy session): surgeon.

Phase 5 · Months 6–12: Full Recovery

Strength, confidence and a home program that keeps going.

Goals

Typical settle of about 117–122° by 1 year; 125–135° is a best-case ceiling, not the expectation
Extension 0° maintained
Strength, endurance and confidence for the patient's goals

Interventions

The home program is the part that keeps going: typically 3–6 months of continued work beyond formal PT, with small gains still possible out to 12 months.
Final flexion is largely set by pre-operative flexion, so frame the settle point individually (Ritter et al, 2003).

Advance when (function first)

Discharge when the patient's functional goals are met and the home program is independent

Escalate

Flexion under 110° at 6+ months, or progressive stiffening: surgical consult and arthrofibrosis workup.

Outcome Measures

Recommended minimum: the 2020 APTA CPG recommends the KOOS JR (patient-reported) plus the 30-Second Sit-to-Stand and Timed Up and Go (performance), collected at least at the first visit and at the conclusion of care in each setting (consensus, best practice). The 2026 revision explicitly leaves outcome-measure recommendations to a future version.
Optional additions: the OARSI-recommended performance tests (Dobson et al, 2013): the 30-second chair stand, 40 m fast-paced walk and a stair-climb test as the minimal core set, plus TUG and the 6-minute walk test.
Cadence: KOOS JR every 2 weeks during active rehab. Knee angle daily in weeks 0–6, weekly in weeks 6–12, monthly after week 12; the trend over weeks matters more than any single reading.
Home measurement: patients can also track flexion from a side-view photo with the free knee flexion tracker.

Setting and Visit Dose

There is no set number of PT visits; setting and dose are both decided by medical necessity. Going straight to outpatient PT is the typical path, with home health used when it is medically necessary. For outpatient care, most people land around 10 to 15 visits. When home health is used, most episodes run about 2 to 3 weeks and around 6 to 13 visits. In one multi-site US cohort, total visit count was not associated with outcomes, while content and progression were (Oatis et al, 2019).

Patient Handout: Your Home Program After Knee Replacement

Your physical therapist will adjust this for you. Your surgeon's instructions always come first.

For the first two weeks, every waking hour

Ankle pumps: point and flex your feet.
A walk of about five minutes.

Several times a day

Get the knee straight first: prop your heel with nothing under the knee. Start with 3–5 minutes and build to 10–15 minutes, 2–3 times a day.
Heel slides: 3 sets of 10, holding 3–5 seconds at your deepest comfortable bend, 2–4 times a day, in bed or on the couch.
Quad sets and your other exercises: as your PT showed you.

Heel propped on a rolled towel with nothing under the knee — Straighten: heel propped

Heel slides in bed on a slide board — Bend: heel slides

Ankle pumps in bed, one foot pointed and one pulled back — Every hour: ankle pumps

After each session

Ice for 15–20 minutes. Elevate the leg with the whole leg supported and straight, or with support under your ankle. Never a pillow under your knee.

Pain

In the first two weeks, nearly every movement hurts, and that's expected. Sharp, electric or stabbing pain means stop. After two weeks, a strong stretch up to 4–5 points above your usual pain (out of 10) is OK if it settles before your next session.

Measure your bend

Measure it daily for the first six weeks, then weekly to week 12, then monthly. Watch the trend over weeks, not one reading.

Call your surgeon the same day for: a fever (follow your surgeon's instructions; many ask for a call over 101.5°F / 38.6°C), especially with a hot, swollen knee · pain or swelling in your calf · drainage from the incision that increases, turns cloudy or smells, or redness spreading from it. For chest pain or trouble breathing, call your surgeon first; they'll tell you if you need the ER.

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Frequently Asked Questions

What is the rehab protocol after total knee replacement?

Most protocols run in phases: days 0–14 focus on getting the knee straight, early bending, walking with a walker and swelling control; weeks 2–6 build to full extension and 90° and beyond with progressive strengthening; weeks 6–12 build strength, endurance and the last big ROM gains; months 3–12 return the patient to daily life and chosen low-impact activity. Progression is best guided by function, with ROM secondary, rather than by the calendar alone.

