ACL Surgery Recovery Week by Week: What to Expect Every Step of the Way

After an ACL reconstruction, most patients want something more practical than a phase chart. They want to know what is happening this week, whether their swelling is “normal,” when the brace can finally come off, and whether they are on track. A phase-based timeline answers those questions in 6- to 12-week chunks. A week-by-week view answers them as they actually arrive.

The broader ACL recovery timeline groups the journey into six clinical phases. This page zooms in. Dr. Burnham and the team at the Ochsner-Andrews Sports Medicine Institute use an objective milestone framework in the ACL Center of Excellence: Limb Symmetry Index (LSI) thresholds of 70% at three months, 85% at six months, and 95% at nine months, paired with a full return-to-sport testing battery before any cutting or pivoting sport. What follows is a realistic week-by-week view of that pathway, grounded in Dr. Burnham’s published research and the evidence-based rehabilitation guidelines most modern sports medicine teams follow.

Two caveats before the breakdown. First, every recovery varies. Graft choice, whether a meniscus was repaired alongside the ACL, prior strength, sex, and age all shift these milestones by days or weeks. Second, the calendar does not release a patient back to sport; the testing does. A nine-month date alone is not clearance. Objective strength, hop performance, and psychological readiness are what determine readiness.

Corinna Coffin’s Week-by-Week Recovery

Corinna Coffin, an adult recreational athlete, documented her ACL reconstruction and recovery in a detailed week-by-week narrative. Her experience captures both the physical milestones and the emotional arc that most patients go through.

Before Surgery , Prehabilitation (Two to Four Weeks Pre-Op)

The first week of recovery is written in the two weeks before surgery. Patients who enter the operating room with full knee extension, good flexion, and an already-activated quadriceps lose less ground in the first post-operative week and regain it faster. Published evidence-based rehabilitation guidelines, including the widely cited practice guideline from van Melick and colleagues, recommend prehabilitation focused on quadriceps strength, range of motion, and neuromuscular control.

Typical prehab goals before ACL reconstruction:

• Full knee extension (0°) and at least 120° of flexion
• Quadriceps strength Limb Symmetry Index (LSI) of 80% or higher on the surgical side
• Minimal effusion
• Comfortable ambulation without a limp

Common prehab exercises:

• Quad sets and straight-leg raises to reawaken the quadriceps
• Stationary bike at low resistance to maintain flexion
• Mini-squats and step-ups for closed-chain control
• Hip abduction and external rotation work, a point Dr. Burnham’s 2026 International Journal of Sports Physical Therapy review emphasizes as a core assessment domain, since hip external rotation strength independently predicts post-operative hop performance

Logistics worth handling before the day of surgery:

• An ice machine or reliable cryotherapy plan (critical for the first two weeks)
• A hinged knee brace, fitted before surgery
• Crutches and a plan for bathroom and stairs
• Bed positioning: a rolled towel under the heel keeps the knee in full extension while sleeping
• A ride home. No driving for at least the first week, longer for right-leg surgery

Week 1: Immediately Post-Op (Days 0-7)

Primary goals: control pain and swelling, protect the graft, regain full extension, start quadriceps activation.

The first week is the week of greatest discomfort and the week of highest strategic importance. Swelling, pain, and protection of the graft dominate. At the same time, the single most important range-of-motion milestone of the entire recovery, full passive knee extension, needs to be reached by day seven. Failure to regain full extension early is strongly associated with persistent stiffness and poorer long-term outcomes, which is why surgeons are aggressive about it.

