Based on the three MRI findings — ACL sprain, near full-thickness patellar cartilage loss, and lateral tibial bone contusion — here is the complete physiotherapy (PT) management protocol organized by phase.
Physiotherapy Management — Left Knee
Conditions Being Addressed
- ACL Sprain (intact, no tear — Grade I–II)
- Patellofemoral Chondral Damage (near full-thickness cartilage loss, medial & lateral patellar facets)
- Lateral Tibial Condyle Bone Contusion
Phase 1 — Acute / Protection Phase (Week 1–2)
Goals: Control pain and swelling, protect healing tissues, prevent muscle wasting
| Modality / Exercise | Details |
|---|
| RICE Protocol | Rest, Ice (15–20 min, 3–4x/day), Compression bandage, Elevation |
| Transcutaneous Electrical Nerve Stimulation (TENS) | For pain relief — 80–100 Hz, 20–30 min/session |
| Ultrasound Therapy | Pulsed mode (1:4 duty cycle) over lateral tibial condyle and patellar region — promotes bone contusion healing and reduces inflammation |
| Knee brace / patellar stabilizing brace | Worn during activity to offload patellofemoral joint and provide ACL proprioceptive support |
| Ankle pumps | Active dorsiflexion/plantarflexion — prevents DVT, maintains circulation |
| Static Quadriceps contractions (Quad sets) | Patient lies flat, tightens quad without moving knee — hold 5 sec × 10 reps × 3 sets |
| Straight Leg Raises (SLR) | Supine, leg raised to 45°, held 5 sec — prevents VMO atrophy |
| Patellar Taping (McConnell Technique) | Medial glide taping to correct lateral patellar maltracking — reduces patellofemoral pain |
Avoid: Deep squatting, stairs, resisted knee flexion beyond 90°, running
Phase 2 — Subacute / Strengthening Phase (Week 3–6)
Goals: Restore full ROM, strengthen VMO and surrounding muscles, improve neuromuscular control
Range of Motion
- Passive/Active-Assisted Knee Flexion/Extension — progress to full ROM (0–135°)
- Heel slides in supine — controlled ROM without loading cartilage
- Stationary cycling (low resistance, seat raised high) — low patellofemoral joint stress
VMO & Quadriceps Strengthening (critical for patellar cartilage protection)
Bailey & Love's (p. 644) specifically emphasizes VMO development to counteract patellofemoral maltracking and prevent wasting.
| Exercise | Sets × Reps |
|---|
| Terminal Knee Extensions (TKE) with resistance band | 3 × 15 — strengthens VMO in terminal range |
| Short Arc Quads (0–30° extension only) | 3 × 15 — safe range for damaged patellar cartilage |
| Wall slides / Mini squats (0–45° only) | 3 × 15 — avoid >45° to reduce patellofemoral stress |
| Step-ups (low step, 10 cm) | 3 × 10 each leg |
| Leg press (low resistance, 0–60° only) | 3 × 15 |
Hamstring & Hip Strengthening (for ACL protection)
| Exercise | Sets × Reps |
|---|
| Prone hamstring curls | 3 × 15 |
| Hip abduction in side-lying | 3 × 15 (strengthens glutes, reduces valgus stress on knee) |
| Bridges (Glute bridges) | 3 × 15 |
| Clamshells with resistance band | 3 × 15 |
Electrotherapy (continued)
- NMES (Neuromuscular Electrical Stimulation) over VMO — augments voluntary contraction, reduces atrophy
- IFT (Interferential Therapy) at 80–120 Hz — deep pain relief and edema reduction
Phase 3 — Functional / Neuromuscular Phase (Week 7–12)
Goals: Restore proprioception, functional strength, prepare for daily activities
| Exercise | Purpose |
|---|
| Single-leg balance (eyes open → eyes closed) | Proprioception and ACL neuromuscular re-education |
| Balance board / wobble board training | Dynamic proprioception |
| Lateral band walks | Hip abductor and knee stabilizer activation |
| Partial squats with resistance band (0–60°) | Functional strengthening within safe cartilage range |
| Stair training (step-over-step, supervised) | Functional reintegration |
| Swimming / Hydrotherapy | Low-impact full-ROM exercise — excellent for cartilage nutrition |
| Stationary bike with increased resistance | Cardiovascular fitness + quad endurance |
Key Physiotherapy Principles for This Case
| Principle | Rationale |
|---|
| Avoid deep knee flexion (>90°) | Patellofemoral contact pressure peaks at 60–90°; full-thickness cartilage loss means bone-on-bone risk beyond this |
| Patellar taping throughout rehab | Corrects maltracking, reduces pain during exercise |
| VMO strengthening is priority #1 | VMO is the primary dynamic stabilizer of the patella — its weakness is the main driver of patellofemoral pain and cartilage wear |
| No impact loading until Phase 3 | Bone contusion at lateral tibial condyle needs 6–8 weeks to heal |
| ACL proprioceptive drills | Even without a tear, the sprain disrupts proprioceptive nerve endings in the ACL — balance and neuromuscular drills restore this |
Modalities Summary Table
| Modality | Phase | Target |
|---|
| TENS | 1–2 | Pain |
| Pulsed Ultrasound | 1–2 | Bone contusion, inflammation |
| IFT | 1–3 | Deep pain, edema |
| NMES / EMS | 2–3 | VMO activation, muscle wasting |
| McConnell Patellar Taping | 1–3 | Patellar maltracking |
| Hydrotherapy | 3 | Cartilage nutrition, ROM |
Duration & Follow-up
- Total PT duration: 10–12 weeks minimum
- Re-assess at 6 weeks — check ROM, VMO strength, pain levels
- Orthopedic review at 8–12 weeks — specialist decision on whether viscosupplementation (HA injection), PRP, or further intervention is needed for the cartilage damage
- Return to sport/heavy activity: Only after passing functional strength testing (limb symmetry index >90%)
⚠️ This protocol is a clinical guide. A qualified physiotherapist must individualize exercises based on the patient's age, fitness level, pain tolerance, and clinical examination findings.