The assessment of intersegmental motion and pelvic tilt in elite oarsmen.
Low back pain (LBP) is a common problem in elite oarsmen. The relevance of spinal and pelvic flexibility to good rowing technique and the incidence of LBP is unclear.


OBJECTIVE
The aim of this study was to investigate patterns of spinal and pelvic mobility in a group of elite oarsmen with and without a history of LBP.


METHODS
Twenty elite oarsmen were recruited into this study, including nine with no history of spinal problems, four with a current spinal problem, and the remainder with a history of LBP. Subjects were scanned using an interventional magnetic resonance imaging (MRI) scanner. Four key stages of the rowing stroke were simulated within the scanner, and sagittal images of the lumbar spine and sacrum were obtained. From these images intersegmental motion was determined along with the angle of lordosis and position of the lumbar spine and sacrum.


RESULTS
Different mobility trends were seen; oarsmen with no history of LBP demonstrated the greatest mobility in their lower lumbar regions (at the L5/S1 level in the catch position 7.5 degrees +/-1.3 in normals; 4.8 degrees +/-1.2 in previous LBP groups; and 2.8 degrees +/-5.5 in current LBP group) and the lowest rotation of their pelvis (level in the catch position 13.9 degrees +/-11.2 in normals; 16.1 degrees +/-6.8 in previous back pain groups; and 15.2 degrees +/-11.2 in current back pain group). In contrast, those with either current or previous LBP presented with a hypomobility of their spine which appeared to be compensated for by increased pelvic rotation.


CONCLUSIONS
Marked differences were observed in the motion characteristics of these 3 groups of oarsmen. At present it is not known if these changes are causative or effect.
BioDynamics Group, Department of Musculoskeletal Surgery, Imperial College of Science, Technology & Medicine, London, United Kingdom. a.mcgregor@ic.ac.uk
Alison
A
McGregor
Lisa
L
Anderton
Wady
W
Gedroyc
D000328:Adult; D001696:Biomechanical Phenomena; D006615:Hip / Q000502:physiology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008159:Lumbar Vertebrae / Q000502:physiology*; D008279:Magnetic Resonance Imaging; D008297:Male; D009068:Movement / Q000502:physiology*; D012447:Sacrum / Q000502:physiology; D013177:Sports / Q000502:physiology*