Overuse Injuries - an Individualised Approach

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Introduction

Overuse injuries are a common phenomenon and challenging to assess and manage. Various factors contribute to the development of these type of injuries. The diagnosis, treatment and understanding why the injury occurred are some of the challenges that clinicians may deal with in the management of athletes with overuse injuries.

Definition of Overuse Injuries

Overuse injuries are characterised by the absence of a single, identifiable or traumatic cause. There is a gradual onset and injury is caused by repeated micro-trauma. The term "overuse" is used as the onset of these type of injuries are usually precipitated by a period of inappropriate tissue loading such as:

• Excessive magnitude or volume of load
• Insufficient recovery between bouts of load

Why Does Overuse Lead to Injury?

An overuse injury is usually caused by repetitive activities over a period. This repetitive microtrauma overloads the capacity of the tissue to repair itself. During exercise, the various tissues such as muscles, tendons, bones and ligaments, are being loaded and experience excessive physiological stress. After the specific exercise activity, the tissues undergo adaptation in order to strengthen and to be able to withstand similar stress in the future. If the adaptive capability of a specific tissue type is exceeded and injury occurs, this is most often an overuse injury. Therefore, in overzealous athletes, that do not allow adequate time for adaptation to occur before the next workout or training session, the cumulative tissue damage eventually exceeds the threshold that the tissue can handle and this causes pain and dysfunction.

Structures Affected by Overuse Injuries

• Bone
  • eg. bone stress injuries, stress fracture, osteitis, periostitis, apophysitis
• Tendons
  • eg. Tendinopathy
• Ligaments
  • eg. Medial ulnar collateral ligament injury in baseball pitchers
• Muscle
  • eg. Myofascial pain, chronic compartment syndromes, exercise-induced muscle soreness
• Bursa
  • subacromial bursa, greater trochanteric bursa
• Nerve
  • eg. nerve entrapment syndromes
• Cartilage
• Skin
  • eg. blisters

Risk Factors of Overuse Injuries

Training loads, intense competition schedules and inadequate or insufficient recovery are some of the factors that place athletes at higher risk for developing an overuse injury. Risk factors can also be classified according to intrinsic and extrinsic risk factors:

• Intrinsic Risk Factors
  • Malalignment issues, such as gena valgum or varum, patella alta, femoral neck anteversion
  • Leg length discrepancy
  • Muscle imbalance
  • Muscle weakness
  • Flexibility issues, such as generalised muscle tightness, restricted joint range of motion
  • Body composition

• Extrinsic Risk Factors
  • Training load errors, such as excessive volume, intensity, increase, inadequate recovery
  • Surfaces
  • Shoes
  • Equipment
  • Environmental conditions
  • Nutrition
  • Psychological factors

Physiotherapy and Overuse Injuries

Physiotherapists are advocates for physical activity and restoring the appropriate level of function in clients. This level of function is different for every client or athlete, and it is crucial that a customised and individualised approach is used. Ways to help athletes back to their highest level of function and return to play is by having good knowledge about the athlete’s specific sport and understanding the physical and psychological requirements of the sport. (Merike)

Patient education is important in the management of overuse injuries as well as the involvement of the multidisciplinary team and coaches. The treatment or intervention approach is based on managing the load and/or the forces that caused the injury so that the involved tissue has enough healing time, but also to build resilience against these forces. A helpful imagery to use educating patients about their overuse injury is the image of two tugboats pulling against each other. The green tugboat (good) will drive the overuse injury into healing and return to function or sport, whereas the red tugboat will draw the overuse injury away from healing and into more serious pathology. The key is to find the balance and fuelling the green tugboat with all the necessary interventions to facilitate healing, but not in a way that fuels the red tugboat and aggravates the pathology.

ADD image of tugboat

Assessment of Overuse Injury

Factors to consider in the assessment of an overuse injury:

Structure involved

The nature and severity of the injury

Duration of injury from onset of symptoms – this will aid in understanding the progression of pathology

Diagnosis of Overuse Injury

Clinical history

This is an important and valuable tool in the diagnosis of an overuse injury. Listen to what your client, the coach or other medical staff working with the athlete is telling you! Establish specific causative factors (intrinsic and extrinsic). Also consider the forces created on the structures when the athlete is not taking part in sport (such as housework, gardening) It is key to understand the total amount of forces created on the structure involved. Also consider certain populations more at risk of overuse injuries such as:

Children – the changing nature of training and competition in youth sports, combined with an immature musculoskeletal system

Female athletes – Red-s (Female triad)

Older athletes – factors such as bone density loss or old degenerative issues that may predispose to overuse injuries

Diagnostic Imaging

Plain Radiographs – to diagnose associated or incidental bony abnormalities

Ultrasound – effective imaging method for tendinopathies, although it is operator dependent

MRI

CT

Diagnosis

Identify the structure(s) involved, the nature and severity as well as the duration from onset. This will provide insight on the progression of the pathology. Early diagnosis significantly reduces the barriers to an optimal healing process.

Management of overuse injuries

A phase-appropriate intervention is necessary for the management of overuse injuries. Patients present at very points of progression in the pathology, some will present early on with an overuse reactions whereas others might have been struggling with an injury for much longer and the pathology of the injury is far more progressed. Treatment aims can include:

Identify and address the cause of injury

Reduce inflammation and pain

Promote healing

Prevent complications

Restore normal use of the injured area

Develop a return to play strategy, as dictated by symptoms

In short: Optimise tissue healing and systematically, gradually and optimally load the structures in order to provide restoration of function and capacity.

Treatment modalities may include:

Relative rest and avoidance of aggravating activities while maintaining fitness

Recovery protocols – cryotherapy and manual therapy techniques

Strengthening and rehabilitation

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