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Ossified Sacrotuberous Ligament and Its Clinical Significance: a Case Report

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Ossified Sacrotuberous Ligament and Its Clinical Significance: a Case Report http:// ijp.mums.ac.ir Case Report (Pages: 6981-6985) Ossified Sacrotuberous Ligament and its Clinical Significance: A Case Report *Maria Francis Yuvaraj1, Anna Durai Priyadarshini1, Sanjana Rajkumar 2, PonuswamyKasiragan Sankaran3, Raghunath Gunapriya4, Munusamy Kumaresan1, Zareena Begum11 1Instructor, PhD Candidate, Saveetha Medical College and Hospital, Kuthambakkam, India. 2Saveetha College of Physiotherapy, Kuthambakkam, India. 3Associate Professor Saveetha Medical College and Hospital, Kuthambakkam, India. 4Professor Saveetha Medical College and Hospital, Kuthambakkam, India. Abstract The present study describes the morphometry of a unilateral ossified sacrotuberous ligament. It aims to discuss its anatomical and clinical implications.The pudendal nerve, internal pudendal artery, nerve to obturator internus and coccygeal branch of inferior gluteal artery, are the important structures related to sacrotuberous ligament. An ossified sacrotuberous ligament may be an important etiological factor in neurovascular compression syndromes and its anatomical knowledge may help in the development of new treatment strategy for this common clinical problem. The ossified sacrotuberous ligament in the present case exhibits, a characteristic anterior and posterior segment, a base at the ischial tuberosity and an apex attached to alae of sacrum. The ossified sacrotuberous ligament may be important in differential diagnosis of soft tissue pain and tenderness after trauma. It may be a challenging puzzle for the present day surgeon and radiologist in interpretation of radiological problems. Key Words: Ischial tuberosity, Neurovascular compression, Sacrotuberous ligament, Surgeon. *Please cite this article as: Yuvaraj MF, Priyadarshini AD, Rajkumar S, Sankaran PK, Gunapriya R, Kumaresan M, Begum Z. Ossified Sacrotuberous Ligament and its Clinical Significance: A Case Report. Int J Pediatr 2018; 6(1): 6981-85. DOI: 10.22038/ijp.2017.26545.2283 *Corresponding Author: Maria Francis Yuvaraj, Saveetha Medical College and Hospital, Kuthambakkam, India Email: [email protected] Received date: Nov.14, 2017; Accepted date: Dec.22, 2017 Int J Pediatr, Vol.6, N.1, Serial No.49, Jan.2018 6981 Ossified Sacrotuberous Ligament 1- INTRODUCTION consists of many collagen fibres giving Ligaments are tough, flexible and pliant support and strength to the sacrum and fibrous bands which connect the bones. maintains movements under the Hence the sacroiliac ligament forms an transmission of body weight from trunk to integral part of the sacroiliac joint. The lower extremities. The lower border of sacrotuberous ligament (posterior ligament was found to be directly sacrosciatic ligament) is located in lower continous with the tendon of long head of or posterior part of pelvis. It is flat and biceps femoris. Biceps femoris could triangular in form, narrower in the middle therefore act to stabilise the sacroiliac joint than at the ends. It morphologically via sacrotuberous ligament. The bottom of represents the degenerated part of Biceps the sacrotuberous ligament connects to the Femoris muscle. The pudendal nerve, thoracolumbar fascia that further connects internal pudendal artery, nerve to obturator into multifidus and erector spinae. It plays internus and coccygeal branch of inferior a very important role in walking and gluteal artery are the crucial structures running (4). around the sacrotuberous ligament. The An ossified sacrotuberous ligament may be sacrotuberous ligament passes from ischial a significant factor in differential diagnosis tuberosity to the ilium, sacrum and coccyx of soft tissue pain and tenderness after transforming the sciatic notch into a large trauma (5); in an ossified sacrotuberous sciatic foramen, which is further ligament, the pudendal nerve may get subdivided by the sacrospinous ligament. entrapped between the sacrotuberous and It is slender fan shaped ligament of the sacrospinous ligament, which is the posterior pelvis located on the either side intraligamentous space of these ligaments, of the body. Sacrotuberous ligament is an causing chronic perineal pain. The important part connecting the pelvic bone sacrotuberous ligament is surgically to the vertebral column; it maintains the removed to relieve the pain and it is an essential factor in undiagnosed chronic stability of the joint and transmits weight (1). The sacrotuberous ligament extends perineal pain (6). The knowledge from the lower part of sacrum and upper regarding the ossified sacrotuberous coccyx to the base or lower margin and ligament may be helpful for clinicians who medial part of ischial tuberosity. The undergo orthopaedic surgery to deal with sacrotuberous