SHOULDER ARTHOPLASTY HUMERAL TRAY AND LINER TRIAL IMPLANT

Abstract

TITLE OF INVENTION: SHOULDER ARTHOPLASTY HUMERAL TRAY AND LINER TRIAL IMPLANT The present disclosure discloses, a trial implant (100) comprising, a liner (110), a base (130) and a pawl and ratchet assembly (150). The liner (110) comprises a curved mating surface (110a) configured to interface with a prosthetic glenoid ball. The base (130) is configured to be coupled with a humeral stem implant. The base (130) is in rotational and transverse slidable coupling with the liner (110). The pawl and ratchet assembly (150) is configured to define an axial displacement of the liner (110) with respect to the base (130). The rotation of the liner (110) with respect to the base (130) causes a change in the axial displacement of the liner (110) with respect to the base (130). The axial displacement of the liner (110) with respect to the base (130) defines a respective offset of the trial implant (100). Fig. 1

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:
SHOULDER ARTHOPLASTY HUMERAL TRAY AND LINER TRIAL IMPLANT
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
[001] The present disclosure relates to a trial assembly. More particularly, the present invention relates to a humeral tray and liner multi offset trial implant for shoulder arthroplasty.
BACKGROUND OF INVENTION
[002] The glenohumeral joint is the highly mobile ball-and-socket joint that connects the upper arm bone (humerus) to the shoulder blade (scapula). It allows for an exceptional range of motion, but it is also prone to instability due to the shallow socket. Surrounding muscles, ligaments, and tendons work together to provide support and facilitate movement. There are several medical conditions that are associated with the glenohumeral joint such as acute proximal humerus fractures, post-traumatic glenohumeral osteoarthritis, chronic irreducible shoulder dislocation, etc. The patient suffering from any of the aforementioned medical condition may face several complications such as stiffness in the joint, loss of partial or full range of motion, pain while movement and so forth.
[003] For the treatment of such medical conditions, a doctor may suggest the patient to undergo reverse total shoulder arthroplasty (RTSA). In RTSA, the ball part is implanted on the scapula and the socket is implanted on the proximal humerus.
[004] The arrangement of the socket and the ball is positioned at an offset which may depend on the anatomy of the patient to obtain the maximum range of motion. Conventionally, a trial implant is used to determine the offset before final implantation. For every offset, there is a separate trial implant. The medical practitioner has to try a number of trial implants before deciding an optimal implant with an offset that offers the maximum range of motion. Thus, the conventional method of determining the offset of the ball and the socket arrangement may increase the overall time required for the surgery and may make the procedure cumbersome.
[005] Hence, there arises a need for a trial implant that overcomes the shortcomings, associated with the conventional trial implants.
SUMMARY OF INVENTION
[006] 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 merely 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.
[007] The present disclosure discloses atrial implant comprising, a liner, a base, and a pawl and ratchet assembly. The liner comprises a curved mating surface configured to interface with a prosthetic glenoid ball. The base is configured to be coupled with a humeral stem implant. the base is in rotational and transverse slidable coupling with the liner. The pawl and ratchet assembly is configured to define an axial displacement of the liner with respect to the base. The rotation of the liner with respect to the base causes a change in the axial displacement of the liner with respect to the base. The axial displacement of the liner with respect to the base defines a respective offset of the trial implant.
BRIEF DESCRIPTION OF DRAWINGS
[008] 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.
[009] Fig. 1 depicts a trial implant 100, in accordance with an embodiment of the present disclosure.
[0010] Fig. 2 depicts a perspective view of a liner 110 of the trial implant 100, in accordance with an embodiment of the present disclosure.
[0011] Fig. 3 depicts a perspective view of a base 130 of the trial implant 100, in accordance with an embodiment of the present disclosure.
[0012] Fig. 4a depicts a cross-sectional view of the trial implant 100 in a first offset configuration, in accordance with an embodiment of the present disclosure.
[0013] Fig. 4b depicts a perspective view of the trial implant 100 in a first offset configuration in accordance with an embodiment of the present disclosure.
[0014] Fig. 4c depicts a cross-sectional view of the trail implant 100 in a last offset configuration, in accordance with an embodiment of the present disclosure.
[0015] Fig. 4d depicts a perspective view of the trial implant 100 in a last offset configuration in accordance with an embodiment of the present disclosure.
[0016] Fig. 5 depicts an exemplary method of using the trial implant 100, in accordance with an embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0017] 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.
[0018] 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.
[0019] 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.
[0020] Furthermore, the described includes, 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 includes or advantages of a particular embodiment. In other instances, additional includes and advantages may be recognized in certain embodiments that may not be present in all embodiments. These includes 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.
[0021] In accordance with the present disclosure, a trial implant is disclosed. The trail implant of the present disclosure is utilized during a reverse total shoulder arthroplasty (RTSA). In a RTSA implant procedure, the glenoid cavity is replaced with a prosthetic glenoid ball, while the humeral head is replaced with the trial implant of the present disclosure. The trial implant is used to determine an accurate position of the humeral plate of the prosthesis with respect to the prosthetic glenoid ball implanted at the glenoid cavity. The trial implant of the present disclosure includes multiple offset positions. The multiple offset positions allow a medical practitioner to determine a position of the prosthetic humeral plate with respect to the prosthetic glenoid ball that is an optimal position. This optimal position of the prosthetic humeral plate with respect to the prosthetic glenoid ball is a position in which the range of motion of the prosthetic humeral plate is maximum with respect to the patient's glenohumeral joint, and causes least or no strain on the muscles, ligaments, and tendons of the glenohumeral joint. The trial implant (or the implant) of the present disclosure thus provides a convenient and less traumatic solution.
