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How long does a torn ligament take to heal in knee?

By George Thomas. Published 8 October 2026, updated 8 October 2026. Label figures and prices checked on the update date.

The short answer

By what you want back. Medial collateral in a brace: walking in days, stairs and driving in two to three weeks, running at six, sport at eight to twelve by tests. Posterior cruciate: a month or two longer. Cruciate reconstruction: a year.

  • Medial collateral, hinged bracewalking within days to a fortnight; stairs and driving in two to three weeks; straight running around six weeks; cutting and sport at eight to twelve weeks by tests; every grade heals without surgery
  • Isolated posterior cruciate, bracea similar scale stretched by a month or two; straight running around three months; sport around four to six months
  • Anterior cruciate reconstructionwalking in a week or two; driving at two to six weeks by side; straight running at three to four months; cutting at six to nine; pivoting sport at nine to twelve by strength and hop tests
  • Lateral collateral and posterolateral cornerusually surgical and often combined; runs on the cruciate's scale; every date a typical passing point at a test, not a release date
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Our brand: the worked example on this page

Futuro Labs Marine Collagen

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View on Amazon UK, £16.99 Full label breakdown

The adjunct beside the quadriceps and loading work that passes the gates, on its true terms: Futuro Labs Marine Collagen on Amazon UK, 2 capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C at 15% NRV plus zinc, 120 for £16.99, 28p a day, lab tested and UK made, below the 5g ligament trial dose and holding no ligament claim. Full label breakdown. Which ligament first is on the knee ligaments page; the two knee ligaments compared on the ligaments fully heal page; the knee's structures sorted on the collagen and knee repair page.

Six things a reader wants back, and when the medial collateral and the posterior cruciate give them

How long does a torn ligament take to heal in knee is a question that is usually answered with a timetable by ligament, so many weeks for this one and so many months for that, and the honest page answers it differently, by the six things a reader actually wants back, because a knee has four ligaments on four timetables and nobody experiences a timetable; they experience the morning they walk to the kitchen without a crutch, the day they drive again, the first flight of stairs without the rail, the first straight run, the first cut, and the first match, and each knee ligament returns those six things on its own schedule, which the page gives in order, with every date a typical point at which a tested knee passes and not a date on which a knee is released. The medial collateral ligament comes first because it is the commonest knee ligament injury and the kindest. The inner-side strap, torn when the knee is forced inward by a tackle from the outside or a ski that catches, lies outside the joint in well-supplied tissue with its ends held close by the knee's shape, and it heals without surgery in every grade under a hinged brace that stops the knee opening sideways and progressive loading from the first days, which is why which ligament first is the question on the knee ligaments page. It gives back walking unaided within days for a grade one and within a fortnight for a grade two or three, in the brace, as the swelling falls and the bridge forms; stairs without a rail and driving within two to three weeks, as the range returns and the quadriceps wakes up, with driving depending on which knee and whether the car is automatic; running in a straight line at around six weeks, when the scar has reached a third to a half of its eventual strength and bears the cyclic load of a jog; and cutting, pivoting and a return to sport at around eight to twelve weeks, decided by tests, quadriceps and hamstring strength within a margin of the other side and single-leg hops matched to it, with a brace often worn for the first season back; a grade one is back to sport in two to three weeks and a grade three toward the twelve. The posterior cruciate ligament is the knee's second kindest, a fact that surprises readers who hear the word cruciate. Torn when the shin is driven backward, a dashboard in a collision or a fall onto a bent knee, an isolated posterior cruciate tear is managed in a brace that holds the shin forward so the torn ends meet, and it heals in many cases on a scale like the medial collateral's stretched by a month or two: walking in the brace within a fortnight, stairs and driving over three to four weeks, straight running at around three months, and sport at around four to six months by tests, with quadriceps strength the particular emphasis because the quadriceps pulls the shin forward and does the ligament's job while it heals; a posterior cruciate torn with other ligaments is a surgical knee on the longer scale below.

