PCL Injury

The Posterior Cruciate Ligament (PCL) is one of the four major ligaments inside the knee. It connects the thigh bone (femur) to the shin bone (tibia) and plays a key role in preventing the tibia from moving backward. Along with the ACL, the PCL keeps the knee stable during walking, running, jumping and changing direction.

Although PCL injuries are less common than ACL injuries, they can lead to knee pain, instability and difficulty with sports or daily activities if not treated properly.

How Does a PCL Injury Happen?

The most common way the PCL gets injured is through a direct blow to the front of the shin when the knee is bent.

Typical situations include:

• Dashboard injury during a car or bike accident
• Falling directly on the front of the knee
• Sports trauma such as tackles or collisions
• Sudden hyperextension of the knee

PCL injuries can occur alone or together with other ligament or meniscus injuries.

Symptoms of PCL Injury

Signs and symptoms vary depending on the severity of the injury:

• Pain deep inside the knee
• Swelling shortly after the injury
• Difficulty walking down slopes or stairs
• Feeling of looseness or instability in the knee
• Discomfort when kneeling or squatting
• Weakness during running and sudden stops

While ACL injuries often cause dramatic instability, PCL injuries may appear milder initially — which sometimes causes patients to delay treatment.

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Diagnosis

Diagnosis requires:

• History of trauma
• Clinical examination
• Special tests such as Posterior Drawer Test or Sag Sign to assess PCL integrity

MRI is used to confirm the diagnosis and see whether the tear is:

• Partial or complete
• Isolated or associated with other ligament/meniscus injuries

X-rays may also be taken to rule out fractures.

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Treatment Options

Treatment depends on the severity of the tear and level of knee instability.

Non-Surgical Treatment

Most isolated Grade 1 and Grade 2 PCL tears respond well to:

• Rest and activity modification
• Ice and pain medications as advised
• Physiotherapy to strengthen quadriceps and hamstrings
• PCL brace to support the knee during healing
• Ultrasound guided PRP injection

Many patients recover good function with structured rehabilitation.

Surgical Treatment

Surgery is recommended in the following cases:

• Complete PCL tears (Grade 3)
• Persistent instability despite physiotherapy
• Multiligament injuries (PCL + ACL / LCL / MCL)
• High-demand athletes who require full stability

Surgery is done by arthroscopic PCL reconstruction, where the torn PCL is removed and replaced with a graft (usually hamstring, peroneus longus, quadriceps tendon, or allograft). The graft functions as the new PCL and helps restore stability.

Goals of PCL reconstruction:

• Eliminate instability
• Restore knee biomechanics
• Allow return to sports and active lifestyle
• Prevent long-term cartilage damage and arthritis

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Recovery After PCL Injury

Recovery time varies depending on severity and treatment.

Typical recovery roadmap:

Phase	Milestones
0–6 weeks	Brace support, guided physiotherapy begins
6–12 weeks	Improved walking, increased strengthening
3–6 months	Light jogging and functional training
6–9 months	Return to most sports
9–12 months	Return to high-impact or pivoting sports (after clearance)

Strong physiotherapy commitment is crucial for the best outcome.

Key Takeaway

PCL injuries may seem mild initially, but untreated instability can lead to cartilage damage and early arthritis.
With timely diagnosis and the right treatment — whether rehabilitation or arthroscopic reconstruction — most patients regain a stable, pain-free and active knee.