Definitions
1. Apophysis
  1. Secondary ossification sites for tendon insertions
2. Apophysitis
  1. Apophyseal inflammation prior to growth plate closure
Pathophysiology
1. Bone grows faster than muscle and tendon during growth spurt in adolescents
2. Results in a physiologic inflexibility at the apophyses
Epidemiology
1. Apophysitis is seen most commonly in young athletes
2. Pelvis is the most common site of Apophyseal Fracture
Causes: Sites of Apophyseal Injury: General
1. Elbow at medial epicondyle: Little Leaguer's Elbow
2. Knee: Osgood-Schlatter Disease
3. Heel: Sever's Disease
Causes: Sites of Apophyseal Injury: Pelvis
1. Anterior Superior Iliac Spine
  1. Sartorius tendon insertion
2. Anterior Iliac Spine
  1. Rectus Femoris tendon insertion
3. Ischial tuberosity
  1. Hamstring tendon insertion
4. Iliac Crest
  1. Transverse abdominis insertion
  2. External oblique insertion
  3. Internal oblique tendon insertion

Apophysitis (C0264110)
Concepts	Disease or Syndrome (T047)
ICD10	M93.9
SnomedCT	203422003, 29321007, 156822009, 268125000
English	Apophysitis, NOS, Apophysitis NOS, Apophysitis NOS (disorder), Apophysitis, Apophysitis (disorder), apophysitis, Apophysitis not specified as adult or juvenile, of unspecified site
Spanish	Apophysitis NOS, apofisitis (trastorno), apofisitis, SAI (trastorno), apofisitis, SAI, apofisitis
Sources	Derived from the NIH UMLS (Unified Medical Language System)

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