+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 4. Morphometric, microscopic and biomechanical properties of the digital tendons of the forelimb



Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 4. Morphometric, microscopic and biomechanical properties of the digital tendons of the forelimb



New Zealand Veterinary Journal 52(5): 285-292



To determine the weight, volume, density and cross-sectional area (CSA) of the digital flexor tendons, common digital extensor tendon (CDET) and suspensory ligament (SL) of the forelimb of young Thoroughbred horses in early training, and to assess the response to a training programme of known parameters of superficial digital flexor tendon (SDFT) tissue at mid-metacarpal level. The tendons of seven 2-year-old Thoroughbred horses in training were inspected, transected into segments of known length, and compared with those from seven untrained horses matched for age, sex and breed. The weight, volume, density and CSA of each segment, and the crimp angle, histological features, and biomechanical ultimate stress and stiffness of tendon samples from the mid-metacarpal region of the SDFT were determined. There was no macroscopic evidence of swelling or discolouration in any of the tendon segments or cut surfaces. The volumes of SDFT and CDET segments of horses in the trained group were significantly greater than those in the untrained group (p=0.036 and p=0.039, respectively). A greater increase in volume than weight resulted in a lower density in the SDFT but not CDET in trained compared with untrained horses (p=0.038). CSA of these two tendons was significantly greater in the trained group (p=0.002 and 0.036, respectively), the percentage increase being greater in the CDET than the SDFT. The number of tenocytes at four sites in the mid-metacarpal SDFT region was less in trained than untrained horses (p=0.025). There was no histological evidence of inflammation, and no difference in crimp angle between groups. There was no significant between-group difference in stiffness or ultimate stress of tendon strips. Volume and CSA of the SDFT and CDET were larger in trained than untrained horses. The SDFT was less dense in the trained group. Because no evidence of tendonitis was detected and training appeared to have no significant effect on crimp angle or biomechanical properties of tendon strips, the size and density changes were presumed to be adaptive and induced by the training. Although evident in this in vitro study, the detection of adaptive from initial pathological increase in size of the SDFT is likely to be difficult in vivo.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 004243865

Download citation: RISBibTeXText

PMID: 15768125

DOI: 10.1080/00480169.2004.36441


Related references

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 3. In vivo ultrasonographic assessment of the cross-sectional area and echogenicity of the superficial digital flexor tendon. New Zealand Veterinary Journal 52(5): 280-284, 2004

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. Conclusions. New Zealand Veterinary Journal 53(6): 377-383, 2005

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 5. Kinematic effects. New Zealand Veterinary Journal 53(2): 95, 2005

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 2. Measurement error and effect of training stage on the relationship between objective and subjective criteria of training workload. New Zealand Veterinary Journal 52(5): 272-279, 2004

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 6. Bone parameters in the third metacarpal and third metatarsal bones. New Zealand Veterinary Journal 53(2): 101-112, 2005

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 7. Bone and articular cartilage response in the carpus. New Zealand Veterinary Journal 53(2): 113-122, 2005

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 1. Study design, and clinical, nutritional, radiological and histological observations. New Zealand Veterinary Journal 52(5): 261-271, 2004

Correlation between clinical and ultrasound evaluation of forelimb digital flexor tendons' lesions in thoroughbred horses in Venezuela. Revista Cientifica, Facultad de Ciencias Veterinarias, Universidad del Zulia 14(6): 506-512, 2004

Musculoskeletal responses of 2-year-old Thoroughbred horses to early training. 8. Quantitative back-scattered electron scanning electron microscopy and confocal fluorescence microscopy of the epiphysis of the third metacarpal bone. New Zealand Veterinary Journal 53(2): 123-132, 2005

The effect of recombinant equine growth hormone on the biomechanical properties of healing superficial digital flexor tendons in horses. Veterinary Surgery 31(4): 320-324, 2002

Biomechanical properties of tissue-engineered tendons after repairing digital flexor tendons in chickens. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 20(4): 601-604, 2003

Serum biomarker levels for musculoskeletal disease in two- and three-year-old racing Thoroughbred horses: A prospective study of 130 horses. Equine Veterinary Journal 42(7): 643-651, 2010

In-vivo study on forelimb superficial and deep digital flexor muscle isometric force characteristics in thoroughbred horses. Veterinary Surgery 29(5): 484, September-October, 2000

An age-related study of morphology and cross-link composition of collagen fibrils in the digital flexor tendons of young thoroughbred horses. Connective Tissue Research 36(3): 253-260, 1997

Epidemiology studies of musculoskeletal racing and training injuries in Thoroughbred horses, Minnesota, USA. Acta Veterinaria Scandinavica (Suppl. 84): 340-343, 1988