Posterior Cruciate Ligament (PCL) Injury Treatment Options
The posterior cruciate ligament (PCL) is one of the major stabilizing ligaments in the knee. Located behind the ACL, it prevents the tibia (shinbone) from sliding backward relative to the femur (thighbone). The PCL also plays a key role in controlling rotational stability and supporting the knee during squatting, descending stairs, and landing from jumps.
PCL injuries are less common than ACL tears and often occur from a direct blow to the front of the knee, such as during a dashboard impact in a car accident or a fall onto a bent knee during sports. They may also occur in combination with injuries to the ACL, MCL, FCL, or the posterolateral corner (PLC). Patients often report pain in the back of the knee, swelling, stiffness, and a feeling of instability—especially when walking downhill or descending stairs.
Accurate diagnosis and appropriate management are important, because untreated PCL injuries can lead to increased stress in the knee’s compartments over time and contribute to cartilage wear or meniscal damage.
Diagnosis begins with a detailed history and physical examination. Dr. José Vega will assess for swelling, tenderness, and posterior sag of the tibia—a hallmark sign of PCL injury. Tests such as the posterior drawer test, quadriceps active test, and dial test can further evaluate the type and severity of the injury and determine whether other ligaments or structures are involved.
X-rays help identify bone injuries or subtle signs of instability. MRI is the most reliable tool for confirming a PCL tear, determining the grade of the injury, and identifying associated ligament, meniscus, or cartilage damage. Kneeling stress x-rays can also help to identify PCL insufficiency in the case of chronic injuries or in situations where the MRI is inconclusive.
Many isolated Grade I and Grade II PCL tears heal well without surgery because the PCL has a better blood supply than the ACL. For these injuries, nonsurgical management often provides excellent stability and long-term function.
Nonsurgical treatment includes:
Bracing
A dynamic PCL brace is often used to apply an anterior force to the tibia and prevent it from sagging backward during healing. This allows the PCL to heal in a more normal position and can prevent chronic knee laxity or instability from developing. Patients typically wear the brace for several months, especially during walking and early strengthening activities.
Physical Therapy
Therapy focuses on:
- Restoring full extension and controlled flexion
- Strengthening the quadriceps (especially important for stabilizing the tibia)
- Improving hip and core strength
- Enhancing balance and proprioception
Hamstring strengthening is introduced cautiously because hamstring contraction can increase posterior tibial translation.
Most patients with isolated PCL sprains recover within 6–12 weeks, though return to high-level sports may take longer.
Activity Modification
Early avoidance of deep squats, downhill running, and high-impact sports protects the healing ligament.
For many patients, this approach results in excellent long-term outcomes without surgery, particularly when the injury is isolated and mild to moderate in severity.
Surgery becomes a more important consideration when:
- The tear is Grade III (complete rupture)
- There is combined ligament injury (ACL, MCL, LCL, or PLC)
- Instability persists despite a full course of nonsurgical treatment
- There are fractures or avulsion-type injuries
- The patient is a high-level athlete with significant functional limitations
- Posterior sagging leads to altered knee mechanics and progressive pain
Because the PCL is crucial for controlling backward motion and rotational stability, untreated high-grade tears can place abnormal stress on the joint and accelerate cartilage wear.
PCL Reconstruction
PCL reconstruction is the most common surgical option for significant or symptomatic injuries. Because the PCL rarely heals in an anatomic position once completely torn, reconstruction—rather than repair—is generally preferred.
A graft (often from the quadriceps tendon, hamstring tendons, or allograft) is inserted using tunnels in the tibia and femur to recreate the native PCL. Modern techniques often use double-bundle or anatomic reconstruction to better restore the ligament’s normal structure and function.
Reconstruction is especially important when the PCL is injured in combination with other ligaments such as the PLC or ACL, as isolated treatment of one ligament without addressing the others can lead to persistent instability.
PCL Repair
Repair is reserved for very select cases, usually involving tibial avulsion injuries, where the ligament has pulled off a piece of bone. These can be fixed with screws or sutures. True midsubstance tears are generally not repairable.
Recovery after PCL reconstruction is methodical and requires structured rehabilitation. Patients typically follow:
- Up to 6 months of bracing to support the healing PCL graft
- Protected weight-bearing early on
- Gradual restoration of range of motion, avoiding high degrees of flexion early
- Targeted quadriceps strengthening
- Progressive return to running and agility training
Return to sports typically occurs around 9–12 months, depending on associated injuries and progress in therapy.
PCL injuries vary widely in severity, but with proper diagnosis and a tailored treatment plan, most patients can return to active, pain-free lifestyles. Incomplete, isolated tears often heal successfully without surgery, while more severe or combined injuries may require reconstruction to restore stability and protect long-term knee health.
If you are experiencing posterior knee pain, instability, or difficulty with walking downhill or descending stairs after an injury, please contact Dr. José Vega’s office in Cleveland to schedule a consultation. Together, we’ll review your imaging, discuss your goals, and design a personalized treatment plan to help you safely return to your activities.
References
- Bedi A, Musahl V, Cowan JB. Management of Posterior Cruciate Ligament Injuries: An Evidence-Based Review. J Am Acad Orthop Surg. 2016;24(5):277-289.
- Chahla J, Williams BT, LaPrade RF. Posterior Cruciate Ligament. Arthroscopy. 2020;36(2):333-335.
- Kennedy NI, LaPrade RF, Goldsmith MT, et al. Posterior cruciate ligament graft fixation angles, part 2: biomechanical evaluation for anatomic double-bundle reconstruction. Am J Sports Med. 2014;42(10):2346-2355.
- LaPrade RF, Cinque ME, Dornan GJ, et al. Double-Bundle Posterior Cruciate Ligament Reconstruction in 100 Patients at a Mean 3 Years’ Follow-up: Outcomes Were Comparable to Anterior Cruciate Ligament Reconstructions. Am J Sports Med. 2018;46(8):1809-1818.
- Pache S, Aman ZS, Kennedy M, et al. Posterior Cruciate Ligament: Current Concepts Review. Arch Bone Jt Surg. 2018;6(1):8-18.
- Parolie JM, Bergfeld JA. Long-term results of nonoperative treatment of isolated posterior cruciate ligament injuries in the athlete. Am J Sports Med. 1986;14(1):35-38.
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Dr. Jose Vega
- Board-certified orthopedic surgeon
- Fellowship-trained sports medicine specialist
- Author of industry leading peer reviewed publications
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