Lower-Crossed Syndrome (LCS) is also referred to as distal or pelvic crossed syndrome.According to Janda, there is a muscle imbalance in the lower segement of the body. Thus in Lower Crossed Syndrome there is:
TIGHTNESS: Thoracolumbar extensors on dorsal side and iliopsoas and rectus femoris,
WEAKNESS: Deep abdominals, gluteus maximus and gluteus medius
This pattern of imbalance creates joint dysfunction, particularly at the L4-L5 and L5-S1 segments, SI joint, and hip joint.
If the lordosis is deep and short, then imbalance is predominantly in the pelvic muscles.
if the lordosis is shallow and extends into the thoracic area, then imbalance predominates in the trunk muscles .
LOWER CROSSED SYNDROME TYPE-A vs TYPE-B
The two types are similar and involve the same main muscle imbalance characteristics.However
Type A: It extends into the thoracolumbar area, with a more cranial shift of the kyphosis, anterior pelvic tilt and genu recurvatum. It is typically due to shortness of hip flexors leading to a deeper and shorter lordosis .