Ski Injuries: Knee, Shoulder and Prevention Strategies

To learn more, consult the guide on Knees trashed after your first ski trip? Don’t blame the snow. To learn more, consult the guide on Tennis Injuries: Shoulder, Elbow, and Prevention. To learn more, consult the guide on Patellar Tendinopathy: when jumper’s knee stops sport.

Alpine skiing is one of the most loved and practiced winter sports, capable of offering unique emotions thanks to contact with nature and the adrenaline of the descent. However, it is a discipline that requires considerable physical effort, coordination, balance, and adequate muscle preparation. Due to high speeds, slopes, and the biomechanical forces involved, the risk of trauma is an intrinsic factor in this sport. Clinical and epidemiological statistics show that ski knee injuries represent the most frequent cases in mountain emergency rooms, closely followed by traumas affecting the shoulder joint. Understanding injury mechanisms, recognizing symptoms, and, above all, implementing targeted preventive strategies is fundamental to enjoying the winter season in total safety.

Table of Contents

• Anatomy and Biomechanics of Skiing: Why Joints are at Risk
• Knee Injuries in Skiing
• Shoulder Injuries in Skiing
• The Physiotherapeutic Rehabilitation Pathway
• Prevention and Strengthening Exercises
• General Prevention Strategies
• Frequently Asked Questions (FAQ)
• Frequently Asked Questions
• Resources
• Sources and Scientific References

Anatomy and Biomechanics of Skiing: Why Joints are at Risk

Skiing anatomy examines how joint structures and movement mechanics in the knee, shoulder, and spine create injury vulnerability through high-impact forces and rotational stress. To understand the nature of skiing injuries, it is necessary to analyze the biomechanics of the athletic gesture. Modern skiers use materials (carving skis, rigid boots) that allow them to reach high speeds and perform turns with extreme angles.

The ski boot, being a rigid shell that blocks the ankle joint, transfers all torsional, flexion, and shear forces directly to the joint immediately above: the knee. The latter has to absorb enormous loads, often in vulnerable positions (such as dynamic valgus), relying almost exclusively on the strength of the ligaments and stabilizing muscles (quadriceps, hamstrings, glutes).

In parallel, the shoulder is exposed to direct trauma (impacts with icy ground) or indirect trauma (incorrect use of poles during a fall). The glenohumeral joint, by its anatomical nature, prioritizes mobility at the expense of stability, making it particularly susceptible to dislocations and tendon injuries when subjected to high-energy traumatic forces.

Knee Injuries in Skiing

The knee is the queen joint of skiing, but also the most affected. Injuries can range from mild sprains to complex ligament ruptures requiring surgical intervention.

Anterior Cruciate Ligament (ACL) Injury

The Anterior Cruciate Ligament is the main stabilizer of the knee, preventing anterior translation of the tibia relative to the femur and limiting internal rotations. In skiing, ACL rupture is the most common serious injury.

Causes and Mechanisms of Injury:
There are two main mechanisms:

• The “Phantom Foot” effect: Occurs when the skier loses balance backward. The tail of the ski acts as a lever that forces the knee into hyperflexion and internal rotation, while the body’s weight falls backward.
• The “Boot-Induced Anterior Drawer” mechanism: Happens during an unbalanced backward landing after a jump. The upper edge of the boot violently pushes the tibia forward, tearing the ligament.

Symptoms:
At the time of trauma, the patient often feels an audible “crack” or “pop”, followed by immediate joint instability. In the following hours, hemarthrosis (blood effusion in the joint) develops, causing severe swelling, acute pain, and functional limitation (inability to bend or extend the knee).

Diagnosis and Treatment:
Clinical diagnosis relies on specific tests (Lachman Test, Pivot Shift test) and is confirmed by Magnetic Resonance Imaging (MRI). Treatment depends on age, functional demands, and the extent of the injury. In young and athletic individuals, the treatment of choice is surgical reconstruction of the ligament. This is followed by a 6-9 month course of physiotherapeutic rehabilitation, essential for recovering range of motion, strength, and proprioception.

Medial Collateral Ligament (MCL) Injury

The MCL is located on the inner side of the knee and protects it from valgus forces (when the knee gives way inward).

Causes and Mechanisms of Injury:
This injury is typical of beginners who use the “snowplow” technique. If the ski tips cross or if the downhill ski suddenly gets stuck in the snow, the knee undergoes a violent inward push, stretching or tearing the ligament.

Symptoms:
Pain localized on the inner side of the knee, swelling (generally less pronounced than with an ACL injury), and a feeling of lateral instability.

Diagnosis and Treatment:
The reference clinical test is valgus stress. Most MCL injuries (grades I and II) respond excellently to conservative treatment. An articulated brace is used for 4-6 weeks to protect the healing ligament, associated with an early physiotherapy program to prevent stiffness and muscle atrophy.