What most patients feel

• Pain peaks days 2 through 4, then steadily declines
• Significant swelling and bruising, sometimes tracking down the shin
• Tightness and a “foreign” feeling in the knee
• Fatigue as the body begins healing
• Disrupted sleep in the first few nights

Key benchmarks to hit by end of week 1

• Full passive extension , the back of the knee touches the bed
• Flexion to approximately 90°
• Visible quadriceps contraction during a quad set
• Swelling controlled enough that the brace can be secured without pinching

Weight-bearing and brace (isolated ACL reconstruction)

• Weight bearing as tolerated; crutches are used for balance and confidence, not because of any weight-bearing restriction. Some patients discontinue crutches within the first week once gait is smooth and the quadriceps is firing reliably.
• Brace locked at 0° extension for ambulation only (it is never locked for sleep)
• Brace worn unlocked during sleep in week 1; discontinued for sleep after week 1
• Brace removed for physical therapy sessions and prescribed exercises throughout the entire recovery
• The brace transitions to unlocked for walking once the patient can ambulate without a limp and quadriceps function has returned adequately, which is typically within the first few weeks but varies by patient

If a meniscus was repaired at the same time

• Weight bearing may be limited or non-weight bearing for up to four to six weeks, depending on the type and location of the meniscus repair
• Range of motion may be restricted to 90° of flexion for up to four weeks to protect the meniscus repair
• Crutches are used longer
• The brace is followed for the same protective principles, with timing extended to match the meniscus repair restrictions

The surgeon-specific instructions given in clinic always supersede general guidelines.

Exercises started in week 1 (supervised by a physical therapist)

• Quad sets (ten-second holds, multiple sets per day)
• Heel slides to gain flexion
• Ankle pumps to reduce DVT risk
• Straight-leg raises once a quad contraction is reliable
• Patellar mobilizations (by the PT) to prevent scar tethering

Pain and swelling strategy

• Ice or a cryotherapy machine for 20 minutes, several times per day
• Elevation above heart level whenever seated or sleeping
• Prescribed pain regimen as directed. Most patients wean from opioids within 3-5 days

Week 2: Swelling Down, ROM Up

Primary goals: 0-110° of motion, wean off crutches as gait normalizes, continue quad activation work.

By week two the worst of the pain is typically behind the patient, and the focus shifts from survival to progress. Bruising begins migrating down the shin and into the ankle as gravity moves interstitial fluid. Swelling remains but is more responsive to ice and elevation. Patients begin to feel “less like a surgical patient and more like a person who had surgery.”

Milestones to hit

• Range of motion 0-110° (extension must remain full)
• Weaning crutches as a normal, heel-to-toe gait returns
• Stitches or staples typically come out between day 10 and day 14 at the first clinic visit
• Quad set with a visible, forceful contraction

Exercises added in week 2

• Seated knee extension in a limited, safe range
• Stationary bike with no resistance, short sessions to nudge flexion
• Wall slides and supported mini-squats (if approved by the PT)
• Continued emphasis on quad sets and straight-leg raises

Driving: Most patients are still off the road, especially after right-leg surgery. Reaction time for a panic stop is not yet reliable.

Week 3: Walking Confidently, Full Motion

Primary goals: normalized gait without crutches, 120° of flexion, confidence in single-leg stance.

By week three, most patients with an isolated ACL reconstruction are walking confidently without crutches. Timing varies: some patients are off crutches as early as the end of week 1, others take into week 2 or week 3 depending on pain, swelling, and quadriceps recruitment. The point at which crutches come off is the point at which the gait is smooth and the knee feels stable, not a fixed calendar date. For patients with a concurrent meniscus repair, the timeline is more conservative, often another three to six weeks of partial or non-weight bearing.

Milestones to hit (isolated ACLR)

• 120° of flexion
• Walking without a noticeable limp (crutches typically discontinued by this point for isolated ACLR, sometimes earlier)
• Quadriceps activation consistently returning during gait
• Brace transitioning to unlocked for ambulation once gait is even and quad function is adequate (timing is patient-specific; some reach this in week 2, others not until week 4 or beyond)
• Brace remains removed for PT and prescribed exercises
• Stationary bike can revolve a full 360° pedal stroke

For concurrent meniscus repair: Patients are typically still on partial weight bearing or non-weight bearing with flexion limited to 90°, following the repair-specific protocol.

Exercises added

• Single-leg balance on a stable surface
• Heel raises and step-downs from a low step
• Hamstring curls, carefully (especially important for hamstring graft patients, whose hamstrings take longer to return to baseline)

Week 4: The One-Month Mark

Primary goals: eliminate any extension lag, full ROM in both directions, walking feels normal.

