Right in the middle of your lower leg, there’s a essential bone called the tibia, also known as your shinbone. When it’s stressed beyond its limits, tiny cracks can start to form, leading to what’s known as a shin stress fracture. This type of injury is sneaky; it doesn’t come from a single, clear event like a fall or a blow, but rather happens over time from constant strain. This strain can come from activities like running on hard surfaces or suddenly increasing your workout intensity.

With a shin stress fracture, you might feel a nagging pain in your lower leg that gets worse with activity and eases up with rest. You could also notice swelling or tenderness along your shinbone. These fractures are tricky because they can start small and get worse over time if you ignore them.

Shin stress fractures needs careful attention and time to heal properly to make sure you can get back to your normal activities without pain. While shin stress fractures might sound less severe than other injuries, they’re quite common among athletes, especially runners. In fact, up to 20% of runners experience a stress fracture at some point in their training, with the tibia being one of the most common sites. They can significantly impact your ability to stay active and enjoy your favorite sports.

The Anatomy of your

Tibia (Shinbone):

This is the main bone in the front of your lower leg. It’s sturdy and bears the weight of your body, providing support and structure to your leg.

Fibula:

Running alongside the tibia is the fibula, a thinner bone that helps stabilize your ankle and support the muscles in your lower leg.

Muscles:

Several muscles are involved in the area around your shinbone. The most notable are:

  • Tibialis Anterior: This muscle runs down the front of your shin and helps lift your foot upward.
  • Soleus and Gastrocnemius (Calf Muscles): These muscles are located at the back of your lower leg and play a crucial role in walking, running, and jumping.
  • Extensor Digitorum Longus: This muscle helps extend your toes and also aids in lifting your foot.

Periosteum:

The periosteum is a thin layer of tissue that covers the surface of your bones, including the tibia. It’s rich in nerves and blood vessels, which is why a shin stress fracture can be quite painful.

Interosseous Membrane:

This is a fibrous sheet that connects the tibia and fibula. It helps distribute weight and force between the two bones.

When we talk about a shin stress fracture, we’re referring to a small crack in the tibia, often caused by repetitive stress and overuse. The muscles and other structures around the tibia play a role in absorbing and distributing this stress, but when they’re overwhelmed, it can lead to a fracture.

What does it do?

Stability and Protection

The shinbone (tibia) is the cornerstone of your lower leg’s stability. It’s like the main pillar holding up a building, providing a strong foundation for your leg. Just above your ankle, the tibia forms a joint with the fibula, creating a protective arch for the structures beneath, like the tendons and nerves that pass through to your foot.

Movement

Your tibia plays a crucial role in movement. It’s the bone that bears your weight when you stand and provides leverage for your muscles to move your foot and ankle.

Teamwork

The tibia doesn’t work alone. It teams up with the fibula, your calf muscles, and the ligaments in your ankle to provide a coordinated effort for walking, running, and jumping. This teamwork is essential for balanced and efficient movement.

Shock Absorber

Every step you take sends a shock up your leg, and your tibia helps absorb that impact, protecting your knee and hip from the jolt. It’s like the shock absorbers in your car that smooth out the bumps in the road, making for a more comfortable ride.

I have a … How did it happen?

Perhaps you’ve been increasing your running distance too quickly, and you start to feel a dull, aching pain in your lower leg. This could be the start of a shin stress fracture, a tiny crack in your tibia caused by repetitive stress.

The Support System

Your lower leg is supported by a network of muscles, tendons, and ligaments that all work together to keep your leg stable and moving smoothly. When a shin stress fracture occurs, this support system is put to the test. The muscles and tendons around the fracture site may tighten or become inflamed in an attempt to protect the injured bone, similar to how your body would react to a sprained ankle.

What Happens at the Injury Site

A shin stress fracture triggers several changes in your body:

  • Inflammation: Just like the swelling and redness that appear around a cut or scrape, inflammation occurs around the fracture site in your shin. This is your body’s way of starting the healing process, but it also leads to stiffness, swelling, and increased pain in the area.
  • Muscle Spasm: The muscles around the fracture may contract involuntarily to protect the injured area. While this is a natural protective mechanism, it can cause significant pain and limit your range of motion.
  • Bone Healing: Unlike a complete break, a stress fracture is a small crack in the bone. Your body will naturally try to heal this by forming new bone around the fracture site. However, this process can be slow and may require you to reduce your activity level to give your bone the rest it needs to heal properly.

