Wilson A M, McGuigan M P, Fouracre L, MacMahon L
Veterinary Basic Sciences, The Royal Veterinary College, Hatfield, Hertfordshire, UK.
Equine Vet J. 2001 Mar;33(2):159-65. doi: 10.1111/j.2042-3306.2001.tb00594.x.
Mechanical overload due to poor conformation or shoeing has been suggested to contribute to the development of navicular disease. While studies have determined the compressive force exerted on the navicular bone in normal horses, this has not been reported for horses with navicular disease. Also, the force has not been converted to stress by correction for contact area. In this study we developed a technique for the determination of the contact area between the deep digital flexor tendon and the navicular bone in vivo, and used a forceplate system to determine the force and stress on the bone at trot in 6 normal and eight diseased horses. The mean +/- s.d. peak force and peak stress were 5.62+/-1.45 N/kg and 2.74+/-0.76 MPa for the normal group and 6.97+/-1.50 N/kg and 3.07+/-0.55 MPa for the navicular disease group. The peak force and peak stress were similar for both groups but the force and stress in the horses with navicular disease were approximately double control group values early in the stance phase. This was due to a higher force in the deep digital flexor tendon, which was attributed to a contraction of the deep digital flexor muscle in early stance in an attempt to unload the heels.
由于体型不良或蹄铁安装不当导致的机械性过载被认为会促使舟状骨疾病的发展。虽然已有研究确定了正常马匹施加在舟状骨上的压缩力，但对于患有舟状骨疾病的马匹，尚未有相关报道。此外，该力尚未通过接触面积校正而转换为应力。在本研究中，我们开发了一种在体内测定指深屈肌腱与舟状骨之间接触面积的技术，并使用测力板系统来确定6匹正常马和8匹患病马在小跑时施加在骨上的力和应力。正常组的平均±标准差峰值力和峰值应力分别为5.62±1.45 N/kg和2.74±0.76 MPa，舟状骨疾病组为6.97±1.50 N/kg和3.07±0.55 MPa。两组的峰值力和峰值应力相似，但在站立初期，患有舟状骨疾病的马匹的力和应力约为对照组值的两倍。这是由于指深屈肌腱中的力较高，这归因于指深屈肌在站立初期的收缩，试图减轻蹄踵的负荷。