By the end of the first month, most patients look and feel meaningfully better. The incisions are healed or nearly so, swelling is down to a low-grade morning stiffness that resolves with movement, and walking no longer requires conscious thought. The quadriceps, however, is still well behind. Quad atrophy after ACL reconstruction is measurable even in patients who look and move well.

Milestones to hit

• Full ROM (0° extension, 130° or better flexion)
• No extension lag during a straight-leg raise
• Effusion only with aggressive exercise, resolves quickly with ice and elevation
• Stationary bike with light resistance, 15 to 20 minutes continuous

Exercises added

• Mini-squats progressing to body-weight squats
• Step-ups to a 4-inch box, progressing to 6 inches
• Terminal knee extension with a resistance band
• Early hip abductor and external rotator strengthening

Weeks 5-6: First Surgeon Check and Brace Transition

Primary goals: LSI approaching 50% on quadriceps strength testing, fully unbraced ambulation, early proprioception work.

The first formal post-op clinic visit typically lands around the four- to six-week mark. This is where the surgeon evaluates incision healing, measures range of motion, checks ligament stability, and assesses the quadriceps. For most patients with isolated ACL reconstruction, this is also when the brace comes off for walking. Patients may still wear it for activities where an awkward slip is possible.

Milestones to hit

• Quad LSI trending toward 50%
• Unbraced gait without a limp
• Pool walking or aqua therapy (only once the incision is fully closed and sealed)
• Early single-leg proprioception: tandem stance, unstable surface work

What the surgeon looks for

• A well-healed incision without drainage or excessive redness
• Full extension, ideally flexion near the non-surgical side
• A stable Lachman and anterior drawer examination
• A firm quadriceps set
• Patient-reported pain that is decreasing, not increasing

If any of these trend the wrong way, the PT plan is adjusted. Persistent swelling past six weeks is a specific red flag that merits extra workup.

Weeks 7-8: Strength Phase Begins

Primary goals: quad LSI approaching 60%, structured gym-based rehabilitation, continued hip and core work.

Around weeks seven and eight, rehabilitation shifts from “protecting the repair” to “building the machine around it.” Patients move into a gym setting with their PT, performing closed-chain exercises at progressively higher loads. This is also where the evidence on hip and core strength becomes actionable. Dr. Burnham’s 2026 International Journal of Sports Physical Therapy review frames hip external rotation and trunk neuromuscular control as independent predictors of knee function after reconstruction. Work on those areas in weeks seven and eight pays compound interest in months four through nine.

Exercises that typically come online

• Leg press with increasing load (both legs, emphasizing equal effort on the surgical side)
• Hamstring curls
• Romanian deadlifts, bodyweight progressing to light dumbbells
• Weighted step-ups and step-downs
• Side-lying hip abduction, clamshells, standing hip abduction with a band
• Planks and anti-rotation core work (Pallof press)

Still not recommended

• Jogging (too early for the graft’s tensile strength)
• Impact plyometrics
• Cutting or pivoting drills

Weeks 9-12: The Three-Month Checkpoint

Primary goals: quad LSI of 70% or greater, controlled jogging progression begins, first formal hop-test screening.

The three-month mark is the first hard checkpoint in the ACL Center of Excellence protocol. Quadriceps strength is measured objectively, usually with an isokinetic dynamometer or handheld dynamometer. If LSI is at or above 70% on the surgical side compared with the non-surgical side, the patient advances into a running progression. If not, strengthening continues and the milestone is pushed to week 14 or 16.

Where the 70% threshold comes from: Published evidence consistently shows that patients who return to sport with symmetry below this range have meaningfully higher reinjury risk. The Center of Excellence protocol uses this cutoff as the gate to running, which is the first significant mechanical load on the new graft.