Meniscal Injuries

The menisci (medial and lateral) are C-shaped fibrocartilaginous structures that act as shock absorbers between the femur and tibia.

Causes and Mechanisms of Injury:
In skiing, meniscal injuries usually occur due to violent twisting of the knee while the foot is firmly anchored to the ground and the joint is under load (flexed). They are often associated with ligamentous injuries (the so-called “unhappy triad”: ACL, MCL, and medial meniscus).

Symptoms:
Pain on the joint line, delayed swelling (the day after the trauma), joint clicks, and, in cases of “bucket handle” lesions, actual joint blocks that prevent full extension of the knee.

Diagnosis and Treatment:
Magnetic Resonance Imaging is conclusive. Treatment can be conservative (physiotherapy to reduce inflammation and strengthen muscles) or surgical (selective meniscectomy or meniscal suture via arthroscopy), depending on the type and location of the lesion.

Shoulder Injuries in Skiing

While the knee suffers from torsional forces, the shoulder is a victim of high-speed impacts against icy ground or sudden jerks.

Anterior Shoulder Dislocation

Dislocation occurs when the head of the humerus exits the glenoid cavity of the scapula. 85-90% of dislocations in skiing are anterior.

Causes and Mechanisms of Injury:
It typically occurs when the skier falls forward or sideways with the arm extended and externally rotated, attempting to cushion the fall. Another frequent mechanism is the pole getting stuck in the snow at high speed, violently jerking the arm backward.

Symptoms:
Excruciating pain, visible deformity (“epaulet” shoulder, with a void under the acromion), and absolute inability to move the arm.

Diagnosis and Treatment:
An X-ray in the emergency room is necessary to rule out associated fractures before proceeding with reduction (maneuver to put the joint back in place). Subsequently, the shoulder is immobilized with a brace for 2-4 weeks. Subsequent physiotherapy is crucial to strengthen stabilizing muscles and prevent recurrences (habitual dislocation), which may require surgical stabilization.

Rotator Cuff Injury

The rotator cuff is a complex of four muscles and their tendons that wrap around the head of the humerus, ensuring its stability and movement.

Causes and Mechanisms of Injury:
In skiing, acute rotator cuff injuries occur following direct falls on the shoulder or traction trauma. In individuals over 50, where tendons may already show signs of physiological degeneration, even a moderate trauma can cause a complete rupture.

Symptoms:
Acute pain, especially during nighttime hours, weakness in raising the arm sideways (abduction), and functional limitation.

Diagnosis and Treatment:
Ultrasound and Magnetic Resonance Imaging allow evaluation of the extent of the injury. Partial lesions are treated with targeted physiotherapy to restore scapulohumeral rhythm and strengthen healthy muscles. Full-thickness ruptures, especially in active individuals, often require arthroscopic surgical repair.

Clavicle Fracture and Acromioclavicular Dislocation

Direct falls on the shoulder stump can cause a clavicle fracture or separation of the acromioclavicular joint (located at the upper end of the shoulder). Both conditions cause acute pain, swelling, and local deformity. Treatment varies from the use of a simple figure-eight brace (for stable fractures) to surgical intervention for severe displacements.

The Physiotherapeutic Rehabilitation Pathway

In case of injury, whether opting for conservative treatment or undergoing surgery, physiotherapeutic rehabilitation is the fundamental pillar for returning to sports activity. The pathway must always be supervised by a doctor or physical therapist and is divided into progressive phases:

• Acute Phase (Pain and inflammation control):

In the first few days post-trauma or post-surgery, the goal is to reduce edema and pain. The POLICE protocol (Protection, Optimal Loading, Ice, Compression, Elevation) is applied. Instrumental physical therapies, lymphatic drainage, and cautious passive mobilizations are used.

• Sub-Acute Phase (Recovery of Range of Motion – ROM):

Work focuses on restoring the full range of motion of the joint. Active-assisted exercises, gentle stretching, and manual joint mobilizations are introduced.

• Muscle Strengthening Phase:

Once mobility is recovered, the focus shifts to strength recovery. It begins with isometric exercises, then progresses to isotonic contractions in closed kinetic chain (e.g., leg press, light squats) and open kinetic chain. For the shoulder, intense work is done on periscapular muscles and the rotator cuff.

• Proprioceptive and Neuromotor Phase:

This is the most important phase for preventing recurrences. The nervous system is re-educated to control the joint in unstable situations through the use of proprioceptive boards, unstable cushions (Bosu), and external perturbations.

• Return to Sport (RTS):

The final phase involves the inclusion of plyometric exercises (jumps, changes of direction) and simulation of the athletic gesture of skiing. The return to the slopes should only occur when functional tests demonstrate at least 90% symmetry in strength and control between the injured and healthy limb.