When the anterior cruciate gives them, reconstructed or not, the lateral side's scale, why every date is a gate and not a release, and the adjunct

The anterior cruciate ligament is the knee ligament the question is most often about, and it gives the six things back on the longest scale, for the reason the two knee ligaments compared on the ligaments fully heal page set out: its torn ends retract into synovial fluid, it does not heal to a functional ligament unaided outside the deep-flexion protocol still under study, and most people who want a knee that pivots have it reconstructed with a graft that then takes a year to become a ligament. A reconstruction gives back walking unaided within a week or two, the crutches set aside as the swelling settles and the quadriceps fires; driving at around two weeks for a left knee in an automatic car and four to six weeks for a right knee, when the leg can brake hard without hesitation; stairs without a rail within the first weeks, descending later than ascending; running in a straight line at around three to four months, once the graft has anchored in its tunnels, the knee has full range and the quadriceps is within a margin of the other side, since running on a weak quadriceps overloads the healing graft; cutting and change of direction at around six to nine months, as the graft matures and the hop tests are passed; and pivoting and contact sport at nine to twelve months, by a battery of tests, strength within ten percent of the other side, hop tests matched, and the sport's movements rehearsed under control, with the re-tear rate highest in those who return before nine months and before passing the tests, and the risk to the other knee's cruciate as high as the risk to the reconstructed one. The non-operative path for a cruciate tear, chosen by those who do not need a pivoting knee or whose knee proves stable enough under rehabilitation, gives back walking and straight running sooner, since there is no graft to protect, and gives back cutting only to the minority whose knee does not give way on it; the knee's structures and what each needs are sorted on the collagen and knee repair page. The lateral collateral ligament and the posterolateral corner, the outer-side structures, are torn less often, usually with other ligaments, do not stay approximated when completely torn and are usually repaired or reconstructed, running on the cruciate's scale with the same six things returned in the same order over the same nine to twelve months. Every date on this page is a gate and not a release, and the honest page says why: the dates are typical points at which a knee that is tested passes the test, strength and hop against the other side, range, swelling settled, the sport's movements under control, and a knee that is released on the date without the test is the knee that re-tears, because the pain's clock stops months before the scar's or the graft's, and the dates are where the clocks usually meet, not a substitute for checking that they have. The floor runs under all four ligaments, protein at 1.6 to 2 grams per kilogram, vitamin C, sleep, no smoking, and body weight, which adds several kilograms across the knee per step for each kilogram carried. Collagen's one ligament trial was in ankles, 5g a day for six months in athletes with chronic ankle instability, with no knee ligament trial of any kind, so the adjunct sits beside the quadriceps and loading work that passes the gates at the trial's powder dose, if anywhere. The worked example is that adjunct at habit scale, stated on its true terms: two capsules, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C at 15% of its reference value plus zinc, 120 for £16.99 at 28p a day, lab tested and UK made, below the 5g trial dose, carrying vitamin C's collagen formation sentence for cartilage and bones and no ligament claim. How long does a torn ligament take to heal in knee: by what the reader wants back, from days for walking after a medial collateral tear to a year for pivoting sport after a cruciate reconstruction, with every date a test to pass rather than a day to wait for.

Six things a reader wants back after a knee ligament tear, and when each ligament typically gives them, by tests
What you want backMedial collateral, hinged braceIsolated posterior cruciate, braceAnterior cruciate reconstruction; lateral collateral and posterolateral corner repair
Walking unaidedDays for a grade one; within a fortnight for a grade two or three, in the braceWithin a fortnight, in the braceWithin a week or two as swelling settles and the quadriceps fires
DrivingTwo to three weeks, by side and transmissionThree to four weeksAround two weeks for a left knee in an automatic; four to six for a right knee
Stairs without a railTwo to three weeksThree to four weeksWithin the first weeks; descending later than ascending
Running in a straight lineAround six weeks, when the scar reaches a third to a half of its strengthAround three monthsThree to four months, with the graft anchored and the quadriceps near the other side
Cutting and pivotingEight to twelve weeks by strength and hop tests; grade one soonerFour to six months by testsSix to nine months as the graft matures and hop tests are passed
Contact or the sport itselfEight to twelve weeks by tests; a brace for the first seasonFour to six months by testsNine to twelve months by a test battery; re-tear highest before nine months and without the tests
Why every date is a gateThe pain's clock stops months before the scar'sThe quadriceps does the ligament's job while it healsThe graft takes a year to become a ligament; the other knee is at risk too
The worked exampleOursBeside the loading and quadriceps workTwo capsules, 1200mg marine collagen with 12mg vitamin C plus zinc, 28p a dayBelow the 5g ankle trial dose; no knee ligament trial exists; no ligament claim

What to check on the label

  • Ask what you want back: walking, driving, stairs, straight running, cutting, the sport.
  • Place your ligament: medial collateral in weeks, posterior cruciate in months, cruciate reconstruction in a year.
  • Treat every date as a gate: strength and hop tests against the other knee.
  • Build the quadriceps: it does the ligament's job while the ligament heals.
  • Keep the floor: protein, vitamin C, sleep, no smoking, body weight; collagen beside the work, on its true terms.

Our brand

The worked example: Futuro Labs Marine Collagen

Futuro Labs Marine Collagen: 2 capsules daily, 1200mg hydrolysed type 1 marine collagen with 12mg vitamin C and 1.5mg zinc (15% NRV each), 120 capsules for £16.99, 60 days at 28p a day, lab-tested, UK GMP made. Slim veggie-shell capsules, odour free. Fish derived: pescatarian, not vegetarian or vegan.

Collagen per serving
1200mg hydrolysed type 1 marine (fish)
Co-factors
vitamin C 12mg (15% NRV), zinc 1.5mg (15% NRV)
Serving
2 capsules a day
Bottle
120 capsules, 60 days
Price
£16.99 (28p a day)
Capsule
slim size 00, veggie shell, odour free
View on Amazon UK, £16.99 Full label breakdown
Futuro Labs Marine Collagen, 120 capsule bottle

Questions people also ask

How long does an MCL tear take to heal?

The medial collateral heals without surgery in every grade under a hinged brace: walking unaided within days to a fortnight, stairs and driving in two to three weeks, straight running at around six weeks when the scar reaches a third to a half of its strength, and cutting and sport at around eight to twelve weeks by strength and hop tests, with a grade one back in two to three weeks and a grade three toward twelve.

How long after ACL surgery can I run?

Straight running typically at around three to four months, once the graft has anchored in its bone tunnels, the knee has full range and no swelling, and the quadriceps is within a margin of the other side, since running on a weak quadriceps overloads the healing graft; cutting follows at six to nine months and pivoting sport at nine to twelve, by a battery of strength and hop tests rather than by the calendar.

Can a torn knee ligament heal without surgery?

The medial collateral in every grade and many isolated posterior cruciate tears heal under a brace and loading because their ends stay in contact; the anterior cruciate does not reliably heal to a functional ligament unaided, outside a deep-flexion protocol still under study, and is reconstructed in those who need a pivoting knee or managed non-operatively in those who do not; the lateral collateral and posterolateral corner are usually repaired when completely torn.

How long does a torn knee ligament take to heal without surgery?

For the medial collateral, days to a fortnight to walk, six weeks to run and eight to twelve weeks to sport by tests; for an isolated posterior cruciate, a fortnight to walk, three months to run and four to six months to sport; for a non-operative anterior cruciate, walking and straight running return sooner than after reconstruction and cutting returns only to the minority whose knee does not give way on it.

Does collagen help a torn knee ligament heal?

There is no knee ligament trial of collagen: the one ligament trial gave 5g a day for six months to athletes with chronic ankle instability and improved a stability score and sprain counts in lax, long-healed ankle ligaments, so the adjunct sits beside the quadriceps and loading work that passes the knee's gates at the trial's powder dose, if anywhere, and the worked example at 1200mg is below that dose and holds no ligament claim.

Sources

  1. The knee ligament healing literature: the medial collateral ligament heals well without surgery in most grades under bracing and progressive loading, the lateral collateral and posterolateral corner often require repair when completely torn, the posterior cruciate heals with bracing in many isolated tears, and the anterior cruciate does not reliably heal to a functional ligament on its own, with reconstruction or structured rehabilitation decided case by case and an emerging bracing protocol under study. PubMed record
  2. The anterior cruciate ligament healing literature: a complete tear usually fails to heal because the retracted ends sit in synovial fluid, but a bracing protocol holding the knee in deep flexion for several weeks to bring the torn ends together has reported healing on magnetic resonance imaging in a majority of a selected series, with longer-term outcomes and randomised comparison against reconstruction still awaited, so that the ligament's failure to heal reflects its environment rather than an inability of ligament tissue to repair. PubMed record
  3. The ligament scar maturation studies: in the animal medial collateral ligament model, the healing scar bridges the gap within two weeks but has a small fraction of normal failure load, reaches roughly a third to a half of normal by six weeks and continues to strengthen for a year or more without reaching the original, with the early scar made of small-diameter type III rich fibrils that are gradually replaced by larger type I fibrils under load. PubMed record
  4. The post-traumatic osteoarthritis literature: around half of people who tear an anterior cruciate ligament or a meniscus show radiographic knee osteoarthritis ten to twenty years later whether or not the ligament was reconstructed, with the joint injury at the moment of the tear, altered loading, muscle weakness and body weight as the drivers, and quadriceps strength, body weight control and continued activity as the modifiable factors; chronic ankle instability after repeated sprains likewise raises the risk of ankle osteoarthritis over decades. PubMed record