All these factors – inflammation, muscle spasms, and the bone healing process – contribute to the pain and discomfort associated with a shin stress fracture. Understanding these responses can help you seek appropriate treatment and manage your symptoms effectively.

Causes of shin stress fractures

  • Overuse: Repetitive activities, especially in sports like running or dancing, can put continuous stress on your shinbone, leading to a stress fracture. It’s like bending a paperclip back and forth until it snaps; eventually, the bone gives in to the stress.
  • Sudden Increase in Activity: If you suddenly ramp up your exercise routine, like increasing your running mileage or intensity without proper conditioning, it can overwhelm your shinbone, causing a stress fracture.
  • Improper Footwear: Wearing shoes that lack proper support or cushioning can fail to absorb the impact on your legs, transferring excessive stress to your shins.
  • Hard Surfaces: Regularly running or exercising on hard surfaces like concrete can increase the risk of developing a shin stress fracture due to the increased impact on your lower legs.
  • Muscle Imbalances: Weakness in the muscles of your lower legs can lead to an uneven distribution of stress on your shinbone, making it more susceptible to fractures.
  • Bone Density Issues: Conditions that weaken your bones, such as osteoporosis, can make you more prone to stress fractures, even with normal levels of activity.
  • Previous Fractures: If you’ve had a shin stress fracture before, you’re at a higher risk of experiencing another one, as the bone may not be as strong as it was before the injury.

Symptoms of

Tests that you can do to see if you have a …

  1. Find a flat, stable surface to stand on.

  2. Shift your weight onto one leg, lifting the other off the ground.
  3. Gently bend the knee of your standing leg for stability.
  4. Begin to hop gently on the spot, maintaining your balance.
  5. Continue hopping for a few seconds, then stop.
  6. Repeat the test on the other leg for comparison.

If you experience sharp pain in your shin during or after hopping, it could indicate a stress fracture.

  1. Find a step or a raised surface that you can stand on.

  2. Stand on the edge of the step with your heels hanging off and your weight on the balls of your feet.
  3. Hold onto a railing or a wall for balance if needed.
  4. Quickly drop your heels down below the level of the step.
  5. Pay attention to any pain in your shins as your heels drop.
  6. Repeat the test a few times to confirm your findings.

If you feel a sudden, sharp pain in your shin when your heels drop, it could be a sign of a stress fracture.

  1. Sit or stand in a well-lit area where you can clearly see your shin.

  2. Examine the entire length of your shin, looking for any signs of swelling or bruising.
  3. Gently press along the shinbone to feel for any tender areas or bumps.
  4. Compare the appearance of both shins to see if there are any differences.
  5. Check for any warmth or redness in the area, which can be signs of inflammation.
  6. Repeat the check at different times of the day, as swelling can vary.

If you notice swelling, bruising, or tenderness in your shin, it could be an indicator of a stress fracture.

How severe is my….?

Mild

  • Grade 1 (Early Stress Reaction): You might feel mild discomfort or a dull ache along your shin after physical activity. There’s no visible swelling, and the pain usually subsides with rest. It’s like a warning sign that your shin needs a break.
  • Grade 2 (Stress Reaction): The pain becomes more noticeable, especially during or after a specific exercise like running. You might start to feel it at the beginning of your workout. There’s still no significant swelling, but the discomfort lingers a bit longer after you’ve stopped exercising.

Moderate

  • Grade 3 (Stress Fracture): Now, the pain is sharper and occurs during everyday activities, not just exercise. You might notice some swelling and tenderness along your shin. The pain doesn’t go away completely with rest anymore, and it might start to interfere with your daily routine.
  • Grade 4 (Severe Stress Fracture): The pain is intense and constant, even at rest. There’s visible swelling, and you might feel a specific spot of sharp pain when you press on your shin. Walking or any weight-bearing activity can be very painful, and you might start to limp.

Severe

  • Grade 5 (Complete Fracture): This is a full-blown fracture of the shinbone. You’ll experience severe pain, swelling, and possibly bruising. It’s almost impossible to put any weight on the affected leg without intense pain. You might see a noticeable deformity in your leg if the bone has shifted. Immediate medical attention is necessary.
  • Grade 6 (Complicated Fracture): In addition to the symptoms of a complete fracture, you might also have complications like nerve damage or issues with blood flow. The pain is excruciating, and the leg may look abnormal or misshaped. This grade requires urgent medical intervention and possibly surgery.

