PCL Tear
The posterior cruciate ligament (PCL) crosses inside the knee joint and prevents the shinbone from sliding backward relative to the thighbone. PCL tears are less common than ACL tears—accounting for about 3–20% of knee ligament injuries depending on the population studied—but they are frequently under-diagnosed because the knee may remain functional enough that patients do not realize the injury is serious. The classic mechanism is a direct blow to the front of the bent knee, as in a car dashboard injury or a football tackle.
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Symptoms
- Pain in the back of the knee immediately after injury
- Swelling that develops over the first few hours
- Stiffness and difficulty bending the knee fully
- A feeling of instability or looseness in the knee, especially going down stairs
- Pain that worsens with prolonged standing or walking
- In combined ligament injuries, more severe instability and swelling
When to See a Doctor
See an orthopaedic surgeon if you take a direct blow to the front of a bent knee followed by pain and swelling. PCL tears are commonly missed at initial evaluation; if your knee feels unstable going down stairs or hills after a knee injury, specifically ask for a PCL assessment.
Treatment Options
Conservative management (isolated Grade I–II)
Most isolated PCL tears—even some Grade III complete tears—can be managed without surgery. Quadriceps strengthening is the cornerstone, as strong quads compensate for PCL function. Bracing during activity, physical therapy, and gradual return to sport over 6–12 weeks.
PCL reconstruction surgery
Recommended for Grade III tears causing functional instability, combined ligament injuries (PCL + ACL, PCL + posterolateral corner), and when conservative treatment fails. The torn ligament is replaced with a graft—typically patellar tendon, hamstring, or donor tissue. Technically more demanding than ACL reconstruction.
Recovery Timeline
Conservative management: return to light activity in 4–6 weeks, full return to sport in 3–6 months with extensive physical therapy. Surgical reconstruction: protected weight-bearing for 4–6 weeks, return to sport at 9–12 months. Combined ligament injuries take the longest—up to 12–18 months of recovery.
Frequently Asked Questions
Is a PCL tear worse than an ACL tear?
Not necessarily—isolated PCL tears often do better with conservative treatment than ACL tears. However, PCL injuries are more likely to occur alongside other ligament damage (ACL, posterolateral corner), which makes combined injuries more complex to treat than most isolated ACL tears. The prognosis really depends on what else was injured at the same time.
Can you return to sport with a PCL tear?
Many athletes return to sport with an incompletely healed PCL tear using a brace and quad strengthening. Contact athletes often can, though some develop knee pain or instability years later if the PCL does not heal well. Athletes who want to return to cutting and pivoting sports at a high level may be better served by surgical reconstruction.
What type of doctor treats PCL tears?
Orthopaedic surgeons who specialize in sports medicine or knee surgery treat PCL tears. Because PCL injuries are less common than ACL tears, look for a surgeon who specifically has experience with PCL reconstruction if surgery is needed—it is a more technically demanding procedure.
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This information is for educational purposes only and is not a substitute for professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment.