What to Expect on Postoperative Day 15 After ACL Reconstruction
At postoperative day 15, you should be performing isometric quadriceps exercises (static quadriceps contractions and straight leg raises) daily, working toward full knee extension and at least 90-115° of knee flexion, walking with a normalized gait pattern, and managing any residual swelling and pain. 1
Key Rehabilitation Activities at Week 2 (Day 15)
Exercises You Should Be Doing
- Isometric quadriceps contractions - These can be safely prescribed during the first 2 postoperative weeks and provide faster recovery of knee range of motion at 1 month without compromising graft stability 1
- Straight leg raises - Safe and beneficial during this early phase
- Early mobilization exercises - Focus on regaining knee flexion and extension range of motion
Range of Motion Goals
- Extension: Working toward 0° (full extension)
- Flexion: Target of 90-115° by end of week 6-9 2
- Early mobilization improves knee flexion and extension range of motion without compromising knee laxity, regardless of graft type 1
Weight-Bearing Status
- You should be weight-bearing as tolerated unless your surgeon has specified otherwise
- Early weight-bearing (immediate mobilization) demonstrates a large beneficial effect on patellofemoral pain reduction (from 35% to 8% in bone-patellar tendon grafts) without affecting laxity, range of motion, or subjective knee function at 1-year follow-up 1
Pain and Swelling Management
- Effusion should be 1+ or less as you progress 2
- Some residual swelling is normal at day 15
- C-reactive protein (CRP) levels peak around day 3 and should be decreasing by day 7, normalizing by day 15-30 3
- Important caveat: If you have increasing pain, swelling, warmth, or fever at day 15, this deviates from the normal recovery pattern and warrants immediate evaluation for possible infection 3
What NOT to Do Yet
Exercises to Avoid
- No open kinetic chain exercises (like seated knee extensions) until at least week 4 - there is no evidence supporting their safety before the fourth postoperative week 1
- No leg press until week 3 at earliest 1
- No running, jumping, or agility work - these come much later (running at 10-16+ weeks when quadriceps strength reaches 80% limb symmetry) 2
Target Milestones for Early Phase (Weeks 0-6)
By the end of week 6, you should achieve:
- Quadriceps strength: ≥60% limb symmetry index (LSI) 2
- Range of motion: 0° to 115° 2
- Normalized gait pattern 2
- Minimal effusion (1+ or less) 2
Clinical Reasoning
The 2023 Aspetar guidelines 1 provide the strongest evidence framework, emphasizing that the first 2 weeks focus on protecting the graft while initiating safe exercises that don't compromise stability. The isometric quadriceps work you're doing now lays the foundation for more aggressive strengthening that begins at week 3-4. Hamstring grafts may be more vulnerable to early aggressive rehabilitation compared to bone-patellar tendon-bone grafts, so exercise progression should be monitored carefully 1.
Common pitfall: Patients often want to progress exercises too quickly. Advancing to open kinetic chain exercises or leg press before week 3-4 lacks evidence for safety and may increase anterior knee pain 1.