Baudisch Natalie, Singer Ellen, Jensen Katharina Charlotte, Eichler Fabienne, Meyer Henning Jürgen, Lischer Christoph, Ehrle Anna
Equine Clinic, School of Veterinary Medicine, Veterinary Hospital Freie Universität Berlin, Berlin, Germany.
Sussex Equine Hospital, Ashington, West Sussex, UK.
Equine Vet J. 2025 Mar;57(2):492-501. doi: 10.1111/evj.14123. Epub 2024 Jun 27.
Surgical treatment options for horses with overriding dorsal spinous processes include interspinous ligament desmotomy and partial spinous process ostectomy. The impact of spinal surgery on the three-dimensional biomechanics of the equine thoracolumbar spine and the epaxial musculature is unclear.
To investigate the influence of interspinous ligament desmotomy and cranial wedge ostectomy on the biomechanics of the equine thoracolumbar spine and the paraspinal Musculi multifidi.
Ex-vivo experiments.
Twelve equine thoracolumbar spine specimens were mounted in a custom-made mechanical test rig. Based on computed tomographic imaging, distances between dorsal spinous processes and the spinal range of motion (lateral bending, axial rotation, flexion, extension) were compared before and after desmotomy and cranial wedge ostectomy performed at two or five surgical sites. Anatomical dissection was subsequently conducted to document surgical trauma to the Musculi multifidi following desmotomy.
The distance between spinous processes in neutral position did not increase significantly after desmotomy (median preoperative = 7.2 mm, interquartile range [IQR] = 3.6 mm; median postoperative = 7.4 mm, IQR = 3.7 mm; p = 0.09), but increased significantly after ostectomy (median preoperative = 8.8 mm, IQR = 4.2 mm; median postoperative = 13 mm, IQR = 6.1 mm; p < 0.001). Both surgical procedures significantly increased the rotational spinal range of motion (p = 0.001), particularly at the level T14/T15 (median preoperative = 6.4°, IQR = 3.2°; median postoperative = 8.2°, IQR = 3.5°; increase = 28.1%; p = 0.02). Musculi multifidi injury was evident at all desmotomy sites.
Ex-vivo study with limited sample size.
Neither interspinous ligament desmotomy nor cranial wedge ostectomy resulted in an increased range of motion during flexion, extension or lateral bending but both procedures influenced the rotational component of the equine thoracolumbar spinal mobility.
对于背侧棘突重叠的马匹，手术治疗选择包括棘间韧带切断术和部分棘突切除术。脊柱手术对马胸腰椎三维生物力学和轴上肌肉组织的影响尚不清楚。
研究棘间韧带切断术和颅骨楔形切除术对马胸腰椎生物力学和椎旁多裂肌的影响。
体外实验。
将12个马胸腰椎标本安装在定制的机械试验台上。基于计算机断层扫描成像，比较在两个或五个手术部位进行韧带切断术和颅骨楔形切除术前、后棘突间距离和脊柱活动范围（侧弯、轴向旋转、前屈、后伸）。随后进行解剖以记录韧带切断术后多裂肌的手术创伤。
韧带切断术后中立位棘突间距离未显著增加（术前中位数=7.2mm，四分位间距[IQR]=3.6mm；术后中位数=7.4mm，IQR=3.7mm；p=0.09），但切除术后显著增加（术前中位数=8.8mm，IQR=4.2mm；术后中位数=13mm，IQR=6.1mm；p<0.001）。两种手术均显著增加了脊柱旋转活动范围（p=0.001），尤其是在T14/T15水平（术前中位数=6.4°，IQR=3.2°；术后中位数=8.2°，IQR=3.5°；增加=28.1%；p=0.02）。所有韧带切断术部位均可见多裂肌损伤。
样本量有限的体外研究。
棘间韧带切断术和颅骨楔形切除术均未导致前屈、后伸或侧弯时活动范围增加，但两种手术均影响了马胸腰椎活动度的旋转部分。
