HUMERAL TRIAL ASSEMBLY

Abstract

TITLE OF INVENTION: HUMERAL TRIAL ASSEMBLY A humeral trial assembly (100) includes a trial tray (110) and a post (120) slidably coupled to the trial tray (110). The trial tray (110) includes a first slot (111) located on a bottom face (110d) of the trial tray (110) and a plurality of grooves (112a, 112b, 112c) extending longitudinally for at least a partial width of the bottom face (110d) and intersecting the first slot (111). Each of the grooves (112a, 112b, 112c) corresponds to an offset position of a plurality of offset positions. The post (120) includes a first protrusion (121) provided on a proximal face (120a1) and a pair of second protrusions (122) disposed on either side of the first protrusion (121). The first protrusion (121) fits in and is slidable along the first slot (111). The pair of second protrusion (122) configured to engage with the grooves (112a, 112b, 112c). In an assembled state, the first protrusion (121) is disposed within the first slot (111) and the pair of second protrusions (122) mate with one of the grooves (112a, 112b, 112c) to achieve a corresponding offset position. Fig. 4

Specification

Description:FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(Section 10 and Rule 13)

1. TITLE OF THE INVENTION:
HUMERAL TRIAL ASSEMBLY
2. APPLICANT:
Meril Corporation (I) Private Limited, an Indian company of the address Survey No. 135/139, Muktanand Marg, Bilakhia House, Pardi, Vapi, Valsad-396191 Gujarat, India.




The following specification particularly describes the invention and the manner in which it is to be performed:

 
FIELD OF INVENTION
[1] The present disclosure relates to an orthopedic assembly. More particularly, the present disclosure relates to a humeral trial assembly.
BACKGROUND OF INVENTION
[2] Shoulder replacement surgeries or shoulder arthroplasty procedures are widely performed to relieve pain and restore normal functionality in patients suffering from severe shoulder joint conditions such as osteoarthritis, rheumatoid arthritis, or rotator cuff tear arthropathy. The procedure involves replacing the damaged or worn-out surfaces of the shoulder joint with artificial components, typically including a humeral component and a glenoid component.
[3] The humeral component typically consists of a stem, a humeral tray and a liner. The stem and the humeral tray interface with the prepared bone surface. To ensure accurate positioning and fit of a final implant, a trial version of the humeral tray is used during a surgery. This trial component allows the surgeon to assess the fit, alignment, and/or stability before selecting and implanting the final implant.
[4] In a conventional humeral trial system, multiple trays are provided for various offsets. Each conventional trial tray has a post integrally coupled with the trial tray at a given offset. During a trial phase of a shoulder replacement surgery, a surgeon performs a trial using different trays. For example, the surgeon implants one conventional trial tray having a given offset at a target location in a patient's body and assesses alignment, fit, range of motion, etc. with that trial tray. Then the surgeon removes this trial tray and implants another conventional trial tray with a different offset and performs the assessment. This process may be repeated several times to select an optimal offset as per the patient's anatomy to optimize the range of motion, muscle movement of arms, soft tissue tension and so on.
[5] Using separate trays to trial for different offset as is done conventionally, has several drawbacks. For example, switching between multiple trays during a surgical procedure increases complexity of the procedure and prolongs the time required for the surgery. Additionally, the storage and sterilization of multiple trays add to logistical challenges and costs.
[6] Hence, there arises a need of a humeral trial assembly which overcomes the problems related to conventionally available trial assemblies.
SUMMARY OF INVENTION
[7] Particular embodiments of the present disclosure are described herein below with reference to the accompanying drawings; however, it is to be understood that the disclosed embodiments are mere examples of the disclosure, which may be embodied in various forms. Well-known functions or constructions are not described in detail to avoid obscuring the present disclosure in unnecessary detail. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present disclosure in virtually any appropriately detailed structure.
[8] The present disclosure relates to a humeral trial assembly. In an embodiment, the humeral trial assembly includes a trial tray and a post slidably coupled to the trial tray. The trial tray includes a first slot located on a bottom face of the trial tray and a plurality of grooves provided on the bottom face extending longitudinally for at least a partial width of the bottom face. The first slot extends from a periphery of the bottom face towards a center of the trial tray. The plurality of grooves intersects the first slot at a pre-defined angle. Each groove of the plurality of grooves corresponds to an offset position of a plurality of offset positions. The post includes a first protrusion provided on a proximal face of the post and a pair of second protrusions provided on the proximal face of the post and disposed on either side of the first protrusion. The first protrusion is configured to fit in the first slot of the trial tray and is slidable along the first slot. The pair of second protrusion engages with the plurality of grooves. In an assembled state, the first protrusion is disposed within the first slot, and the pair of second protrusion mate with one of the plurality of grooves, thereby achieving a corresponding offset position.