Diagnosis

Physiotherapy diagnosis

As experienced physiotherapists, we are dedicated to using a comprehensive and methodical approach to diagnose your shin stress fracture. Our objective is to precisely pinpoint the source of your lower leg pain and develop a customized treatment plan that fits your lifestyle.

The diagnostic process begins with a detailed exploration of your symptoms, including their onset, intensity, and factors that worsen or alleviate them. Following this, we conduct a thorough physical examination of your lower leg, which includes:

  • Palpation: We carefully examine the area around your shin for tenderness, swelling, or warmth, aiding in the differentiation between bone pain, muscle pain, or other types of pain.
  • Range of Motion Assessment: We assess the mobility of your ankle and knee, along with the flexibility of the surrounding muscles, to identify any limitations or asymmetries.
  • Strength Testing: We evaluate the strength of your lower leg, ankle, and foot muscles to detect any imbalances that could contribute to shin stress fracture risk.
  • Special Tests: We employ specific clinical tests designed to elicit your symptoms, assisting in the confirmation of a shin stress fracture. These tests include the Bump Test, where we gently tap the heel to see if it causes pain in the shin, and the Hopping Test, where we ask you to hop on one foot to assess if it provokes pain.

Based on the findings, your physiotherapist will discuss with you the most suitable treatment plan to effectively address your shin stress fracture. At Well Health Pro, we are committed to supporting you on your journey to recovery and helping you return to a pain-free daily life.

X-rays

X-rays are a crucial tool in diagnosing shin stress fractures. They help us visualize the bone structure of your lower leg and identify any disruptions or abnormalities. In the early stages of a stress fracture, X-rays might not show a clear break, but they can reveal changes in bone density or the presence of a fracture line as the condition progresses. We also look for periosteal reactions, which are signs of bone healing and can indicate a stress fracture.

If the X-ray results are inconclusive, we may recommend a CT scan or MRI for a more detailed view. Your physiotherapist can refer you to get x-rays taken if necessary.

Diagnostic ultrasound

CT scans are like a super-detailed X-ray that takes pictures of your lower leg from different angles. This helps us see your bones in 3D, which is really useful when we’re trying to spot a shin stress fracture. Sometimes, regular X-rays don’t show us everything we need to see, especially if the fracture is tiny. That’s where CT scans come in handy. They can show us even small breaks in the bone that we might miss on a regular X-ray. When we look at the CT scan images, we’re searching for any small cracks or changes in the bone that might be causing your pain. If we find something, it helps us figure out the best way to help you heal. While CT scans give us a clearer picture, they do use more radiation than regular X-rays, so we only use them when we really need to.

If you need an ultrasound, your physio will refer you.

MRI

MRI scans are a highly detailed imaging tool that provides comprehensive insights into the structures of your lower leg. Unlike X-rays and CT scans, which primarily focus on bones, MRI scans allow us to visualize both bones and soft tissues, including muscles and tendons. This is particularly useful for diagnosing shin stress fractures, as MRIs can detect subtle changes in the bone and surrounding tissues, even in the early stages of the fracture.

When evaluating a shin stress fracture with an MRI, we look for changes in the bone marrow and any abnormal signals that indicate a fracture. MRI scans are also excellent for differentiating stress fractures from other conditions, such as shin splints or muscle injuries.

If your physiotherapist suspects anything more than just a muscle spasm, you will be referred to the right specialist.

Why is the pain not going away?

Repetitive Stress and Incomplete Rest

Continuing high-impact activities without allowing adequate time for the shin to heal can lead to repetitive stress on the fracture site. This can prevent the bone from healing properly and may even worsen the fracture. It’s crucial to follow a structured rest and rehabilitation plan to ensure complete recovery.

Ignoring Biomechanical Issues

Underlying biomechanical problems, such as flat feet or overpronation, can contribute to the development of shin stress fractures. If these issues are not addressed, they can hinder the healing process and increase the likelihood of re-injury.

Delayed Bone Remodeling

The process of bone remodeling, where new bone tissue replaces old tissue, may be delayed due to factors like poor nutrition or inadequate blood supply to the affected area. This can slow down the healing process and prolong recovery time.

