Position and types of lumbar pseudospondylolisthesis: X-ray analysis

Objective:To establish the types of lumbar pseudospondylolisthesis (LP) in X ray diagnosis. Methods:From June 1992 to May 2000, 5 650 patients who were examined by X ray on their vertebrae were analyzed retrospectively. All the patients were examined by X ray with anteroposterior and lateral film, some patients were examined by X ray with special positions. Results:Four hundred and eighty five patients with LP (8.58%) were found in the group, including 121 males and 364 females. Most of LP occurred at the lower part of lumbar vertebrae, especially in the forth lumbar vertebrae. Conclusion:Most of LP occur at the lower part of lumbar vertebrae. According to the direction of the lumbar spondylolisthesis, LP can be divided into 4 types.