The Knee and the Heel Hook: Hamstring Tears, Drop Knees and the Meniscus, and Knee Injuries from Bouldering Falls

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Your heel hook on the steep wall feels solid. You pull down with the heel and your hips come in to the wall. A second later there is a "pop" at the back of your thigh and you cannot put the leg down.

The previous post, Bouldering Falls and Ankle Injuries, covered injuries from falling. The knee is different: a large share of its injuries happen on the wall, from moves that are specific to climbing. This post covers four things: which moves cause climbing knee injuries, what a heel hook can damage, drop knees and the meniscus, and knee injuries from bouldering landings.

This is part 7 of the Climbing Injuries and First Aid series. For how to do the moves themselves, see Footwork and Turning and Twisting in the climbing movement series.

Which moves cause climbing knee injuries

Lutter et al. (2020) collected acute climbing knee injuries seen over 4 years at German sports medicine clinics: 71 patients, 77 injuries. They asked each person what move they were doing and grouped the answers into four:

Some findings:

• The most common structural damage was a medial meniscus tear, more frequent in non-competitive climbers than in competitors.
• A strain of the iliotibial band (the band of fascia along the outside of the thigh) during a heel hook is a climbing-specific injury.
• Nearly half (46.8%) happened in indoor bouldering.

This is a level 4 case series from specialist clinics, so milder injuries do not show up in it. In a 2016 paper, the same group says lower leg and knee injuries make up only 5.9% to 12.7% of the climbing injuries they see. Knee injuries are not common, but when they happen they can be serious.

Something you can do tonight: scroll through recent videos of problems you have climbed and count how often you heel hook, high step, and drop knee. Whichever you use most is the move to watch most closely as you read on.

What a heel hook can damage

Why the heel hook is different

Schöffl, Lutter and Popp's 2016 case series breaks the heel hook into two forces:

1. The heel presses on the hold, and the hamstrings (the muscles at the back of the thigh) bend the knee to pull the body toward the wall.
2. During the move, the knee is often rotated outward at the same time.

Together, these load the back and outside of the knee. The structures under strain include the lateral collateral ligament, lateral meniscus, posterior cruciate ligament, the tendons and capsule at the back of the knee, the iliotibial band, and the hamstring tendons.

What the 17 patients looked like

The paper follows 17 heel hook injuries seen at a sports medicine clinic in Bamberg, Germany, between 2010 and 2014:

• Where: 9 injured the knee, 8 the thigh or pelvis. At the pelvis, most were partial or complete avulsions of the hamstring tendon from its attachment; at the knee, most were lateral collateral ligament strains.
• Common symptoms: everyone felt sudden pain at the back of the knee, thigh, or pelvis during the heel hook, had difficulty walking, and was limping. Seven heard a snap.
• Few visible signs: only a few had minor bruising, and only one had a visible or palpable gap in the muscle.
• Outcome: 15 were treated conservatively with good to excellent results; 2 had surgery, one for a tendon avulsion and one for a meniscus tear. At follow-up of at least 6 months, all 17 were back at their pre-injury climbing grade.

Two points stand out. First, 11 of the 17 came for a second opinion. The authors say not every hospital is familiar with climbing-specific injuries like these, so the first diagnosis may be missed. Second, the authors say ultrasound does not always give a definitive diagnosis; pelvic avulsions are especially hard to see and cruciate ligament injuries cannot be seen at all, so they argue for MRI.

The clinic is mainly a referral centre, so severe cases are likely overrepresented. The authors recommend surgery for complete avulsions, but they state plainly that this is their personal preference, not evidence based, and should be decided together with the patient.

Rehab is not the same as for runners

Hamstring rehab usually centres on eccentric training, because sprinters are injured while the muscle is being lengthened. Ehiogu et al. (2020) point out that the heel hook demands high concentric strength, so eccentric training alone may not be enough. That is a note for the rehab team: plan post-injury training with a physiotherapist who understands climbing.

Something you can do tonight: before your first hard heel hook tonight, do two or three easy heel hooks on low, easy problems to get the back of the thigh moving. Schöffl and colleagues advise including the back of the thigh in your warm-up before "extreme" hooks. That is the authors' advice; the next section covers how far research supports it.

Prevention: how far the research goes

Schöffl 2016's prevention advice has two parts:

• Thigh and pelvis injuries: warm up the back of the thigh in particular, avoid muscle imbalances, and stretch and train flexibility. The authors themselves say whether tight muscles predispose to these injuries "cannot be answered yet," only that it "seems reasonable."
• Knee injuries: the authors say these do not come from tight muscles but from doing the heel hook "too ambitiously." The most effective prevention is making climbers and coaches aware of the injury pattern and that knee structures have limits.

Put that next to other research:

• Quarmby et al.'s 2023 systematic review found that warm-ups, cool-downs, and stretching were not associated with the risk of overuse injury in climbers. That review is about chronic overuse injuries, not acute injuries like a heel hook tear, so the two do not directly contradict each other. But it does mean "warming up and stretching prevents injury" is not a research finding at this point.
• Lutter 2020 concludes that climbing-specific awareness and training programmes should be developed. In other words, there is no validated prevention programme yet.

In practice, physiotherapists offer one technique cue. The Climbing Doctor's meniscus article advises keeping your toes in line with your thigh when heel hooking, drop kneeing, or high stepping. Control the move from the hips rather than leaving stability to the knee's ligaments. This is clinical experience, not tested by research.

Something you can do tonight: close to the ground, set up one drop knee and one heel hook, and look down to check whether your toes point the same way as your thigh. If your toes flare out and your knee twists in, make the move smaller first and build up.

Drop knees, high steps, and the meniscus

For how drop knees and high steps are done, see Turning and Twisting and Footwork.

In Lutter 2020, medial meniscus tears came mainly from high steps, drop knees, and heel hooks. According to the BSM Foundation's summary of the study, high step and drop knee injuries happened more often in rope climbing, while heel hook and fall injuries happened more often in bouldering.

The Climbing Doctor lists four common symptoms of a meniscus injury:

• Swelling in the knee a day or two after the injury
• Tenderness along the joint line on the inside or outside of the knee
• Popping or clicking when you move the knee
• Possible locking of the knee

The article says that if symptoms do not improve, the knee locks, or it feels unstable, you should see a physiotherapist or doctor. Hooper's Beta also says: if the knee catches or locks and you suspect a meniscus injury, see a professional.

Knee bars

Climbing magazine defines a kneebar as camming your foot and the top of your knee or thigh between two rock surfaces, for a rest or to save upper-body strength. There is no injury research on knee bars, so there are no numbers here. If any of the knee warning signs above appear, the same advice applies.

Something you can do tonight: think back over the past month. Was there a drop knee or high step after which your knee swelled the next day, or the joint line hurt when pressed? If so, stop doing that move and see a doctor or physiotherapist.

Knee injuries from bouldering landings

In Lutter 2020, ground falls accounted for 22.1% of mechanisms, and the BSM Foundation summary says anterior cruciate ligament (ACL) tears were mainly caused by falls.

Knee injuries from landings can be serious:

• Cruz et al.'s 2025 case series collected 19 people who injured a knee in a bouldering ground fall: 15 had a combined ACL and meniscus injury, and 18 had surgery. It is a small, single-centre sample.
• Abraham et al.'s 2025 case report describes a patient who ruptured the patellar tendon and injured several ligaments in a bouldering fall. The authors warn that these injuries often go undiagnosed and need prompt evaluation.

According to the BSM Foundation summary, to avoid reinjury Lutter's group recommends favouring rope climbing over bouldering to avoid falls and direct impact on the knee, and downclimbing or taking an easy way off the top rather than jumping. For downclimbing and landing technique, see the previous post.

Something you can do tonight: on your last problem tonight, downclimb the whole way instead of jumping.