Neglecting Psychological Factors

The psychological impact of an injury, such as stress or anxiety about returning to activity, can affect the healing process. It’s important to address these concerns and ensure a positive mindset for a successful recovery.

Remember here, you don’t need to justify or explain. Only state the instruction. (Delete this text block)

What NOT to do

  • Continuous use of anti-inflammatory medication, as they are thought to delay healing

  • Manage the pain by only taking pain medication or muscle relaxants. You are only masking the symptoms of something more serious

  • Stretch through the pain

  • Walk, run, jog through the pain

  • Do not ignore back pain that gets worse (it could be an sign of a deeper problem)

  • Leave it untreated, if you are uncertain of the diagnosis, rather call us and be safe

What you SHOULD do

  • Rest as needed
  • Avoid activities that is flaring up your pain, like sitting for long hours or bending

  • Make a list of movement or activities that brings on your pain and rank them

  • Make an appointment to confirm the diagnosis and determine how severe the tissue damage is.

  • Finish your treatment and rehabilitation programme for better long-term results

Making it worse

  • Specific movements, positions or even sports that we know will definitely make it worse. Just mention the top culprits.

  • Bending down to tie shoelaces

  • Picking up your child

  • Climbing stairs

  • Walking uphill

  • Running

  • Deadlifts

  • Jumping

  • Wearing high heels

  • Driving

  • Working at your computer

Problems we see when patients come to us with …

Ignoring Early Symptoms

Many people brush off the initial discomfort of a shin stress fracture, thinking it’s just muscle soreness or fatigue. However, overlooking these early signs can lead to a worsening of the condition, turning a manageable issue into a more serious and painful fracture.

Overtraining

Athletes and fitness enthusiasts often push their limits, but failing to allow adequate recovery time can exacerbate a shin stress fracture. The constant stress on the bone without sufficient rest can prevent healing and increase the risk of a complete break.

Neglecting Proper Footwear

Wearing shoes that lack support or are worn out can put additional strain on your shins, worsening a stress fracture. It’s crucial to choose footwear that provides adequate cushioning and support, especially when engaging in high-impact activities.

Disregarding Cross-Training

Relying solely on high-impact exercises like running or jumping can increase the risk of shin stress fractures. Incorporating low-impact activities such as swimming or cycling can help maintain fitness while reducing stress on the shins.

Skipping Warm-Up and Cool-Down

Neglecting to properly warm up before exercise and cool down afterward can lead to muscle stiffness and increased strain on the shins. A good warm-up and cool-down routine can enhance blood flow and prepare your muscles for activity, reducing the risk of injury.

Ignoring Nutritional Needs

Poor nutrition, especially a lack of calcium and vitamin D, can weaken bones and make them more susceptible to stress fractures. Ensuring a balanced diet that supports bone health is essential for prevention and recovery.Repetitive Stress and Incomplete Rest:

Continuing high-impact activities without allowing adequate time for the shin to heal can lead to repetitive stress on the fracture site. This can prevent the bone from healing properly and may even worsen the fracture. It’s crucial to follow a structured rest and rehabilitation plan to ensure complete recovery.

Ignoring Biomechanical Issues

Underlying biomechanical problems, such as flat feet or overpronation, can contribute to the development of shin stress fractures. If these issues are not addressed, they can hinder the healing process and increase the likelihood of re-injury.

Neglecting Psychological Factors

The psychological impact of an injury, such as stress or anxiety about returning to activity, can affect the healing process. It’s important to address these concerns and ensure a positive mindset for a successful recovery.

Physiotherapy treatment

As experienced physiotherapists, we understand that a shin stress fracture can be a challenging and painful injury to recover from. We are here to support you and create a tailored treatment plan to guide you through your recovery. Our approach will focus on reducing pain and inflammation, improving mobility, and gradually building strength in your lower leg.

  • Manual Therapy: We’ll use hands-on techniques such as soft tissue mobilization to ease pain and enhance your shin’s range of motion.
  • Therapeutic Exercises: Together, we’ll work on specific exercises designed to strengthen the muscles supporting your shin and improve flexibility.
  • Activity Modification: We’ll guide you in modifying your daily activities and exercise routines to reduce stress on your shin and prevent further injury.
  • Pain Management and Education: Understanding your condition is key to managing pain effectively. We’ll provide you with the necessary information and recommend various pain relief strategies.
  • Other Effective Modalities: We may also incorporate pain management techniques such as dry needling and electrotherapy, which have been proven to aid in pain relief. If needed, we can use strapping or bracing to support your shin during the healing process.