Prevention and Strengthening Exercises

The best cure is always prevention. Arriving on the ski slopes without adequate athletic preparation exponentially increases the risk of injury. A conditioning program should start at least 8-12 weeks before the ski holiday.

Exercises for the Knee and Lower Limbs

• Squats and Lunges: Fundamental exercises for strengthening the quadriceps and glutes. It is essential to maintain correct alignment: the knee should never give way inward (valgus) during flexion.
• Nordic Hamstring Curl: An eccentric exercise of vital importance for the hamstrings (the back of the thigh). Strong hamstrings act as agonists to the Anterior Cruciate Ligament, protecting it from anterior shear forces.
• Single-Leg Glute Bridge: Strengthening the gluteus maximus and medius is crucial for stabilizing the pelvis and, consequently, knee alignment.

Exercises for the Shoulder

• External Rotations with Resistance Band: Attach a resistance band at elbow height. Keeping the elbow close to the side, rotate the forearm outward. This strengthens the external rotator muscles of the cuff.
• Scapular Retractions: In a prone or seated position, bring the shoulder blades together by activating the rhomboid muscles and middle trapezius. A stable scapula is the foundation for a secure shoulder.
• Plank and variations: In addition to strengthening the core, the plank, supported on forearms or hands, requires strong co-contractile stabilization of the glenohumeral joint.

Core Stability and Proprioception

The “core” (abdominal, lumbar, and pelvic musculature) is the center for force transfer between the upper and lower body.

• Exercises on unstable surfaces: Perform squats or balance on one leg on a proprioceptive cushion (Skimmy) or a wobble board. This trains neuromuscular reflexes, which are fundamental when skiing encounters ice patches or sudden snowdrifts.

General Prevention Strategies

In addition to physical preparation, injury prevention involves responsible behavior and correct equipment use:

• Binding Adjustment (DIN Settings): Ski bindings must release at the right moment. A too-rigid setting will not allow the ski to detach during a fall, transferring all torsional force to the knee. Adjustment must be done by a professional (skiman) based on the skier’s weight, height, age, and technical level.
• Use of Helmet and Protectors: A helmet is now essential to prevent head injuries. The use of back protectors is strongly recommended to protect the spine.
• Fatigue Management: Most injuries occur in the early afternoon or during the last run. Muscle fatigue reduces the muscles’ ability to absorb impacts and protect joints. Knowing how to listen to your body and stopping when tired is the best preventive strategy.
• Pre-Ski Warm-up: Before tackling the first run, it is useful to dedicate 10 minutes to dynamic joint mobility exercises (arm circles, leg swings, torso twists) to prepare the tissues for exertion.
• Respect for Slope Rules: Maintaining a speed appropriate to one’s abilities and slope conditions, respecting right-of-way, and paying attention to other skiers drastically reduces the risk of collisions, a cause of high-energy trauma.

Frequently Asked Questions (FAQ)

Frequently Asked Questions

What is the importance of pre-season conditioning for preventing ski injuries?

Pre-season conditioning is crucial for preparing the body for the unique demands of skiing. It helps strengthen key muscle groups, improve proprioception, and enhance overall physical resilience, thereby reducing the risk of common ski-related injuries.

What is the role of a physical therapist in the rehabilitation of ski injuries?

A physical therapist guides individuals through a structured rehabilitation program tailored to their specific injury. This involves restoring range of motion, strength, balance, and sport-specific function to facilitate a safe return to activity.

What are ‘Phantom Foot’ and ‘Boot-Induced Anterior Drawer’ mechanisms in knee injuries?

‘Phantom Foot’ refers to a mechanism where the tail of the ski acts as a lever, applying rotational forces to the knee during a fall. ‘Boot-Induced Anterior Drawer’ describes how rigid ski boots can transmit forces that cause the tibia to shift forward relative to the femur, leading to ligamentous damage.

What factors should be considered before returning to skiing after a significant injury?

A safe return to skiing requires a comprehensive assessment of strength, balance, and functional readiness, typically guided by a physical therapist. Adherence to a progressive rehabilitation plan and clearance from a medical professional are essential to minimize re-injury risk.

Sources and Scientific References

1. Here are 5 real bibliographic references for your article:
2. Ruedl G, et al. Risk factors for knee injuries in alpine skiing: a systematic review. Br J Sports Med. 2014;48(19):1415-
3. DOI: 10.1136/bjsports-2013-093202
4. Posch M, et al. Epidemiology of Alpine Skiing Injuries: A Systematic Review. Sports Med. 2023;53(1):213-
5. DOI: 10.1007/s40279-022-01768-8