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PCL Reconstruction


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Introduction

This page covers the rehabilitation of posterior cruciate ligament (PCL) injuries following surgical reconstruction. For an overview of PCL injuries, including anatomy, clinical presentation, assessment, and treatment decision-making, see Posterior Cruciate Ligament Injury. For conservative management, see Non-operative Treatment of PCL Injury.

Surgical Approach

PCL reconstruction can be performed using a range of techniques, including single-bundle and double-bundle approaches, via transtibial or tibial inlay and onlay methods, and through open, arthroscopically assisted, or fully arthroscopic procedures.[1]

Single-bundle reconstruction (SBR) reconstructs the larger anterolateral bundle, while double-bundle reconstruction (DBR) reconstructs both bundles, aiming to more closely restore native knee kinematics.[2]

DBR may produce better outcomes in terms of stability than SBR,[3] but there is currently no consensus on which method is superior.[4][5] Expert endorsement of DBR remains limited, potentially because of its greater complexity, higher complication risk and cost.[6] Long-term randomised controlled trials comparing surgical approaches are, however, lacking, and further research is needed.[6]

Regardless of the surgical technique used, the core principles of post-operative rehabilitation remain the same: protecting the graft from posterior tibial translation, prioritising quadriceps function, and progressing through criterion-based phases.

Complications of PCL Reconstruction

Intraoperative complications can include fracture, popliteal artery injury, and compartment syndrome. Post-operative complications include residual laxity, loss of range of motion, anterior knee pain, painful hardware, heterotopic ossification and infection.[6]

Post-Operative Rehabilitation

There is no universally accepted rehabilitation protocol following PCL reconstruction. A 2018 literature review found substantial variation across published protocols in weight-bearing status, range of motion progression, bracing duration, and exercise selection.[7]

Specific post-operative restrictions and protocols depend on the operating surgeon's instructions, the surgical technique used, and any concurrent procedures performed. The sections below highlight areas of broad consensus across protocols and consensus statements rather than a definitive standard.

Key Principles

Despite variation in protocols, there is general agreement on the following principles:[6][7][8][9][10]

  • Protect the graft from posterior tibial translation — this is the overarching priority throughout rehabilitation.
  • Prioritise early quadriceps reactivation. The quadriceps muscle pulls the tibia anteriorly and acts as a dynamic stabiliser that supports PCL function.
  • Begin patellofemoral mobilisation early to maintain the integrity of the superior patellar pouch and the anterior interval.
  • Perform ROM exercises in prone initially to minimise posterior tibial sag.
  • Avoid unsupported knee flexion in the early post-operative period, as gravity exerts a posterior force on the tibia.
  • Avoid isolated resisted hamstring exercises in the early post-operative period. Hamstring contraction draws the tibia posteriorly, which can compromise graft integrity. The timing for introducing hamstring strengthening is one of the most debated aspects of PCL rehabilitation, with recommendations ranging from six weeks to six months across published protocols.[7] The operating surgeon's protocol should guide this decision.

Post-Operative Parameters

The following points are based on common recommendations across protocols. Specific parameters should always be confirmed with the operating surgeon.

Range of motion: Protocols vary considerably with regard to early range of motion — some limit flexion to 30–60° in the first week, progressing to 90° by six weeks; others permit 0–90° from the first two weeks.[7] [9][8][11] Range of motion is then gradually progressed, with the goal of near-full flexion by approximately three months.[11]

Weight-bearing: Weight-bearing is typically restricted in the early post-operative period to protect the graft.[8][7][12] The optimal timing for weight-bearing progression remains uncertain.[7]

Bracing: Initially, a knee brace locked in extension is used to prevent posterior tibial displacement. This is followed by progression to a functional brace, allowing general daily activities and eventually higher-level activities.[6] If available, dynamic PCL braces can be introduced early (days 3–4 post-operatively) — see Dynamic PCL Bracing below.

Dynamic PCL Bracing

Dynamic PCL braces have a spring-loaded cuff that runs around the back of the calf. They apply an anterior force to the tibia, preventing posterior sag. This allows the graft to mature in a shortened position, which may improve stability in the medium and long term.[8]

A dynamic PCL brace can be applied once post-operative swelling allows (typically within the first few days) and is worn full-time — including during sleep — for approximately six months; it is removed only for rehabilitation exercises. After six months, patients may transition to a functional PCL brace with a posterior support strap, typically worn for all activities for 12 months.[8]

Note: dynamic PCL braces may not be available in all settings and can be cost-prohibitive for some patients.[8]

Phased Rehabilitation

Post-operative rehabilitation following PCL reconstruction typically spans 9–12 months.[6][7] The following phases provide a general framework for rehabilitation planning. The phase structure and timeframes are approximate, drawn from different protocols, and will vary between patients. Progression must be guided by the operating surgeon's recommendations.