Our goal is to help you return to your normal activities and exercise routine as safely and quickly as possible while minimizing the risk of re-injury to your shin.

Phases of rehabilitation

 

1st Phase: Acute Phase (0-2 Weeks)

In the acute phase, the focus is on reducing pain and swelling in the shin area using ice, compression, and elevation (RICE protocol). Physiotherapists may use gentle manual therapy techniques to maintain mobility in the ankle and knee joints and provide guidance on using supportive devices like a walking boot to protect the fracture site. Patients are typically non-weight-bearing, using crutches for mobility, and are instructed on performing gentle range of motion exercises for the ankle and hip to maintain circulation and prevent stiffness in adjacent joints..

2nd Phase: Early Mobilization (2-6 Weeks)

During early mobilization, the goal is to gently increase ankle mobility and begin restoring muscle strength around the lower leg. Physiotherapists introduce passive and active-assisted range of motion exercises for the ankle and isometric exercises for the calf muscles. Modalities such as electrical stimulation may be used to reduce pain and facilitate muscle activation. Partial weight-bearing may be initiated based on the doctor’s assessment, with continued use of supportive devices for protection.

3rd Phase: Progressive Strengthening (6-12 Weeks)

In the progressive strengthening phase, the focus is on increasing strength, stability, and range of motion in the ankle and lower leg. Physiotherapists incorporate more active range of motion exercises and progressive resistance exercises using bands or light weights. Closed kinetic chain exercises like seated calf raises and leg presses are introduced to safely build muscle strength. Weight-bearing is gradually increased, and patients are encouraged to engage in modified daily activities.

4th Phase: Advanced Strengthening (12-16 Weeks)

The advanced strengthening phase continues to build on strength and stability with a focus on functional movements. Physiotherapists introduce advanced strengthening exercises, including single-leg exercises and balance activities, to improve lower leg stability and function. Proprioceptive exercises are incorporated to enhance joint position sense and coordination. Full weight-bearing is typically allowed, and patients may begin to return to more demanding daily activities with attention to proper form.

5th Phase: Return to Activity (16-24 Weeks)

n the return to activity phase, the goal is to safely return to pre-injury levels of activity while preventing re-injury. Physiotherapists focus on sport-specific or activity-specific training, including agility and plyometric exercises, to prepare for a full return to recreational or occupational activities. Patients are guided on gradually returning to higher-impact activities, with emphasis on proper techniques to minimize the risk of re-injury.

6th Phase: Final medical clearance tests (Week

The maintenance and prevention phase aims to maintain lower leg function, strength, and stability and prevent future injuries. Physiotherapists encourage patients to continue with a regular exercise program that includes strength training, flexibility exercises, and cardiovascular fitness. Ongoing education on proper body mechanics and injury prevention strategies is provided to ensure long-term lower leg health and prevent future injuries. Patients should be able to fully participate in their desired activities with an ongoing commitment to maintaining lower leg health.

By now, you should be able to jump and throw, but there are some specific stress tests you should be able to do.

By now, you should be able to return to your routine. During the final week of your …….. treatment, we want you to be able to train at your full capacity. ………….. should be able to handle stretch stress, max load, and compressive forces.

So we can sign off on your recovery, knowing you’re safe.

Healing time

Based on the Fredericson MTSS classification system for shin stress fractures, the healing times will depending on the severity of the condition:

Early Stress Reaction (Grade 1)

Healing time is typically 2-4 weeks. With proper rest and modified activity, patients can expect a quick recovery. Physiotherapy may be needed to address any biomechanical issues and prevent recurrence.

Stress Reaction (Grade 2)

Healing time ranges from 4-6 weeks. Patients will need to limit weight-bearing activities and may require a protective brace or walking boot. Physiotherapy twice a week for the first two weeks is recommended to maintain mobility and strength in the surrounding muscles.

