Post‑ACL Reconstruction Rehabilitation Guidelines (Evidence‑Based)

Core Rehabilitation Principles

Initiate full‑range‑of‑motion knee exercises within the first postoperative week to prevent extension deficits and reduce soft‑tissue complications. 3
Begin early weight‑bearing as tolerated from the first postoperative days, progressing based on pain and swelling levels. 3

Start pain‑free isometric quadriceps exercises (static contractions, straight‑leg raises) within the first two weeks to accelerate ROM recovery without compromising joint stability. 4
Commence leg‑press training at approximately three weeks post‑surgery to improve subjective knee function and overall functional outcomes. 4
Apply cryotherapy during the first 48 hours after surgery to reduce knee pain without increasing adverse‑event risk. 3
Add neuromuscular electrical stimulation to the isometric program during weeks 6‑8 to re‑educate voluntary quadriceps contraction and increase strength. 3
Introduce aquatic therapy once the surgical wound has healed (around weeks 3‑4) as an adjunct to enhance perceived knee function. 5

Introduce open kinetic‑chain knee exercises limited to 90°‑45° flexion as early as four weeks; note that hamstring grafts may be more vulnerable than bone‑patellar‑tendon grafts. [4][3]
Combine open and closed kinetic‑chain exercises for optimal quadriceps strength recovery, while monitoring for increased anterior knee pain with open‑chain work. 4
Implement isokinetic hamstring strengthening using functional patterns (e.g., 0°‑45° half‑squat) beginning at three weeks to improve hamstring and quadriceps strength and overall function. 4

Initiate eccentric cycle‑ergometer training at three weeks (instead of 12 weeks) to achieve greater quadriceps strength gains, better daily‑activity performance, and sustained hypertrophy up to one year post‑surgery without affecting joint laxity. 4
Require pain‑free aqua jogging and Alter‑G treadmill running as criteria for progression to running. 5
Ensure absence of joint effusion or only trace swelling before advancing to running activities. 5

Employ combined eccentric and plyometric training to produce superior improvements in balance, functional activities, subjective knee function, and psychological readiness compared with either modality alone. 4
Add core‑stability exercises to further enhance functional outcomes and perceived knee function. 5

Require peak isokinetic torque symmetry of 100 % for quadriceps and hamstrings at 60°/s for high‑demand pivoting sports. 6
Achieve limb‑symmetry index ≥ 90 % for quadriceps strength and hop testing before clearance for sport participation. 6
Demonstrate jump‑height symmetry > 90 % in countermovement and drop jumps. 6
Show concentric and eccentric impulse symmetry > 90 % and a reactive‑strength index > 1.3 for bilateral jumps (and > 0.5 for unilateral jumps). 6
Confirm complete absence of pain and swelling, full symmetric knee ROM, and normal Lachman, pivot‑shift, and instrumented laxity examinations. 6
Verify psychological readiness with normalized IKDC and Tampa Scale of Kinesiophobia scores and completion of a sport‑specific training program. 6

Allow driving clearance after approximately 4–6 weeks for reconstruction on the right side and 2–3 weeks for reconstruction on the left side. [5][6]
Do not prescribe postoperative knee bracing; evidence shows no benefit in limb symmetry or clinical outcomes. 3
Avoid continuous passive motion devices, which have not demonstrated advantage in postoperative recovery. 3
Prefer supervised rehabilitation programs over unsupervised home‑based programs for superior outcomes, though minimally supervised regimens may be acceptable for highly motivated patients with limited access. 3

Do not rely solely on time‑based milestones for progression; objective functional testing must guide rehabilitation and return‑to‑sport decisions. [1][6]
Do not permit return to sport when limb‑symmetry index is below 90 % for strength or hop testing, as this raises reinjury risk. 6
Monitor hamstring grafts closely when introducing early open kinetic‑chain exercises, given their increased vulnerability compared with patellar‑tendon grafts. 4
Ensure formal assessment of psychological readiness before sport clearance rather than assuming readiness. 6