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Variations in the Bicipital Groove in North Indian Population: a Morphological and Morphometric Study and Review of Literature

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Variations in the Bicipital Groove in North Indian Population: a Morphological and Morphometric Study and Review of Literature International Journal of Health Sciences and Research www.ijhsr.org ISSN: 2249-9571 Original Research Article Variations in the Bicipital Groove in North Indian Population: A Morphological and Morphometric Study and Review of Literature Sangeeta Gupta1*, Berjina Farooq Naqshi2*, Adil Bashir Shah3, Nazia Hassan4*, Sunanda Raina5*, Hayat Ahmad Khan6, Neena Gupta4* 1Associate Professor, 2PG Scholar, 4Demonstrator, 5Professor and HOD; *Department of Anatomy, GMC Jammu. 3MS orthopaedics, Medical Officer, Department of Health, J & K Government. 6Senior Resident, Department of Orthopaedics, GMC Srinagar. Corresponding Author: Adil Bashir Shah Received: 10/08/2015 Revised: 23/08/2015 Accepted: 25/08/2015 ABSTRACT The morphology and morphometry of the bicipital grooves of the proximal end of humerus were studied in 100 intact dry humeri in the north Indian population. The parameters that were studied included the length, depth and width of the bicipital groove and the maximum length of the humeri. The incidence of supratrochlear ridge in the humeri were noted.The data was tabulated as mean ± SD and statistical comparison was made between the right and left side. No parameter was found to have a statistical significant difference between the two sides (p<.05). Supratrochlear ridge of humerus was found in 42% of the humeri. The present study is an attempt to determine the morphometry of the bicipital groove in the humeri of north Indian population. The data can be useful to anthropologists, orthopaedic surgeons and clinical anatomists. Keywords: Bicipital groove, intertubercular sulcus, supratrochlear ridge of Meyer, long head of biceps tendon, shoulder arthroplasty. INTRODUCTION humeral ligament is shaped like an abroad The intertubercular sulcus of the band passing between the tubercles and proximal humerus is situated between the converting the sulcus into a canal and act as greater and the lesser tuberosities but it a retinaculum for the long tendon of the continues distally for about 5 cm on the biceps brachii muscle for which it acts as a shaft as the bicipital groove. [‎1,‎2] retinaculum. [‎3] It contains the long head of the From a functional point of view, the biceps brachii muscle, its synovial sheath most important region of the bicipital groove and an ascending branch of the anterior is the intertubercular sulcus. The circumflex humeral artery. Its lateral lip is coracohumeral ligament directly overlies the marked by the bilaminar tendon of the transverse humeral ligament and is pectoralis major, its floor by the tendon of continuous with the rotator cuff. [‎4] the latissimus dorsi and its medial lip by the This groove with transverse humeral tendon of the teres major. The transverse ligament/ muscle fibers bridging it provides International Journal of Health Sciences & Research (www.ijhsr.org) 220 Vol.5; Issue: 9; September 2015 stability and smooth functioning of tendon deep narrow BG can cause LBT irritation of long head of biceps brachii muscle and and tenosynovitis, osseous spurs in the BG prevents its subluxation during can cause LBT fraying and the presence of multidirectional biomechanical movements the supratubercular ridge of Meyer is of arms. Apart from this, the greater suspected to promote dislocation. [‎7] function of biceps brachii muscle whose The data related to the bicipital tendon is enshrined in bicipital groove is groove in the Indian population is supination, flexion and screwing scarce.The knowledge of bicipital groove is biomechanical movements. On motion of highly useful in prosthetic sizing, humerus, the proximal humerus moves in positioning and designing. Bicipital groove relation to fixed biceps tendon which is also acts as an important landmark for firmly held in place at the level of placement of lateral fin of prosthesis in intertubercular sulcus by tuberosities and shoulder arthroplasty and humeral head humeral transverse ligament. [‎4] With replacement in fractures of upper end of elevation of the arm, the humerus moves humerus. [‎10] The bicipital groove shows a about 3.8cm on the fixed tendon. [‎6] In the wide degree of variation and the present motion from external rotation to internal study is undertaken to determine the rotation the tendon is forced medially morphology and morphometry of the against the lesser tuberosity and superiorly bicipital groove in the north Indian against the transverse humeral ligament. [‎7] population. Morphometry of BG may influence the functions of surrounding structures leading MATERIALS AND METHODS to various pathological conditions. [‎2,‎8] The study was carried out on 100 Supratubercular ridge originally human humeri. The age and sex of the described by Meyer in 1928 [‎7] and later by specimen was not determined. 