Hello and welcome to HCM,
The symptoms that you have mentioned - easy dislocation of knee joint, easy bruising of the skin, easy injury on slight trauma all suggest a defect of connective tissue
.Ehler Danlos syndrome
is caused by abnormalities of collagen
The diagnosis can be confirmed by tissue biopsy
If the disease is proved on biopsy, genetic study needs to be done.
Ehler Danlos syndrome is a heterogeneous disease caused by multiple mutations.
Genetic study will determine the mutation and hence the sub type of Ehler Danlos syndrome.
Consult a dematologist preferably for further work up.
Thanks and take care
Dr Shailja P Wahal