Summary: Lumbar transitional vertebrae (LTV) is a congenital disorder described by the presence of an abnormal vertebrae between the last normal lumbar vertebrae and the first normal sacral vertebrae (i.e. “transitional vertebrae”). The severity of this kind of abnormality can be variable, and may cause effects anywhere from asymptomatic or weakness in the hind end, to incontinence or loss of coordination. LTV is one of the several spine conditions that can occur congenitally.

Screening: While the OFA Spine screening is still a pilot study, it can provide valuable insight into identifying and grading LTV, if present, as well as collecting valuable insight into the prevalence of this disorder within the breed’s gene pool. Currently, OFA notes their spine database and screening is of most importance to French Bulldogs, Bulldogs, and Boston Terriers.

Inheritance: Unknown. May be a result of environmental and/or genetic factors during fetal development.

Although Spine evaluations are not commonly practiced by Border Collie Breeders, OFA keeps a database to continue research into spine abnormalities. Spine evaluations are not currently required by BCSA.