Stress Fracture (Grade 3)

The healing time extends to 6-8 weeks. Complete rest from high-impact activities is necessary, and a gradual return to weight-bearing exercises is guided by a physiotherapist. Treatment sessions may continue once a week after the initial two weeks to ensure proper rehabilitation.

Severe Stress Fracture (Grade 4)

Healing can take 8-12 weeks or longer, depending on the extent of the fracture. Non-operative treatment is essential, involving immobilization and a strict non-weight-bearing protocol. Physiotherapy is crucial throughout this period to prevent muscle atrophy and stiffness.

Complete Fracture or Complicated Fracture (Grade 5 or Grade 6)

These severe cases may require more than 3-4 months for complete healing. The treatment plan often involves an extended period of non-weight-bearing, followed by a carefully monitored rehabilitation program. Regular physiotherapy sessions are necessary to restore function and strength.

Other forms of treatment

  • Pain Medications: These can provide relief for shin stress fracture symptoms, but it’s important to get a proper diagnosis to avoid masking the severity of the injury. Medication should be used judiciously and under medical guidance as part of your recovery plan.
  • Corticosteroid Injections: While cortisone can temporarily reduce inflammation, swelling, and pain, its effects are short-lived. Repeated injections may also weaken bone and soft tissue integrity, so their use should be carefully considered.
  • Ice and Heat Therapy: These home remedies can effectively alleviate pain and swelling associated with shin stress fractures. However, their relief is temporary, and they should be used alongside a comprehensive treatment plan.
  • Biokineticist: A biokineticist can play a crucial role in rehabilitation, particularly in guiding you safely back to your exercise routine or sport following a shin stress fracture.
  • Chiropractic Care: While chiropractic adjustments can be beneficial for certain conditions, attempting to manipulate the area around a shin stress fracture is not advisable. It’s essential to address the fracture and any related soft tissue damage without causing further harm.
  • Supportive Devices: Using a walking boot or brace in the initial phases of a shin stress fracture can help immobilize the area and provide the necessary rest for healing. However, it’s important to have a plan in place to gradually reintroduce movement and strength to the affected leg to avoid dependence on the device and ensure a full recovery.

Is surgery an option?

Surgery for a shin stress fracture is considered when the fracture is severe, and conservative treatments haven’t worked, making it difficult for the lower leg to function properly. It’s also an option if the injury affects the stability and alignment of the tibia.

In the surgery, the doctor will make an incision near the shin to access the broken bone. They’ll then realign the fractured pieces. To keep everything in place, they might use metal screws, plates, or rods. After the surgery, the leg will need time to heal, and you’ll likely need physical therapy to regain your strength and mobility.

The goal of the surgery is to stabilize the bone so that your leg can bear weight and move smoothly without pain. It’s important to follow your doctor’s instructions after surgery to ensure proper healing of your shin.

What else could it be?

  • Medial Tibial Stress Syndrome (MTSS): Also known as shin splints, this condition causes pain along the inner border of the tibia. The pain is more diffuse and usually improves with rest, unlike the localized and persistent pain of a stress fracture.
  • Chronic Exertional Compartment Syndrome (CECS): This syndrome results in pain and swelling in the affected compartment of the leg, often accompanied by a feeling of tightness or pressure. The pain typically subsides with rest, distinguishing it from the constant pain of a stress fracture.
  • Tendinopathy (e.g., Tibialis Posterior Tendinopathy): Tendinopathy is characterized by pain and tenderness over the affected tendon, often worsened by specific movements. This differs from stress fracture pain, which is more related to weight-bearing activities.
  • Muscle Strains (e.g., Gastrocnemius or Soleus Strain): Muscle strains cause pain and tenderness within the muscle belly, with pain increasing during muscle contraction. This is distinct from the bone-related pain of a stress fracture, which is typically worse with impact and weight-bearing.
  • Popliteal Artery Entrapment Syndrome (PAES): PAES is marked by calf pain and claudication with exercise, often relieved by rest. Unlike a stress fracture, PAES may also present with decreased pulses in the foot and symptoms that are reproducible with specific leg positions or movements.

Also known as

  • Tibial Stress Fracture

  • Shinbone Fracture
  • Lower Leg Stress Fracture
  • Stress Fracture of the Tibia
  • Tibial Microfracture
  • Hairline Fracture of the Shin
  • Stress-induced Tibial Fracture
  • Tibial Fatigue Fracture
  • Shinbone Microfracture