Running progression once 70% is achieved

• Walk-to-jog intervals on an AlterG anti-gravity treadmill if available
• Straight-line treadmill jog, 30 seconds on / 90 seconds walk, building volume
• Graduation to outdoor jogging when mechanics hold up

Hop testing begins as screening, not as clearance. The full battery includes four hops: single-leg hop for distance, triple hop, crossover hop, and timed six-meter hop, as illustrated in the Burnham 2026 IJSPT review. At this stage, testing identifies deficits so the rehabilitation can target them, rather than gating sport participation.

Strength work in this window

• Peak torque testing to establish a baseline for later measurements
• Loaded squats, split squats, deadlifts at moderate intensity
• Continued hip and trunk emphasis
• Balance and proprioception with perturbation

Months 4-6: Return to Running, Sport-Specific Training

Primary goals: LSI 85% or greater on quadriceps at six months, linear sport-specific drills, early plyometric work.

Months four through six are where the recovery starts to look athletic again. Straight-line running builds volume and speed. Plyometric work begins with low-amplitude double-leg drills (squat jumps, box jumps to a low box) and progresses toward single-leg plyometrics. Change-of-direction work starts with 45° cuts at submaximal speed, graduating to 90° cuts with planned change-of-direction patterns.

Psychological readiness screening starts in this window. The ACL-RSI (Return to Sport after Injury) scale asks patients about confidence in the knee, fear of reinjury, and motivation to return. Scores below certain thresholds are associated with slower return to sport and higher reinjury risk. Addressing fear and confidence is as important as strengthening the quadriceps.

Common setbacks in this window

• Effusion after a particularly hard session. Manage with ice and a relative deload, not panic.
• Anterior knee pain from aggressive loading, often related to patellar tendon graft donor-site soreness or quadriceps that are still lagging.
• Plateau in quad strength. This is where hip and core work again pays dividends because the whole chain starts to compensate.

Months 6-9: Return-to-Sport Testing

Primary goals: LSI 95% or greater on quadriceps, successful completion of the full RTP battery, clearance consideration at nine months.

At six months many patients feel ready to return. The data say that most are not. Grindem and colleagues showed that for every month return-to-sport was delayed up to nine months, the reinjury rate dropped. Combined with the symmetry-based criteria in the Delaware-Oslo cohort, the modern standard is clear: nine months minimum, and objective testing determines readiness.

The full return-to-sport testing battery

• Isokinetic or handheld dynamometer quadriceps strength, LSI ≥95%
• Hamstring strength, LSI ≥95%
• Single-leg hop for distance, LSI ≥90%
• Triple hop, LSI ≥90%
• Crossover hop, LSI ≥90%
• Timed six-meter hop, LSI ≥90%
• Y-balance composite score within acceptable deficit
• ACL-RSI score above the threshold

Why hop testing deserves emphasis. Dr. Burnham’s team’s published work, including Kline-Burnham 2017 in Knee Surgery, Sports Traumatology, Arthroscopy, demonstrated that hip external rotation strength independently predicts single-leg hop performance after reconstruction. Patients who pass strength tests but fail hops are usually telling the clinician something about hip and neuromuscular control, not just knee strength. That is why the rehabilitation in months four through six emphasizes hip and trunk work.

9-12 Months: Full Return to Sport

Primary goals: graduated return to practice, then scrimmage, then competition.

Clearance at nine months is not a switch that flips. It is a runway. Most athletes enter non-contact practice first, then gradually introduce contact, competitive drills, and finally full competition over the next four to eight weeks. This staged return has become standard practice in most high-performing sports medicine programs.

What happens in this window

• Non-contact drills and practice
• Contact practice once the athlete is symptom-free after non-contact
• Scrimmage or controlled competition
• Full unrestricted competition

Functional brace discussion. Many athletes ask about wearing a functional brace after return. The published evidence is mixed. A brace does not meaningfully change reinjury risk in most studies, but some athletes feel more confident wearing one for the first competitive season. This is a shared decision between patient and surgeon, not a data-driven mandate.