How long do you have rehab after total knee replacement?

There is no set number of visits; how much therapy someone gets is based on medical necessity. For outpatient care, most people land somewhere around 10 to 15 visits. When home health is used, most episodes run about two to three weeks and somewhere around 6 to 13 visits. The home program keeps going beyond formal PT, typically for 3 to 6 months.

Is CPM still used after knee replacement?

The 2026 APTA clinical practice guideline recommends that physical therapists not use continuous passive motion after primary, uncomplicated TKA (high-quality evidence, strong recommendation). The CPG recommends passive, active-assistive and active ROM exercise (moderate evidence, moderate recommendation); heel slides are a common active-assistive option.

What outcome measures should be used after TKA?

The 2020 APTA guideline recommends the KOOS JR as the patient-reported measure and the 30-Second Sit-to-Stand and Timed Up and Go as performance measures, collected at least at the first visit and at the end of care in each setting. The 2026 revision leaves outcome-measure recommendations to a future version.

What is the hardest part of knee replacement recovery?

For many patients it is the first week at home: the hard stretch starts when the nerve block or anesthesia wears off and often peaks around days 5 to 7, as pain, poor sleep and fatigue stack up. Clinically, the part most worth fighting for early is full extension, because an early extension deficit predicts a worse result more than slow early flexion does.

What should you avoid after a knee replacement?

Avoid a pillow under the knee (support the whole leg straight instead), avoid jumping and running, and stay on the bed or couch for exercises until your PT clears you for floor transfers. Follow your surgeon's specific precautions.

References

Bove AM et al. Clinical practice guideline for physical therapist management of total knee arthroplasty: revision 2026. Phys Ther. 2026. PMID 42506877
Jette DU et al. Physical Therapist Management of Total Knee Arthroplasty. Phys Ther. 2020. PMID 32542403
Bade MJ et al. Early High-Intensity Versus Low-Intensity Rehabilitation After Total Knee Arthroplasty: A Randomized Controlled Trial. Arthritis Care Res (Hoboken). 2017. PMID 27813347
Dobson F et al. OARSI recommended performance-based tests to assess physical function in people diagnosed with hip or knee osteoarthritis. Osteoarthritis Cartilage. 2013. PMID 23680877
Kornuijt A et al. Recovery of knee range of motion after total knee arthroplasty in the first postoperative weeks: poor recovery can be detected early. Musculoskelet Surg. 2019. PMID 30628029
Richter J et al. [Knee flexion after hospitalisation is no predictor for functional outcome one year after total knee arthroplasty]. Orthopadie (Heidelb). 2023. PMID 36449049
Issa K et al. The effect of timing of manipulation under anesthesia to improve range of motion and functional outcomes following total knee arthroplasty. J Bone Joint Surg Am. 2014. PMID 25143495
Mitsuyasu H et al. Flexion contracture persists if the contracture is more than 15° at 3 months after total knee arthroplasty. J Arthroplasty. 2011. PMID 20541887
Ritter MA et al. The role of flexion contracture on outcomes in primary total knee arthroplasty. J Arthroplasty. 2007. PMID 18078875
Mutsuzaki H et al. Target range of motion for rehabilitation after total knee arthroplasty. J Rural Med. 2017. PMID 28593015
Benes G et al. Optimal Duration of Physical Therapy Following Total Knee Arthroplasty. Geriatr Orthop Surg Rehabil. 2024. PMID 38766277
Tibbo ME et al. Acquired Idiopathic Stiffness After Total Knee Arthroplasty: A Systematic Review and Meta-Analysis. J Bone Joint Surg Am. 2019. PMID 31318813
Oatis CA et al. Characteristics of Usual Physical Therapy Post-Total Knee Replacement and Their Associations With Functional Outcomes. Arthritis Care Res (Hoboken). 2019. PMID 30281207
Ritter MA et al. Predicting range of motion after total knee arthroplasty. Clustering, log-linear regression, and regression tree analysis. J Bone Joint Surg Am. 2003. PMID 12851353

This protocol is for educational purposes for licensed clinicians and does not replace clinical judgment or the operating surgeon's protocol. Patient-facing content is not a substitute for individualized care.