Knee

PCL Tear

The posterior cruciate ligament (PCL) is the strongest ligament in the knee (roughly twice as stout as the ACL), yet it remains underdiagnosed because many isolated injuries produce only mild symptoms. At Maryland Orthopedic Specialists, our sports medicine physicians have extensive experience distinguishing isolated PCL injuries from more complex multi-ligament knee trauma, ensuring each patient receives a precisely tailored treatment plan whether that means supervised rehabilitation or surgical reconstruction.

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What is pcl tear?

The PCL runs from the posterior tibia to the anterior medial wall of the femoral notch, preventing the tibia from sliding backward on the femur. It consists of two functional bundles: the larger anterolateral bundle (taut in flexion) and the posteromedial bundle (taut in extension).

Injury mechanisms include:

Dashboard injury: a posteriorly directed force on the proximal tibia in a flexed knee, the classic motor-vehicle-collision pattern
Fall on a flexed knee with the foot plantar-flexed (e.g., contact sports, wrestling)
Hyperextension combined with a varus or valgus force, often signaling multi-ligament involvement

PCL tears are graded by the degree of posterior tibial translation relative to the femoral condyles:

PCL Grading:

Grade I: < 5 mm posterior translation — Partial tear; firm end-point
Grade II: 5–10 mm posterior translation — Complete; tibia flush with condyles
Grade III: > 10 mm posterior translation — Complete; tibia posterior to condyles

Grade III injuries have a high association with posterolateral corner (PLC), MCL, and ACL co-injuries, which must be evaluated systematically.

Symptoms — do you recognize these?

Posterior knee pain and swelling acutely; may be surprisingly mild
Sensation of instability on stairs or during deceleration
Posterior tibial sag — the classic resting sign when the knee is held at 90° of flexion; gravity causes the tibia to sag posteriorly
Difficulty with stair descent and pivoting activities
Chronic cases often present with medial compartment or patellofemoral pain from altered biomechanics

Call us at (301) 515-0900. Same-day appointments available at our Bethesda and Germantown locations.

How we diagnose it

Physical Examination

Posterior drawer test: the gold standard; posterior tibial translation at 90° of flexion
Posterior sag sign (Godfrey test): observed with hips and knees at 90°
Quadriceps active test: isometric quadriceps contraction reduces a sagging tibia, confirming posterior instability
Dial test (30° and 90°) — assesses concurrent PLC injury; > 10° difference at 30° only suggests isolated PLC; > 10° at both angles implies combined PCL + PLC injury
KT-1000 arthrometer — provides objective side-to-side displacement measurements useful for grading and post-operative surveillance

Imaging

Weight-bearing X-rays: assess for avulsion fractures (tibial insertion avulsions are amenable to direct repair), joint space narrowing, and alignment
MRI: modality of choice for characterizing the PCL, associated ligament injuries, meniscal tears, and chondral lesions; fluid signal within the ligament confirms tear and bundle involvement
CT: reserved for complex bony avulsions or pre-operative planning

Treatment options

Most isolated PCL tears, even complete Grade III injuries, respond well to non-operative management, making PCL treatment fundamentally different from ACL management. The PCL's intra-capsular but extra-synovial location and rich vascular envelope support meaningful healing potential that the ACL lacks.

Non-Operative Management

Structured non-operative care is appropriate for Grade I, Grade II, and most isolated Grade III PCL tears in patients who do not participate at the highest athletic levels. During the acute phase, a PCL brace holding the knee in extension reduces posterior tibial sag by using gravity and the brace architecture to maintain normal tibial alignment while the ligament heals. The cornerstone of rehabilitation is aggressive quadriceps strengthening, because a strong quadriceps serves as the primary dynamic substitute for the PCL by actively resisting posterior tibial translation. Hamstring flexibility, proprioception training, and progressive sport-specific loading are added as symptoms allow. Return to sport typically occurs within 8–12 weeks for Grade I and II injuries, while Grade III injuries managed non-operatively require 4–6 months of structured rehabilitation before competitive return.

Surgical Procedure

PCL Reconstruction

Reconstruction of the posterior cruciate ligament using a transtibial tunnel graft or tibial inlay approach through a posterior incision. Technique is selected based on the degree of instability, concurrent ligament injuries, and patient demands.

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Recovery & rehabilitation

0–6 weeks: PCL brace locked in extension; protected weight-bearing; quadriceps activation exercises
6–12 weeks: Progressive range of motion to 90°+; closed-chain strengthening; brace weaning
3–6 months: Sport-specific training; single-leg strengthening; agility drills
6–9 months: Return-to-sport testing including KT-1000 and hop tests
12 months: Full competitive return for high-demand athletes after surgical reconstruction

Non-operative patients with isolated Grade II injuries often return to sport by 3–4 months with quadriceps-focused rehabilitation.

Frequently Asked Questions

Can a PCL tear heal on its own?

Yes. Isolated Grade I and II PCL tears have substantial healing potential because the PCL is an intra-capsular but extra-synovial structure surrounded by a rich vascular envelope. Grade I–II injuries routinely recover full function with physical therapy.

Why is the PCL called the strongest ligament in the knee?

Its cross-sectional area and ultimate tensile load exceed those of the ACL by approximately 20–50%, reflecting its role resisting the large posterior shear forces generated during daily activities such as stair descent.

What happens if a PCL tear is missed?

Untreated high-grade PCL injuries lead to progressive posterior instability, medial compartment cartilage overloading, patellofemoral malalignment, and accelerated osteoarthritis.

How is PCL surgery different from ACL surgery?

PCL reconstruction is technically more demanding (the popliteal neurovascular bundle is immediately posterior to the tibial attachment) and requires careful graft tunnel positioning to minimize graft bending ("killer turn") and maximize biomechanical function.

How long does recovery take after PCL reconstruction, and when can I return to sport?

PCL reconstruction is associated with a recovery timeline of nine to twelve months before return to sport, in part because the PCL graft is under significant tension during knee flexion and matures slowly. Early rehabilitation focuses on quadriceps strengthening and controlled range of motion, avoiding positions that stress the healing graft. Sport-specific training typically begins at six to eight months, with full clearance contingent on passing strength and functional testing. Your MOS surgeon will monitor your progress carefully and will not clear you for competitive sport until objective criteria are met.