BRIEF DESCRIPTION OF DRAWINGS
[9] The summary above, as well as the following detailed description of illustrative embodiments, is better understood when read in conjunction with the apportioned drawings. For the purpose of illustrating the present disclosure, exemplary constructions of the disclosure are shown in the drawings. However, the disclosure is not limited to specific methods and instrumentality disclosed herein. Moreover, those in the art will understand that the drawings are not to scale.
[10] Fig. 1 depicts an assembled view of a humeral trial assembly 100, according to an embodiment of the present disclosure.
[11] Fig. 2A depicts a front view of a trial tray 110, according to an embodiment of the present disclosure.
[12] Fig. 2B depicts a bottom perspective view of the trial tray 110, according to an embodiment of the present disclosure.
[13] Fig. 2C depicts a top perspective view of the trial tray 110, according to an embodiment of the present disclosure.
[14] Fig. 3A depicts a perspective view of a post 120, according to an embodiment of the present disclosure.
[15] Fig. 3B depicts a front view of the post 120, according to an embodiment of the present disclosure.
[16] Fig. 4 depicts a perspective view of the humeral trial assembly 100, according to an embodiment of the present disclosure.
[17] Fig. 5 depicts a front view of the humeral trial assembly 100, according to an embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[18] Prior to describing the invention in detail, definitions of certain words or phrases used throughout this patent document will be defined: the terms "include" and "comprise", as well as derivatives thereof, mean inclusion without limitation; the term "or" is inclusive, meaning and/or; the phrases "coupled with" and "associated therewith", as well as derivatives thereof, may mean to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have a property of, or the like. Definitions of certain words and phrases are provided throughout this patent document, and those of ordinary skill in the art will understand that such definitions apply in many, if not most, instances to prior as well as future uses of such defined words and phrases.
[19] Reference throughout this specification to "one embodiment," "an embodiment," or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, appearances of the phrases "in one embodiment," "in an embodiment," and similar language throughout this specification may, but do not necessarily, all refer to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "including," "comprising," "having," and variations thereof mean "including but not limited to" unless expressly specified otherwise. An enumerated listing of items does not imply that any or all of the items are mutually exclusive and/or mutually inclusive, unless expressly specified otherwise. The terms "a," "an," and "the" also refer to "one or more" unless expressly specified otherwise.
[20] Although the operations of exemplary embodiments of the disclosed method may be described in a particular, sequential order for convenient presentation, it should be understood that the disclosed embodiments can encompass an order of operations other than the particular, sequential order disclosed. For example, operations described sequentially may in some cases be rearranged or performed concurrently. Further, descriptions and disclosures provided in association with one particular embodiment are not limited to that embodiment, and may be applied to any embodiment disclosed herein. Moreover, for the sake of simplicity, the attached figures may not show the various ways in which the disclosed system, method, and apparatus can be used in combination with other systems, methods, and apparatuses.
[21] Furthermore, the described features, advantages, and characteristics of the embodiments may be combined in any suitable manner. One skilled in the relevant art will recognize that the embodiments may be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments. These features and advantages of the embodiments will become more fully apparent from the following description and apportioned claims, or may be learned by the practice of embodiments as set forth hereinafter.