ligament is well developed neurovascular compression syndrome (7). at ischial tuberosity. By 28th week of fetal 2- CASE REPORT life the ligament seems to connect between the gluteus maximus and the tuberosity. At During a routine osteological study the 38th week, the intramuscular tendon of undergraduate medical studentsin the coccygeus muscle gets connected with the Department of Anatomy of Saveetha growing sacrotuberous ligament (2). Medical College, Kuthambakkam, India, observed an unusual variation of ossified In contrast, the sacrospinous ligament is sacrotuberous ligament in an articulated much weaker than the sacrotuberous pevis on the right side however the other ligament, although both are considered side was normal. After our observations, critical for stabilising the sacroiliac joint. we measured the thickness and length of The sacrotuberous ligament is an extrinsic the ossified sacrotuberous ligament by type of ligament. The association of long using digital vernier caliper. Photographs head of biceps femoris and sacrotuberous were taken and their values were tabulated ligament is well established but it is only (Table.1). partial (3). Sacrotuberous ligament Int J Pediatr, Vol.6, N.1, Serial No.49, Jan.2018 6982 Yuvaraj et al. Table-1: The measumerents of ossified sacrotuberous ligament. Ligament Length of Ligament Thickness of Ligament Proximal 15mm Ossified Sacrotuberous Ligament 10.2cm Middle 10mm Distal 12mm 3- DISCUSSION of coccygeal plexus pierces the The sacrotuberous ligament is sacrotuberous ligament and supplies the intimately associated with a variety of Gluteus Maximus (9). The close relationship with the blood vessels and ligaments and muscles. Each of these structures may interact with the ligament nerves suggest that this ligament may not differently and affect its functions. The be subjected to high loads, as heavily sacrotuberous ligament is clearly a loaded structures are not commonly significant component in joining the associated with the passage of myofascial trains of the lower extremities neurovascular bundles. Ossification of to the upper body (8). The sacrotuberous sacrotuberous ligament is described as a ligament is considered to be the slate pencil like formation, which begins at phylogenetically degenerated tendon of ischial tuberosity, projects into obturator origin of long head of Biceps femoris. The foramen and has a caudocranial growth fibres of sacrotuberous ligament passes (10). Occurrence of bilateral ossification of obliquely downwards forward laterally, sacrotuberous ligament is rare. and become narrow, as it reaches the Ossification is mostly seen in men and ischial tuberosity Figure.1. never seen in children, hence proving that it is an acquired lesion and not an It prolongs along inner margin of ischial epigenetic variation (11). ramus as a sickle shaped extension called falciform process, it also prevents the The apex of ossified sacrotuberous posterior rotation of ilium and sacrum. ligament was very irregular and showed During childbirth, the ligament becomes many bony protuberances. Ossification of flexible, making a way for the sacrum to sacrotuberous ligament may lead to the shift outwards, and also makes a path for compression of the vessels and the fetus. In standing, the body weight subsequently result in ischemia of the area transmitted on to the sacrum may cause supplied by it. It is also involved in coccyx anterior tilt of the sacrum. This is pain as it connects to the coccyx. There are prevented by the stretch in the posterior three possible sites where the pudendal sacroiliac joint along with the nerve may get entrapped between sacrotuberous ligament which acts an sacrotuberous ligament and sacrospinous automatic locking device or home screw ligament, in the pudendal canal and by the mechanism (8). The sacrotuberous falciform process of sacrotuberous ligament is very important for the ligaments (12). During the spinous maintainence of pelvic or sacral ligament fixation procedures, ignorance of balance.The ligament gives attachment to an ossified sacrotuberous ligament may the lowest fibres of Gluteus Maximus. pose unnecessary hindrance. The Coccygeal branches of Inferior Gluteal sacrotuberous ligament is partially fused artery and perforating cutaneous branches and adherent with the sacrospinous ligament. The pudendal nerve is Int J Pediatr, Vol.6, N.1, Serial No.49, Jan.2018 6983 Ossified Sacrotuberous Ligament theprinciple sensory nerve of external movement, disturbance of normal genetalia and perineum. Compression of urination, altered sensation during pudendal nerve leads to fecal incontinence, ejaculation and urinary or bowel numbness in the genitals, rectal pain, incontinence (10). reduced awareness of an impending bowel Fig.1: The picture shows ossified sacrotuberous ligament. 1. Arora J1, Mehta V, Suri RK, Rath G. 4- CONCLUSION Unilateral
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