Lindsay has had like a zillion nagging injuries for the past couple of years. Her clay seasons have been pathetic. And whenever her level of tennis was raising she had an injury. Let's have an overview:
2000: She started the year amazingly, winning the Australian Open, Indian Wells, reached the final of the Ericcson. The she had a back injury
which did not let her play the entire clay season except Roland Garros (where she played injured and lost in the first round). Had to withdraw from the Olympics with toe injury
(in her fifth methatarsal).
2001: She had to retire due to a knee injury
in the QF of the Nasdaq 100 open against Dementiva. She won eastbourne, her first comeback tournament, and ended the year winning three titles in a row. Then reached the semis of the WTA Championship where she beat Clijsters to get the #1 ranking, BUT injured her knee
therefore could not play the final and the title went to Serena.
2002: After nine months out and a knee surgery, she came back and reached the semis of the Open and was bothered in her future tournaments by a tight left thigh
2003: Had to retire from Roland Garros with a toe nerve
injury, which also affected in the LA final and had to withdraw from Pilot Pen final.
Pheww.... that was long
I know Venus has had a hard time, so as Monica. Don't really know if Serena has had a big injury (except for the knee).