Femur
Multiplanar deformity
- worsend by previous surgery
- may require osteotomy
Acetabulum
Dysplasia often present
- not as severe as in DDH
LLD
Can be significant
Abductors
Have been short for long time
- difficult to restore length
Traumatic initial cause in 95%
M:F 2:1
Age of initial dislocation inversely related to recurrence rate
- patients younger than 20 have a redislocation rate of 90%
- between 20 - 40 years, redislocation rate of 60%
- patients > 40 years have a 10% rate of dislocation but a higher rate of cuff tears (up to 40% in patients > 60yrs)
Idiopathic condition of the immature femoral capital epiphysis involving varying degrees of osteonecrosis
AKA
- Legg-Calve-Perthes disease
- coxa plana
Described in separate publications in 1912 by
- Legg (Boston)
- Calve (France)
- Perthes (Germany)
M: F 4:1
1 in 740 males