[22] The present disclosure relates to a humeral trial assembly. In an embodiment, the humeral trial assembly includes a trial tray and a post adjustably coupled with the tray. The humeral trial assembly is designed for use in shoulder replacement surgeries. During a shoulder replacement procedure (such as a total shoulder arthroplasty or a reverse shoulder arthroplasty) an optimal offset needs to be determined to achieve the best possible alignment, fit, and function of the shoulder implant according to the needs and anatomy of a patient. In the context of the present disclosure, an offset refers to a distance between a central axis of the trial tray and a central axis of the post. A final implant is then selected based upon the optimal offset. Thus, selecting the optimal offset during a trial phase of the shoulder replacement procedure plays an important role to restore natural biomechanics of the humeral joint, ensure proper load distribution, and achieve balance limb length with the help of the final implant. According to the teachings of the present disclosure, the post of the humeral trial tray assembly is adjustable to a plurality of offset positions with respect to the trial tray. During a trial phase of the shoulder replacement surgery, the position of the post can be adjusted between different offset positions depending desired offsets to be trialed. Thus, the humeral trial assembly of the present disclosure is capable of realizing multiple offsets using a single trial tray and eliminates the use of multiple trial trays as seen with conventional systems. Further, the trial tray and the post are designed in such a way that the position of the post can be easily adjusted and the post is locked in place within the trial tray, thereby providing a streamlined and accurate method for selecting the appropriate offset during a surgery. The humeral trial assembly of the present disclosure eliminates need for multiple trial trays and increases the precision of shoulder replacement procedures. By incorporating multiple offset options into a single tray, the invention simplifies the surgical process and reduces the risk of errors associated with manual tray selection. Thus, the proposed humeral trial assembly reduces the complexity of the procedure and is also less time consuming, thereby improving the overall patient outcome. The proposed humeral trial assembly is also costs effective since multiple trial trays are not needed.
[23] Fig. 1 depicts a humeral trial assembly 100 (or assembly 100), according to an embodiment. The humeral trial assembly 100 has a proximal end 100a and a distal end 100b. The humeral trial assembly 100 includes a trial tray 110 and a post 120. The post 120 is slidably coupled to the trial tray 110. During medical procedures, such as, shoulder replacement surgeries or shoulder arthroplasty procedures, the humeral trial assembly 100 of the present disclosure enables a surgeon to realize multiple offsets for assessing a fit of an implant, determining a range of motion between various components of the implant so as to identify an optimal offset for a patient. The surgeon may realize different offset positions by adjusting a position of the post 120 with respect to the trial tray 110 accordingly. Thus, the humeral trial assembly 100 allows a surgeon to determine precise and optimal placement and alignment of prosthetic components before finalizing a permanent implant so as to achieve a best possible outcome for the patient.
[24] Fig. 2A-2C depicts various views of the trial tray 110, according to an embodiment of the present disclosure. The trial tray 110 is designed to accommodate the post 120. The trial tray 110 has a proximal end 110a and a distal end 110b. The trial tray 110 generally has a circular shape, although the trial tray 110 may any other shapes, such as, without limitation, oval, trapezoidal, circular, rectangular, sphere, etc. The trial tray 110 may be made of a material, such as, without limitation, Polyphenylsulfone (PPSU), Polypropylene, ultra-high molecular weight polyethylene (UHMWP), Polyoxymethylene Copolymer (POM-C) or any other biocompatible medical grade poly material. In an embodiment, the trial tray 110 is made of UHMWP.
[25] The trial tray 110 includes a bottom face 110d situated at the distal end 110b. The bottom face 110d of the trial tray 110 includes a first slot 111. In an embodiment, the first slot 111 is located centrally on the bottom face 110d of the trial tray 110. In an embodiment, the first slot 111 covers a partial length of the bottom face 110d and extends from a periphery of the bottom face 110d towards the center of the trial tray 110. In an embodiment, the first slot 111 extends beyond the center of the trial tray 110 by a pre-defined distance (shown in Fig. 2B). The first slot 111 may have a pre-defined shape. In an embodiment, the first slot 111 has a T-shaped cross-section. The first slot 111 is configured to accommodate the post 120 (explained later).
[26] The bottom face 110d of the trial tray 110 is provided with a plurality of grooves. Each groove corresponds to an offset position of a plurality offset positions that the humeral trial assembly 100 is able to realize. The number of plurality of grooves corresponds to the number of the offset positions. In the depicted embodiment, the trial tray 110 is provided with three grooves 112a, 112b and 112c (shown in Fig. 2B), hereinafter interchangeably referred to as a first groove 112a, a second groove 112b and a third groove 112c. Each of the grooves 112a - 112c represents a corresponding offset position, namely, a first offset, a second offset and a third offset, respectively. According to an embodiment, the first offset corresponds to 0 mm, the second offset corresponds to +3 mm and the third offset corresponds to + 6mm. The grooves 112a, 112b, 112c may be carved on the bottom face 110d of the trial tray 110. The spacing between adjacent grooves of the grooves 112a - 112c depends upon the distance between corresponding offset positions.
[27] It should be noted that the number of grooves and the specific offset positions illustrated herein are merely exemplary and any number of grooves may be provided to realize the desired number of offset positions without deviating from the scope of the present disclosure.
