Overview
A femoral stress fracture is a small crack or severe bone bruising within the thigh bone (femur), caused by repetitive mechanical stress rather than a single traumatic event. This type of bone injury is more common in athletes involved in high-impact, endurance sports such as long distance running, football, and long-distance walking, but can also occur in military personnel or individuals who have recently increased their training intensity too quickly.
While stress fractures can happen in various parts of the femur, the femoral neck (just below the hip joint) is the most commonly affected area and requires particular care due to the risk of complications if not diagnosed and managed appropriately.
Early identification is very important to avoid progression to a complete femoral neck fracture and to allow a safe and structured return to activity.
Anatomy of the Femur
The femur is the longest and strongest bone in the body, connecting the hip to the knee. It plays a crucial role in supporting your weight and enabling movement, particularly during activities like walking, running, and jumping.
A stress fracture occurs when repetitive strain overwhelms the bone’s ability to repair itself. Micro-damage accumulates over time, leading to a small crack or weakened area within the bone.
Stress fractures of the femur are typically categorised into:
- Femoral neck stress fractures – just below the ball of the hip joint
- Femoral shaft stress fractures – along the long part of the thigh bone
Both types can be very serious and require careful medical attention.
Mechanism of Injury
Femoral stress fractures occur due to repetitive loading of the bone without sufficient time for recovery.
They are often seen in people who:
- Increase their training volume or intensity too rapidly
- Have high intensity training schedules – Distance runners, triathletes, military recruits, and dancers
- Have poor biomechanics or muscle imbalances
- Have low bone density (osteopenia or osteoporosis)
- Follow restrictive diets or have nutritional deficiencies
- Are athletes with relative energy deficiency in sport (RED-S)
A lack of rest or recovery periods, particularly in endurance athletes or military trainees, can significantly increase the risk.
Symptoms and Presentation
The symptoms of a femoral stress fracture can be subtle at first, but they develop over time. It is really important that you don’t ignore these symptom, and seek medical help urgently.
Common symptoms include:
- Deep aching pain in the groin, hip, or thigh
- Pain that initially occurs only during exercise, but may later become constant, including at rest or at night
- A sensation of “dullness” or weakness in the leg
- Limping or difficulty bearing weight as the condition worsens
- Localised tenderness on palpation
Pain often worsens with running, walking uphill, or high-impact activity, and settles with rest. However, if left untreated, the condition can deteriorate and lead to a full fracture.
Diagnosis and Assessment
Because femoral stress fractures can be serious and are not always visible on standard X-rays in the early stages, a thorough and accurate diagnosis is essential.
At LBSM, your assessment will begin with a detailed clinical history and physical examination. We will consider your activity levels, training patterns, bone health, nutrition, and any relevant medical history.
To confirm the diagnosis, we may recommend one or more of the following imaging investigations:
- Clinical examination: Including assessment of pain on weight-bearing, hopping, or resisted hip movements
- Diagnostic ultrasound: To exclude soft tissue causes of hip/thigh pain
- MRI scan – the most sensitive and reliable way to detect a stress fracture early
- DEXA bone density scanning and blood tests – if underlying bone health issues are suspected
- X-ray – may be used to rule out other causes or to monitor healing in later stages
Our sports medicine team may also carry out blood tests to look at vitamin D levels, bone markers, or other nutritional deficiencies that could affect bone health.
Treatment Options
At London Bridge Sports Medicine, we take a holistic and multidisciplinary approach to managing femoral stress fractures, with a focus on non-surgical treatment wherever appropriate.
Summary:
- Complete rest from weight-bearing activities is recommended
- Crutches or a walking aid may be required for several weeks
- In high-risk fractures, referral to an orthopaedic surgeon may be needed to consider surgical fixation
- Low-risk fractures are typically treated conservatively with load modification monitoring, and rehabilitation.
Activity Modification and Rest
The first and most important step in treatment is to offload the bone, and stop all high-impact activity that could worsen the stress fracture. This includes running, jumping, and heavy weight-bearing exercise.
Depending on the severity of the fracture, you may even need to use crutches or a walking aid to significantly reduce the load on the affected leg.
Healing typically takes 6 to 12 weeks, but this can vary depending on the location and extent of the injury.
Physiotherapy
Once the fracture begins to heal, physiotherapy becomes a key part of rehabilitation. The specialist physiotherapists we work with will help you to:
- Address muscle imbalances or weaknesses that may have contributed to the injury
- Improve hip and core stability
- Progressively reintroduce loading through cross-training (e.g. cycling, swimming)
- Guide your safe return to running or sport using load management strategies
Rehabilitation is tailored to your sport, goals, and individual biomechanics.
Sports Podiatry
Biomechanical issues such as poor foot posture, excessive pronation, or leg length differences can contribute to stress fractures.
Our sports podiatrist, may assess your gait and recommend:
- Custom orthotics to improve shock absorption
- Footwear advice specific to your activity and gait
- Running analysis and retraining to reduce excessive forces through the lower limb
Nutrition and Bone Health
Bone healing requires optimal nutrition. Our sports nutritionist, can assess your dietary habits and provide support on:
- Adequate calcium and vitamin D intake
- Energy availability, particularly in female athletes or those at risk of RED-S
- Strategies to maintain bone, tendon and joint health long-term
- Improve your recovery and performance
Where needed, we can also coordinate DEXA scans or refer for specialist endocrinology input.
At LBSM we work closely with our multidisciplinary team to guide your recovery and rehabilitation and track your progress.
Sports Medicine Management
Our sports medicine doctors oversee your treatment plan and ensure all contributing factors are addressed. In some cases, we may consider:
- Bisphosphonate or vitamin D supplementation under medical guidance
- Low-intensity shockwave therapy to promote bone healing (in certain cases)
- Guided return-to-play protocols tailored to your sport and level of competition
Surgical intervention is rarely required but may be necessary in cases of displaced fractures or if conservative treatment fails. In these cases, we can refer you quickly to an orthopaedic surgeon with experience in sports injuries.
Outlook
Most femoral stress fractures heal successfully with early diagnosis, rest, and a structured rehabilitation plan. The outlook is generally good, but returning to sport too quickly or ignoring early warning signs increases the risk of serious complications, including a full fracture.
At LBSM, we aim to not only support your recovery but also identify and address any underlying issues, such as training errors, biomechanical problems, or nutritional gaps, to help prevent future injury and support long-term health and performance.
If you have persistent groin, thigh, or hip pain, particularly if you’re an active person or recently changed your training routine, don’t ignore it.
The team at London Bridge Sports Medicine is here to help.Get in touch to book an appointment or speak to a specialist.
