PCL Reconstruction Recovery
Posterior Cruciate Ligament Reconstruction
What the operation does
The posterior cruciate ligament sits in the middle of the knee alongside the ACL and stops the shin bone sliding BACKWARD on the thigh bone. It is the thicker and stronger of the two. When it tears badly enough that the knee gives way or aches under load, it is replaced with a graft passed through tunnels in the bones and fixed at both ends, in the position the original ran.
How this differs from an ACL reconstruction
They are near mirror images, and almost every instruction that follows comes from that. The ACL stops the shin sliding forward; the PCL stops it sliding backward. So the forces you protect against are reversed, the muscles that help and hinder swap places, and the recovery is generally slower. If you know someone who had an ACL reconstruction, expect their advice to be wrong here more often than right.
Why gravity is the problem
This is the part with no equivalent after an ACL. When the knee is bent, the weight of your own shin pulls it backward — exactly the direction the new graft is there to resist. Left unsupported, the shin sags back and slowly stretches the graft out. That is why a special brace with a pad supporting the shin from behind is used, and why it is worn far more strictly and for longer than an ACL brace.
Why so many exercises are done face down
Lying on your front turns gravity into an ally: the weight of the shin falls forward, away from the graft, instead of backward against it. That is why the early programme leans on prone positions for both knee movement and hip work. It looks like an odd preference and it is a deliberate mechanical choice.
Why hamstring exercises wait
The hamstrings attach behind the shin and pull it backward — the same direction the injury took and the same direction the graft resists. So hamstring curls, which are safe from the start after an ACL reconstruction, are deliberately withheld here until around four months. It is one of the clearest examples of the two operations needing opposite advice.
The quadriceps is your protective muscle
The thigh muscle pulls the shin forward, which is precisely the direction that unloads the graft. Building it is not just general strengthening here; it is part of protecting the reconstruction. That is why quad work leads every early phase rather than sitting among other exercises.
Why many PCL injuries are never operated on
Worth knowing, because it explains why you may have waited. Isolated PCL tears often do well without surgery — the ligament has some capacity to heal in position, and a strong quadriceps compensates for a good deal. Surgery is generally reserved for knees that remain unstable, ache under load, or where other ligaments were injured at the same time. If yours was operated on, it was because the knee was not managing.
The brace
Expect to wear it longer than seems reasonable, often several months, and to be told to keep it on at night early. It is doing something specific — holding the shin forward against gravity — rather than simply limiting movement. It is the single instruction most worth following exactly, because a graft that stretches out gives back the instability the operation was for.
Weight through the leg
Usually restricted at first, commonly with the brace locked straight, and built up over the following weeks. Where other ligaments were reconstructed at the same time — which is common in PCL injuries — the restrictions are stricter and longer. Your surgeon's instructions are specific to what was done.
The graft gets weaker before it gets stronger
The same biology as any ligament reconstruction. The tendon is strongest the day it is fixed, then your body remodels it into a ligament over months, and during that process it is weaker than it started before slowly strengthening across the first year and beyond. Combined with the constant backward pull of gravity, that is why PCL timelines run longer than ACL ones.
Returning to running
Commonly somewhere between four and nine months, later than after an ACL reconstruction, and as a graded jogging progression once quadriceps strength and swelling allow. Downhill running and steep descents load the graft more and are usually reintroduced last.
Returning to sport
Usually nine to twelve months at the earliest and often longer, judged on strength testing rather than the calendar. Quadriceps strength compared with the other leg is the measure that matters most here, in the same way hop testing dominates ACL decisions.
Driving and work
For a right knee, driving generally waits until you are out of the brace for driving, off crutches, and could brake hard without hesitating — commonly around three months. A left knee in an automatic is much sooner. Desk-based work is often possible within one to two weeks; work on your feet commonly three to four months, and kneeling work later still.
How the recovery usually unfolds
The first two weeks are about swelling, waking the quadriceps up and getting the knee fully straight, with the shin supported. Two to six weeks brings controlled movement, much of it face down. Six weeks to four months is quadriceps-led strength building. Four to nine months brings running back and hamstring work is introduced. From nine to eighteen months the work becomes sport-specific, and return to pivoting sport commonly falls in the second year.
Staying in touch with your care team
PCL injuries vary enormously, and many involve more than one ligament — which changes this timetable substantially. Your surgeon knows what was reconstructed. If something about your recovery is worrying you or does not match what is described here, contact your care team — they would far rather hear from you.
Exercises for PCL Reconstruction
An illustrated, phase-by-phase exercise program for this procedure. View the PCL Reconstruction exercise program.
Recovery education · Condition guides · Exercise programs
Are you a clinician? See how orthopedic practices use JointBooklet.
This guide is general education and doesn't replace evaluation by a licensed provider. Recovery and treatment vary by person — follow the guidance of your own surgeon or care team.