[28] The grooves 112a - 112c may have a pre-defined cross-sectional shape, such as, without limitation, semi-circular, triangular, rectangular, square, etc. In an example implementation, the grooves 112a - 112c have a semi-circular cross-section. The grooves 112a, 112b, 112c extend longitudinally for at least a partial width of the bottom face 110d of the trial tray 110. In an embodiment, the grooves 112a, 112b, 112c extend longitudinally on the bottom face 110d for the entire width of the bottom face 110d and intersects the first slot 111 at a pre-defined angle. In an embodiment, the first slot 111 and the grooves 112a, 112b, 112c are perpendicular to each other. Each of the grooves 112a, 112b, 112c includes a cut-out portion provided on either side of the first slot 111. The cut-out portions help in fixing the post 120 with the trial tray 110 (explained later).
[29] The trial tray 110 may optionally be provided with a slanted face 110e. The slanted face 110e is positioned at the periphery of the bottom face 110d of the trial tray 110. The slanted face 110e facilitates the insertion of the post 120 into the first slot 111.
[30] The trial tray 110 may optionally include a plurality of indicators (not shown). Each of the indicators corresponds to a corresponding offset position of the plurality of offset positions. During a medical procedure, the plurality of indicators helps in visually guiding a surgeon to couple the post 120 at a desired offset position. The plurality of indicators may be provided on the slanted face 110e, adjacent a respective groove of the plurality of grooves of the trial tray 110.
[31] The trial tray 110 includes a base 116 (shown in Fig. 2C). A wall 113 may extend upwards from the base 116 towards the proximal end 110a of the trial tray 110 (shown in Fig. 2C). The wall 113 provides additional surface area to the trial tray 110 for contact with surrounding tissues and also contributes to provide stability and secure placement of the assembly 100 during the trial fitting. The wall 113 may be provided with a plurality of serrations 113n. The serrations 113n are carved on the outer surface of the wall 113. The serrations 113n extends for a partial width of the wall 113. The serrations 113n may have a shape, such as, without limitation, plus, cross, zig - zag, circle, etc. In an embodiment, the serrations 113n are shaped in the form of a plus sign. The serrations 113n may be distributed uniformly or non-uniformly around the circumference of the wall 113. In an embodiment, the serrations 113n are uniformly distributed around the circumference of the wall 113. The serrations 113n facilitate the surgeon to grip the assembly 100 more easily and securely during the surgical procedure, thereby, reducing the risk of slippage.
[32] The wall 113 includes a cavity 114 (as shown in Fig. 2C). The cavity 114 may have a shape such as, without limitation, oval, circular, spherical, rectangular, square, etc. In an embodiment, the cavity 114 is oval shaped with flat sides situated diametrically opposite from each other. The cavity 114 is provided with two slots 114n, with each of the slots 114n situated on a respective flat side of the cavity 114. The slots 114n may have a shape such as, without limitation, square, rectangular, arc, etc. In an embodiment, the slots 114n are rectangular. The slots 114n are provided for fixation with the bearing (not shown in fig). The wall 113 includes a first protrusion 114a and a second protrusion 114b. The first protrusion 114a is situated on an inner surface of the wall 113 and the second protrusion 114b extends upwards from the wall 113. The first protrusion 114a and the second protrusion 114b may have a shape, such as, without limitation, square, rectangular, semi-circular, etc. In an embodiment, the first protrusion 114a and the second protrusion 114b are cuboidal. In an embodiment, the cavity 114 is configured to receive a glenoid component (not shown) of the shoulder replacement system. The slots 114n, the first protrusion 114a, and the second protrusion 114b act as a locking mechanism and helps in proper securing of the modular tab during shoulder replacement procedures.
[33] The base 116 may optionally be provided with a U-shaped slot 115. The U-shaped slot 115 is situated towards the wall 113 on the base 116.
[34] Figs. 3A-3B depict various views of the post 120, according to an embodiment. The post 120 has a proximal end 120a and a distal end 120b. The proximal end 120a of the post 120 has a proximal face 120a1. The post 120 is slidably coupled to the trial tray 110. The post 120 has a body 120c. In an embodiment, the body 120c is cylindrical, though the body 120c may have any other shape. The body 120c may have a taper from the proximal end 120a towards the distal end 120b of the post 120. The distal end 120b of the post 120 has a tapered face 120b1. The tapered face 120b1 helps in better fixation with the bone. The post 120 may be made of a material, such as, without limitation, Polyphenylsulfone (PPSU), Polypropylene, ultra-high molecular weight polyethylene (UHMWP), Polyoxymethylene Copolymer (POM-C) or any other biocompatible medical grade poly material. In an embodiment, the post 120 is made of UHMWP.