53 among Hitchcock and Bechtol in 1948 [‎5] consists of them were from the right side and 47 from bony protuberance and is continuous with the left side. All the humeri were obtained superior aspect of lesser tuberosity. The from the Postgraduate Department of supratubercular ridge was defined by Cone Anatomy, GMC, Jammu. These bones were as‎“a‎bony‎ridge‎extending‎proximally‎from‎ unpaired. Humeri with gross evidence of the lesser tuberosity more than one half of disease were excluded from the study. The the distance to the humeral head”. [‎9] maximum length of the humerus was Bicipital groove and proximal tendon measured using an osteometric board. The disorders are becoming increasingly bicipital groove of each bone was recognized as an important symptom thoroughly examined and parameters generator in theshoulder. The spectrum of included length, width and depth .The length abnormalities includes tenosynovitis, pulley of the bicipital groove was measured as the lesions, SLAP tears, bicepsdislocations, and maximum vertical distance between the proximal tears. The bicipital groove (BG) greater and lesser tuberosity. The maximum and the long head of the biceps tendon width of the bicipital groove recorded at any (LBT) are intimately related; the shape of point was considered its width .Depth was the BG can have a great impact on the measured as the distance between the floor tendency for the LBT to be dislocated, and the margins of the bicipital groove at the subluxated, frayed, or torn. It is understood midpoint of the tubercles. A vernier caliper that a shallow, wide BG can promote was used for all the measurements. The data subluxation and/or dislocation of the LBT, a was recorded separately for right and left International Journal of Health Sciences & Research (www.ijhsr.org) 221 Vol.5; Issue: 9; September 2015 humeri. Statistical analysis between the humerus was 30.592±2.39cm.The mean sides was performed using independent t- length of the bicipital groove was test. p-values <0.05 were considered 2.97±0.34cm .The mean width was significant. The data was presented as mean 0.717±0.16cm and the mean depth was ±SD. The humeri were also analysed for the 0.423±0.1cm. Table 1 shows the data presence of ridge of Meyer. analysed between the sides .No parameter showed statistically significant difference RESULTS (p-value>0.05) between the right and left Morphometric measurements of the sides. A supratubercular ridge of Meyer was bicipital groove were carried out on 100 identified in 42 of the 100 humeri (42%).Of humeri .The mean maximum length of the these 30 were present on the right side. TABLE 1: Morphometric measurements of bicipital groove and maximum humeral length Parameter (cm) Right side Left side p value Length of the bicipital groove. 2.96±0.36 2.98±0.32 0.48 Width of the bicipital groove 0.74±0.166 0.68±0.16 0.54 Depth of the bicipital groove 0.43±0.11 0.41±0.08 0.07 Maximum length of the humeri 30.83±2.33 30.31±2.46 0.78 Values are as mean±SD, p<0.05 4 length of bicipital groove 3.5 3 2.5 2 1.5 1 0.5 0 0 20 40 60 80 100 120 Fig 1: Distribution of length of bicipital groove width of bicipital groove 1.4 1.2 1 0.8 0.6 0.4 0.2 0 0 20 40 60 80 100 120 Fig 2: Distribution of width of bicipital groove International Journal of Health Sciences & Research (www.ijhsr.org) 222 Vol.5; Issue: 9; September 2015 Depth of the bicipital groove 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 20 40 60 80 100 120 Fig 3: Distribution of depth of the bicipital groove Fig 4: Bicipital groove Fig 5: Supracondylar ridge of Meyer DISCUSSION of the biceps tendon (LHBT) travels through Rockwood and Matsen mentioned the glenohumeral joint space from its origin that humans are unique among primates in and turns anteriorly to enter the bicipital presenting marked variation in the groove at an angle of 350.The LHBT is intra configuration of the bicipital groove .The articular and intracapsular but extrasynovial. bicipital groove depth and width are The intertubercular groove provides the important factors in preventing subluxation bony constrain for the LHBT pulley system. and dislocation of tendons. A thick tendon in [‎10] a wide, shallow groove will have a tendency Primary bicipital tenosynovitis is a to dislocate. At the other extreme, a deep, condition limited to the tendon without narrow groove is likely to constrict the evidence of associated shoulder pathology. tendon and cause impingement syndrome. Individuals who participate in sports that [‎19,‎20] require repeated overhead motions are at Pathology in the long head of the risk. Narrowing of the bicipital groove, biceps tendon can be responsible for marked which can occur when the bony anatomy is shoulder pain and disability. The long head altered after fracture, glenohumeral joint International Journal of Health Sciences & Research (www.ijhsr.org) 223 Vol.5; Issue: 9; September 2015 arthritis and groove anomalies can all in the size of its long tendon.
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