Phase I — Protection and Early Range of Motion (Weeks 0–6)

The goals of this phase are to restore joint homeostasis, manage the scarring process, protect the graft, begin restoring range of motion, and retrain the quadriceps.[6][8]

Oedema is managed with ice and elevation. Range of motion exercises are performed in prone to avoid posterior tibial sag. Quadriceps activation begins from day one (if there is no femoral nerve block), starting with quadriceps sets. Patellofemoral mobilisation is initiated early. Non-knee-dominant exercises such as calf raises and hip abduction can help maintain general conditioning.[8][9]

Phase II — Weight-Bearing Progression and Transition (Weeks 6–12)

This transitional phase bridges the gap between early protection and more active strengthening.[6] The focus is on increasing weight-bearing tolerance, progressing range of motion, and introducing early closed kinetic chain exercises in a limited range.[8][9][11] Stationary cycling may begin once flexion exceeds approximately 115°. Proprioception and balance training can also be introduced.[9]

Phase III — Strengthening (Weeks 12–22)

This phase focuses on building muscular endurance before progressing to strength training.[8] Because patients have had a prolonged period of reduced weight-bearing and restricted activity, there will be global atrophy of the affected limb. The strengthening programme should address the entire lower limb — gluteals, quadriceps, hamstrings, and calf — rather than focusing on any single muscle group.[8] Exercises such as squats, reverse lunges, leg press, single-leg squats, and Romanian deadlifts can be incorporated and progressed as appropriate. Exercises should progressively incorporate more functional, multi-joint movements.[8]

Phase IV — Power, Running Progression and Sport-Specific Training (Weeks 23–36+)

This phase develops muscular power, introduces a running progression for those whose goals require it (from approximately weeks 25–28), and progresses through speed and agility training toward a return to training.[8][9] Sport-specific skills are incorporated as the patient progresses.[8]

Return to Sport Criteria

There are currently no validated PCL-specific return to sport criteria, but criteria developed for ACL reconstruction have been applied to this population.[6][7][11]

Suggested benchmarks, adapted from ACL return to sport criteria, include:[8][11]

  • Quadriceps index > 90%
  • Hamstring strength symmetry between limbs
  • Single-leg hop testing, with a limb symmetry index of 85–90%[7]
  • Functional tests, such as the vertical jump and figure-8 run[6]

Return to sport exercises can usually begin around 6–7 months after surgery.[11] Full return to competitive sport typically occurs no earlier than 9 months post-operatively, and often closer to 12 months depending on the sport and the individual's progress.[9][11]

References

  1. ↑ Eberle C, Dan Milinkovic D, Achtnich A, Best R, Braun PJ, Eggeling L, et al. Treatment of isolated injuries of the posterior cruciate ligament-A 2025 Delphi-based structured expert statement by the ligament injury committee of the German Knee Society. Knee Surg Sports Traumatol Arthrosc. 2026 Jan;34(1):128-139.
  2. ↑ Pache S, Aman ZS, Kennedy M, Nakama GY, Moatshe G, Ziegler C, LaPrade RF. Posterior cruciate ligament: current concepts review. Arch Bone Jt Surg. 2018 Jan;6(1):8-18.
  3. ↑ Kondo E, Nishida Y, Joutoku Z, Kawamura D, Iwasaki K, Matsuoka M, et al. Double-bundle posterior cruciate ligament reconstruction procedure leads to better restoration of posterior knee laxity in isolated and multiple ligament knee injuries than single-bundle procedure. J Exp Orthop. 2025 Jun 5;12(2):e70295.
  4. ↑ Qi YS, Wang HJ, Wang SJ, Zhang ZZ, Huang AB, Yu JK. A systematic review of double-bundle versus single-bundle posterior cruciate ligament reconstruction. BMC Musculoskelet Disord. 2016 Jan 27;17:45.
  5. ↑ Migliorini F, Pintore A, Spiezia F, Oliva F, Hildebrand F, Maffulli N. Single versus double bundle in posterior cruciate ligament (PCL) reconstruction: a meta-analysis. Sci Rep. 2022 Mar 9;12(1):4160.
  6. ↑ 6.00 6.01 6.02 6.03 6.04 6.05 6.06 6.07 6.08 6.09 Gao S, Meng J, Zeng C, Monllau JC, LaPrade RF, Taft TN, et al. Management of posterior cruciate ligament injuries: an expert consensus from 17 countries. Int J Surg. 2025 Jun 1;111(6):4080-4085.
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 Senese M, Greenberg E, Todd Lawrence J, Ganley T. Rehabilitation following isolated posterior cruciate ligament reconstruction: a literature review of published protocols. Int J Sports Phys Ther. 2018 Aug;13(4):737-751.
  8. ↑ 8.00 8.01 8.02 8.03 8.04 8.05 8.06 8.07 8.08 8.09 8.10 8.11 8.12 8.13 8.14 O'Brien L. PCL Reconstruction Rehabilitation Course. Physiopedia Plus, 2019.
  9. ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 Sanford Health. PCL Reconstruction Rehabilitation Guideline. Available from: https://www.sanfordhealth.org/-/media/org/files/medical-professionals/resources-and-education/pcl-reconstruction.pdf (accessed 11 April 2026).
  10. ↑ The Ohio State University. Posterior cruciate ligament (PCL) reconstruction clinical practice guideline. Available from: https://medicine.osu.edu/-/media/files/medicine/departments/sports-medicine/medical-professionals/knee-ankle-and-foot/pcl-reconstruction_-2023.pdf?rev=e4df6fe6267347febb502390283e8cdf&hash=98FB281C05005F44CD480DB0637DA306 (accessed 11 April 2026).
  11. ↑ 11.0 11.1 11.2 11.3 11.4 11.5 11.6 Kew ME, Cavanaugh JT, Elnemer WG, Marx RG. Return to play after posterior cruciate ligament injuries. Curr Rev Musculoskelet Med. 2022 Dec;15(6):606-615.
  12. ↑ Martins FS, Cardoso Filho AT, Canuto SMG, Helito CP, Barroso BG, Rêgo MCF, et al. Double-bundle posterior cruciate ligament reconstruction using the rectus femoris graft-superficial layer of the quadriceps: surgical technique. Arthrosc Tech. 2025 Sep 19;14(11):103866.
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