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Passive hip range of motion in adult Greyhounds
In racing greyhounds, the ranges of normal pelvic limb range of motion are very important. Which factors influence hip range of motion in a population bred to meet the specific demands of racing? A very interesting cross-sectional study.

Thirty-two dogs (17 male and 15 female) 13 to 81 months old were randomly selected from a local pool of 160 Greyhounds.

Goniometric measurements of hip, stifle and hock range of motion were recorded in triplicate. Signalment information collected included sex, weight and age of each Greyhound.

The outcome factors for the study were range of hip flexion and hip extension. The theorised exposures, age, sex, weight, racing history and hock and stifle range of motion, were modelled against the outcome variables by linear regression analysis.

Results: Male dogs were significantly heavier (P < 0.001) and older (P < 0.002) than female dogs. Mean hip flexion was 71.75° and mean hip extension 128.10°.

The determinants of hip flexion were sex (P = 0.008) and range of stifle flexion (P = 0.002). Race training did not influence the range of hip flexion in the sample.

Determinants of hip extension included range of stifle extension (P = 0.015), history of race training (P = 0.004) and hock flexion.

The mean hip extension of raced Greyhounds was 134.95° compared with 121.25° for unraced Greyhounds (mean difference −13.70, 95% confidence interval −18.12, −9.29; P < 0.001).

Conclusions: This study has reported isolated pelvic limb joint range of motion in the racing Greyhound.

Hip range of motion was affected by stifle range of motion, sex and race training. Dogs that had received race training had greater flexibility, possibly due to training having an active stretching role on muscles, tendons and other structures limiting the hip range of motion.


Source: HL Nicholson, PG Osmotherly, BA Smith, CM McGowan (2007): Determinants of passive hip range of motion in adult Greyhounds. In: Australian Veterinary Journal 85 (6), 217–221.



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