[35] The post 120 includes a first protrusion 121 provided on the proximal face 120a1 of the post 120. The first protrusion 121 is arranged centrally on the proximal face 120a1 of the post 120. The first protrusion 121 fits in the first slot 111 of the tray trial 110 and is slidable along the length of the first slot 111. The first protrusion 121 may have a cross-sectional shape and dimensions corresponding to a cross-sectional shape and dimensions of the first slot 111 of the trial tray 110. In an embodiment, the first protrusion 121 is T-shaped (shown in Fig. 3B). The cut-out portion of each of the grooves 112a - 112c is configured to receive a portion of the first protrusion 121. The post 120 further includes a pair of second protrusions 122 provided on the proximal face 120a1. The pair of second protrusions 122 are arranged perpendicular to the first protrusion 121 and are provided on either side of the first protrusion 121. The pair of second protrusions 122 are centrally aligned on the proximal face 120a1 of the post 120. The pair of second protrusions 122 may have a pre-defined cross-sectional shape, such as, without limitation, semi-circular, triangular, rectangular, square, etc. In an example implementation, the pair of second protrusions 122 have a semi-circular cross-section. The pair of second protrusions 122 are configured to engage with the grooves 112a, 112b, 112c of the trial tray 110. The pair of second protrusions 122 are configured to fit inside the grooves 112a - 112c. In an assembled state of the assembly 100, the first protrusion 121 is disposed within the first slot 111 of the trial tray 110 and the pair of second protrusions 122 mate with one of the grooves 112a - 112c, thereby achieving a corresponding offset position. The grooves 112a, 112b, 112c and the pair of second protrusions 122 are designed such that the pair of second protrusions 122 snugly fit into any of the grooves 112a - 112c, ensuring a precise and secure fit between the post 120 and the grooves 112a, 112b, 112c. Further, a portion of the first protrusion 121 fits in the cut-out portion of the corresponding groove of the grooves 112a - 112c. The aforesaid coupled helps in effectively locking the post 120 in place, preventing any unintentional movement or slippage of the post 120 during the surgical procedure.
[36] Fig. 4 - Fig. 5 depict different views of the trial tray 110 and the post 120 assembled together. To assemble the post 120 with the trial tray 110, the first protrusion 121 of the post 120 is aligned with and inserted into the first slot 111 of the trial tray 110. A surgeon slides the post 120 along the first slot 111 until the pair of second protrusions 122 of the post 120 aligns with a desired groove of the grooves 112a - 112c. The desired groove corresponds to the desired offset position. When the pair of second protrusion 122 of the post align with the desired groove, the pair of second protrusions 122 engage with the desired groove via a snap-fit mechanism, creating a friction lock (as shown in Fig. 5). The post 120 may then be released. The friction lock between the pair of second protrusions 122 and the desired groove (e.g., any of the grooves 112a - 112c) prevent further movement of the post 120 in the lateral direction. Further, the engagement of the first protrusion 121 of the post 120 with the first slot 111 of the trial tray 110 prevents any downward movement of the post 120. Thus, the proposed designed prevents any unintentional movement or slippage of the post 120 during the surgical procedure and ensures that the post 120 remains securely in position, maintaining the desired offset position without the need for any additional fastening and/or locking components.
[37] Once the post 120 is locked at one desired offset position, the post 120 may be lifted slightly and a controlled force may be applied on the post 120 to unlock the post 120. The post 120 may then be slid to another groove of the grooves 112a - 112c to set the post 120 to another offset position. Once the post 120 aligns with the other groove, the locking mechanism locks the post 120 with the other groove, realizing a corresponding offset position. For example, the surgeon may slide the post 120 until the post 120 aligns and engages with the third groove 112c to realize the third offset (e.g., + 6 mm offset in the depicted embodiment). The surgeon may slide the post 120 further to engage with the second groove 112b to realize the second offset (e.g., + 3 mm offset in the depicted embodiment). Similarly, the surgeon may slide the post 120 further to engage with the first groove 112a to realize the first offset (e.g., 0 mm offset in the depicted embodiment). Figs. 4 - 5 depict the coupling of the post 120 with the trial tray 110 at the 0 mm offset position.
