Osgood Schlatter Disease (OSD)
Osgood Schlatter Disease (OSD) is a growth related disease located at the knee within the similar entity of growth related disease as severs developing at the hind aspect of the heel. OSD involves the development of apophysitis (irritation at the growth plate between the tibial tuberosity and main tibia bone) at top and central part of the tibia known as the tibial tuberosity. Tibial tuberosity is a primarily fibrocartilaginous structure during the early development stage (<8yrs girls, <9yrs boys) which undergoes the process of ossification (laying down of bone) between the ages of ~8-14 with the presence of an growth plate between the tibial tuberosity and the tibial metaphysis (head). Complete ossification or fusion of previous growth plate (complete bony fusion between tibial tuberosity and tibial shaft ends) to form one complete bone is expected to have taken place by around the age of 15+ year for girls and 17+ years for boys.
Onset is insidious with a gradual worsening presentation without trauma common during the years 9-17 years for males and 8-15 years for females whereby skeletal immaturity coincides with adolescent growth spurts or peak growth years being 11-15 years for girls and 13-16 years for boys. Prevalence rates of the disease during the peak growth years range from 9-12% of children.
OSD develops on the background of increased patella tendon traction on the tibial tuberosity secondary to the lag between increased bone growth (femoral shaft lengthening) and tendon and muscle lengthening adaptation resulting in increased traction stress at the growth plate leading irritation within this region termed ‘apophysitis’.
Imaging is not a routine requirement as part of diagnosing OSD with a thorough clinical examination generally providing enough conclusive information necessary to make the diagnosis. There is a strong association with the development of OSD within a short time period during or post a peak growth period, sudden increase volume of physical activity or introduction to those sports such as football, gymnastics or netball/ basketball. Sports which require repeat jumping, landing, change of direction, acceleration or deceleration or sustained periods of sprinting components across a continuous period (half or quarter). Symptoms generally present below the patella with a focal distribution around the patella tendon and insertion in the tibia. Acute symptoms will generally subside with a period of rest ranging from minutes through to 24 hours dependent on severity of ‘apophysitis’ present. Other common predisposing factors including poor quadricep, hamstring and soleus flexibility/length, poor quadriceps strength/plyometric control, poor pelvic control and abnormal dynamic foot posture/ biomechanics.
Treatment and management of OSD is centred around managing symptoms until the apophysis fuses. Generally, OSD has an excellent prognosis with full resolution of symptoms within 6 months of good quality conservative treatment when following the prescription of a thorough individualised impairment targeted rehabilitation program. Effective management includes but is not limited to patella tendon style compression taping or bracing, modification of the above modifiable predisposing factors and load management. It’s important to note that while frequency of exercises can reduce to 1-2x weekly post initial ‘rehabilitation phase’, to maintain current strength/plyometric adaptations it is important your child remains consistent with their exercises until full apophysis fusion has occurred to prevent re-lapse and re-flaring of symptoms. Alongside this during the phase of a growth spurt risk for re-flaring of symptoms does increase, if symptoms during this period are unable to be effectively managed with reducing workloads and increasing soft tissue releasing techniques, totally withdrawing the child from the provocative activity/sport until symptoms settle and the lag between tendon/muscle lengthening adaptation has taken place in regards to recent bone growth (lengthening) may be necessary.