When to see a doctor

With knee and hamstring injuries, it is hard to tell a strain from a tear yourself. If any of the following appear, see a doctor or physiotherapist:

• A dent or lump at the back of the thigh, plus bruising: Hooper's Beta's hamstring rehab article says this likely means a tear and you do not need to test further. A full tear or avulsion fracture warrants orthopaedic evaluation and may need surgery.
• A pop during a heel hook, then limping: all 17 patients in Schöffl 2016 fit this picture.
• A knee that catches, locks, or feels unstable: possibly a meniscus or ligament injury.
• A swollen knee you cannot walk on after a fall: emergency doctors use the Ottawa knee rule to decide on an X-ray. The criteria include tenderness of the kneecap or the head of the fibula, being unable to bend the knee to 90 degrees, and being unable to take four steps right after the injury. It is a clinical tool, not a self-diagnosis test.

If you are hurt at an outdoor crag, think about the walk out. Schöffl 2016 notes that all the heel hook patients were in a lot of pain and limping, so long hikes or descents may be difficult. The authors recommend elastic bandaging, splinting, and partial weight bearing with poles (for example ski poles) where possible. For crag self-rescue preparation, see Self-Rescue Basics in the C series.

For which specialist to see in Taiwan, see the series overview.

Something you can do tonight: save the four warning signs in this section to a note on your phone and share it with your climbing partners. In the moment of injury your head is at its least clear, and a list makes it easier to decide to get seen.

Practice: four scenarios

Each answer is below the question. Think first, then look.

1. You heel hook hard on a roof problem and feel a pop high at the back of your thigh, near your buttock. Now you are limping. A partner says: "It's just a strain, put some ice on it."

2. A doctor says it is a strain, but you are not convinced and want another opinion.

3. You have been drop kneeing a lot. For two weeks the inside of your knee has hurt along the joint line when pressed, and it occasionally catches when you bend it.

4. A friend says: "Research shows that stretching your hamstrings before a heel hook prevents injury."

What's next

The last stop in the legs is the foot itself. The next post, Feet and Climbing Shoes, covers what too-tight, too-downturned shoes do to your feet.

For the full picture of warm-up research, see Warming Up; for flexibility and injury, see Flexibility and Mobility.

References

• Lutter C et al. Mechanisms of Acute Knee Injuries in Bouldering and Rock Climbing Athletes. Am J Sports Med 2020;48(3):730–738
• Acute knee injuries in boulderers and rock climbers and how to avoid them (BSM Foundation)
• Schöffl V, Lutter C, Popp D. The "Heel Hook"—A Climbing-Specific Technique to Injure the Leg. Wilderness Environ Med 2016;27(2):294–301
• Geronikolakis S, Best R. Isolated rupture of the distal tendon of the biceps femoris muscle in a sport climber. Sportverletz Sportschaden 2012;26(2):114–116 (in German, English abstract)
• Ehiogu UD et al. Acute Hamstring Muscle Tears in Climbers—Current Rehabilitation Concepts. Wilderness Environ Med 2020;31(4):441–453
• Quarmby A et al. Risk factors and injury prevention strategies for overuse injuries in adult climbers: a systematic review. Front Sports Act Living 2023
• New Knee Pains for Climbers: How to Prevent and Recover from Meniscus Injury (Joshua Foster, The Climbing Doctor, 2022)
• How to Fix Lateral Knee Pain for Climbers (Hooper's Beta)
• Hamstring injury rehab for climbers (Jason Hooper and Emile Modesitt, Hooper's Beta, 2020)
• Cruz JK et al. Complex knee injuries from bouldering: A case series. J ISAKOS 2025;14:100995
• Abraham VM et al. Extensor Mechanism Disruption with Multiligamentous Knee Injury from Bouldering. Wilderness Environ Med 2025;36(3):368–372
• Climb Harder By Mastering Kneebars (Climbing Magazine, 2021)
• Ottawa Knee Rule card (Ottawa Health Research Institute, PDF)