Retear and contralateral tear counseling. The first two years post-op carry the highest risk of both reinjury and contralateral ACL tear, especially in young athletes returning to cutting and pivoting sports. Neuromuscular training does not end at clearance; it continues through the first competitive year as maintenance.

When to Call the Office , At Any Point

The list below applies across the entire recovery, not just the first week.

When in doubt, the office would rather take a phone call than have a patient delay.

What Affects Your Timeline

Every patient’s recovery reflects a combination of biology, biomechanics, and the specific surgery performed. The factors below shift timelines by days or weeks.

Graft type. Each graft has tradeoffs. Quadriceps tendon autograft has gained popularity for primary reconstruction because of favorable strength profiles and donor-site tolerance. Patellar tendon autograft offers strong fixation and excellent outcomes in younger athletes but carries some anterior knee pain risk. Hamstring autograft preserves extensor strength but delays hamstring recovery. Allograft can be appropriate for older or less active patients but is associated with higher retear rates in young athletes, as MOON cohort data from Kaeding and colleagues has shown. The full graft discussion is covered on the ACL graft options page.

Concomitant surgery. A meniscus repair alongside ACL reconstruction changes the first six weeks in two specific ways. Weight bearing is often limited or held at non-weight bearing for up to four to six weeks, depending on the type and location of the repair. Range of motion is frequently restricted to 90° of flexion for up to four weeks to protect the repair. The patient stays on crutches longer, and early strengthening is adapted to respect these limits. The overall arc to sport is roughly similar, but the early weeks look quite different.

Age and sex. Young female athletes have higher rates of retear and contralateral ACL injury, particularly those returning to pivoting sports. The anatomic and hormonal contributors are discussed in Dr. Burnham’s 2017 Clinics in Sports Medicine review on the female athlete. Older patients with lower athletic demand have a different risk profile and often a gentler return-to-activity arc.

Psychological readiness. The ACL-RSI and related tools have demonstrated that fear of reinjury and loss of confidence independently predict return to sport and reinjury risk. Addressing fear through graded exposure and honest performance data is part of the clinical plan, not an afterthought.

Prehab quality. Patients who enter surgery with better quadriceps strength and full range of motion reach every subsequent milestone faster.

Frequently Asked Questions

References

1. Burnham JM, Drazick A, Aminake G, Johnson DL, Ireland ML, Noehren BW. Current Concepts in Hip and Core Assessment to Reduce the Risk of ACL Injury. International Journal of Sports Physical Therapy. 2026 Feb;21(2):210-222. DOI | PubMed | Full Text PDF
2. Kline PW, Burnham J, Yonz M, Johnson DL, Ireland ML, Noehren B. Hip external rotation strength predicts hop performance after anterior cruciate ligament reconstruction. Knee Surgery, Sports Traumatology, Arthroscopy. 2018;26(4):1137-1144. DOI | PubMed | Full Text PDF
3. Burnham JM, Wright VJ. Update on ACL Rupture and Treatment in the Female Athlete. Clinics in Sports Medicine. 2017;36(4):703-715. DOI | PubMed | Full Text PDF
4. van Melick N, van Cingel REH, Brooijmans F, et al. Evidence-based clinical practice update: practice guidelines for anterior cruciate ligament rehabilitation based on a systematic review and multidisciplinary consensus. British Journal of Sports Medicine. 2016;50(24):1506-1515. DOI | PubMed
5. Grindem H, Snyder-Mackler L, Moksnes H, Engebretsen L, Risberg MA. Simple decision rules can reduce reinjury risk by 84% after ACL reconstruction: the Delaware-Oslo ACL cohort study. British Journal of Sports Medicine. 2016;50(13):804-808. DOI | PubMed
6. Kaeding CC, Aros B, Pedroza A, Pifel E, Amendola A, Andrish JT, Dunn WR, Marx RG, McCarty EC, Parker RD, Wright RW, Spindler KP. Allograft versus Autograft Anterior Cruciate Ligament Reconstruction: Predictors of Failure from a MOON Prospective Longitudinal Cohort. Sports Health. 2011;3(1):73-81. DOI | PubMed