[38] The humeral trial assembly of the present disclosure provides multiple advantages of over conventional trial assemblies. For example, the proposed humeral trial assembly is able to provide multiple offset options in a single assembly. The use of a single trial tray to obtain multiple offset options reduces the number of components required during a surgical procedure. This not only decreases the cost but also reduces efforts for sterilizing multiple components. Further, proposed humeral trial assembly eliminates the need for implanting and removing multiple trial trays with different offsets during the surgical procedure. This reduces the time for the surgery and enhances the efficiency of the surgical procedure. Moreover, the humeral trial assembly is designed such that the position of the post can be adjusted easily, quickly and precisely while maintaining the overall stability of the humeral trial assembly, thereby enhancing the overall usability.
[39] The scope of the invention is only limited by the appended patent claims. More generally, those skilled in the art will readily appreciate that all parameters, dimensions, materials, and configurations described herein are meant to be exemplary and that the actual parameters, dimensions, materials, and/or configurations will depend upon the specific application or applications for which the teachings of the present invention is/are used. , Claims:WE CLAIM:
1. A humeral trial assembly (100) comprising:
a. a trial tray (110) comprising:
i. a first slot (111) located on a bottom face (110d) of the trial tray (110) and extends from a periphery of the bottom face (110d) towards a center of the trial tray (110); and
ii. a plurality of grooves (112a, 112b, 112c) provided on the bottom face (110d) and extending longitudinally for at least a partial width of the bottom face (110d) and intersecting the first slot (111) at a pre-defined angle, each groove (112a, 112b, 112c) of the plurality of grooves corresponds to an offset position of a plurality of offset positions;
b. a post (120) slidably coupled to the trial tray (110), the post (120) comprising:
i. a first protrusion (121) provided on a proximal face (120a1) of the post (120), the first protrusion (121) is configured to fit in the first slot (111) of the trial tray (110) and is slidable along the first slot (111); and
ii. a pair of second protrusions (122) provided on the proximal face (120a1) of the post (120) and disposed on either side of the first protrusion (121), the pair of second protrusions (122) configured to engage with the plurality of grooves (112a, 112b, 112c);
wherein in an assembled state, the first protrusion (121) is disposed within the first slot (111) and the pair of second protrusions (122) mate with one of the plurality of grooves (112a, 112b, 112c), thereby achieving a corresponding offset position.
2. The humeral trial assembly (100) as claimed in claim 1, wherein the trial tray (110) comprises a base (116) and a wall (113) extending from the base (116) towards a proximal end (110a) of the trial tray (110), the wall (113) defining a cavity (114) configured to receive a glenoid component;
3. The humeral trial assembly (100) as claimed in claim 1, wherein the first slot (111) and the first protrusion (121) have a T-shaped cross-section.
4. The humeral trial assembly (100) as claimed in claim 1, wherein the plurality of grooves (112a, 112b, 112c) and the pair of second protrusions (122) have a semi-circular cross-section.
5. The humeral trial assembly (100) as claimed in claim 1, wherein the plurality of grooves (112a, 112b, 112c) extend for the entire width of the bottom face (110d) of the trial tray (110).
6. The humeral trial assembly (100) as claimed in claim 1, wherein the first slot (111) and the plurality of grooves (112a, 112b, 112c) are perpendicular to each other.
7. The humeral trial assembly (100) as claimed in claim 1, wherein the plurality of grooves (112a, 112b, 112c) comprises a first groove (112a), a second groove (112b) and a third groove (112c) representing a first offset, a second offset and a third offset, respectively.
8. The humeral trial assembly (100) as claimed in claim 1, wherein each of the plurality of grooves (112a, 112b, 112c) comprises a cut-out portion provided on either side of the first slot (111) and configured to receive a portion of the first protrusion (121).
9. The humeral trial assembly (100) as claimed in claim 1, wherein the pair of second protrusions (122) are arranged perpendicular to the first protrusions (121).
10. The humeral trial assembly (100) as claimed in claim 1, wherein the wall (113) includes a first protrusion (114a) situated on the inner surface and a second protrusion (114b) extending upwards from the wall (113).
11. The humeral trial assembly (100) as claimed in claim 1, wherein the wall (113) is provided with a plurality of serrations (113n) on an outer circumference of the wall (113).
12. The humeral trial assembly (100) as claimed in claim 1, wherein the trial tray (110) comprises a plurality of indicators, each of the plurality of indicators represents a corresponding offset position of the plurality of offset positions.

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