[0022] The implant is placed on a prosthetic stem that is implanted in the proximal humerus. The face of the implant provides an articulating surface to a prosthetic ball component that is implanted on the scapula to substitute the ball and socket arrangement of the glenohumeral joint.
[0023] The humeral stem and the ball component are to be placed at a vertical or axial displacement offset with respect to each other. A certain axial displacement offset is selected that offers an optimal range of motion to the glenohumeral joint. The offset may be defined as the distance between the center of rotation of the prosthetic glenoid ball engaging interface of the trial implant and the prosthetic humeral stem.
[0024] The trial implant includes a liner, a base, and an adjustment mechanism. The liner is placed on the base. The assembly of the liner and the base forms the trial implant. The trial implant can be toggled between multiple offsets using the adjustment mechanism. The trial implant has an initial height that is defined by the combination of the height of the base and the liner. The height of the trial implant can be adjusted by increasing or decreasing axial displacement between the liner and the base, to attain different offsets. Thus, the trial implant of the present disclosure is not restricted to a single offset.
[0025] The trial implant can be toggled between multiple offsets which allows the medical practitioner to determine the most appropriate offset (or the optimal offset or the optimal position) for the patient, using a single trial implant. Thus, the use of the trial implant of the present disclosure reduces the overall time of the surgery. Further, due to the use of the single trial implant, patient trauma is significantly reduced, compared to procedures involving multiple separate trial implants having distinct offsets. The surgical procedure is also simplified by the use of the present implant as the medical practitioner does not need to repeat the process of placing and removing multiple trial implants to conclude the final offset, optimal for the patient.
[0026] Now referring to figures, Fig. 1 depicts a trial implant 100.The trial implant 100 includes a proximal end 100a and a distal end 100b. The trial implant 100 includes a liner 110, a base 130 and a pawl and ratchet assembly 150. The liner 110 and the base 130 are assembled to form the trial implant 100.
[0027] The pawl and the ratchet assembly 150 is configured to define an axial displacement of the liner 110 with respect to the base 130. The pawl and ratchet assembly 150 may be utilized for switching between multiple axial displacement offsets of the trial implant 100. In an embodiment, the pawl and ratchet assembly 150 includes a plurality of pawl 111 and ratchets 131. The pawls 111 are disposed on the liner 110 and the ratchets 131 are disposed on the base 130.
[0028] The base 130 is disposed towards the distal end 100b. The base 130 includes a shaft 130a disposed on the bottom of the base 130. The shaft 130a is configured to be coupled with the humeral stem component (not illustrated in the figures) implanted in the humerus. The shaft 130a may be coupled to the humeral stem using a method including, but not limited to snap fit, friction fit, taper fit, and so forth. In an embodiment, the shaft 130a may be provided with threads that may be configured to mate with the internal threads that may be provided on the humeral stem.
[0029] In accordance with Fig. 2, the liner 110 is illustrated. The liner 110 is disposed towards the proximal end 100a. The liner 110 makes direct contact with the prosthetic glenoid ball component implanted on the scapula. The liner 110 provides an articulating surface to the prosthetic glenoid ball component. The liner 110 may be made of a suitable material including, but not limited to ultra-high molecular weight polyethylene (UHMWPI), polymethyl methacrylate (PMMA), cross-linked poly ethylene (XLPE), and so forth. The liner 110 may be fabricated using a method including, but not limited to molding, machining, and the same. In an embodiment, the liner 110 is fabricated using machining. The liner 110 is provided with a mating surface 110a which may be curved. The mating surface 110a is configured to interface with the prosthetic glenoid ball. The mating surface 110a of the liner 110 on the proximal end 100a, has a curvature that provides an articulating surface for the prosthetic glenoidal ball component.
[0030] The liner 110 includes a central drum 110b. The central drum 110b is configured to facilitate the coupling of the liner 110 with the base 130. The shape of the central drum 110b may correspond to the shape of the base 130. In an embodiment, the central drum 110b has a cylindrical shape. The central drum 110b may be a hollow or a solid structure. In an embodiment, the central drum 110b is a solid structure. In an embodiment, the central drum 110b has a curved face 110b1. The curved face 110b1 may be configured to make contact with base 130. The diameter of the central drum 110b is less than the diameter of the bottom surface of the liner 110.
[0031] The liner 110 includes a plurality of pawls 111, a plurality of first holes 113, a plurality of second holes 115.
[0032] The pawls 111 are provided on a curved face 110b1 of the liner 110. In an embodiment, the liner 110 has two pawls 111. The pawls 111 may be positioned on diametrically opposite sides of the liner 110. Alternatively, the liner 110 may have more than two pawls 111. In such an embodiment, the pawls 111 may be arranged symmetrically and uniformly spaced apart around the circumference of the liner 110. Alternate arrangements of the pawls 111 are within the scope of the present disclosure.
[0033] The pawls 111 are employed to slidably couple the liner 110 with the base 130. The pawls 111 mate with the ratchets 131 (explained later in conjunction with Fig. 3). The pawl 111 may have a predefined length. The length of the pawl 111 may range from 1mm to 20mm. In an embodiment, the length of each pawl 111 is 10mm. Each pawl 111 is provided with a bottom face 111a. The bottom face 111a has a slanted orientation. The bottom face 111a is configured to make contact with one of the steps 131a, 131b, 131c, and 131d of the corresponding ratchets 131 that correspond to a certain axial displacement offset.
[0034] The first holes 113 are provided on the curved face 110b1 of the liner 110. The first holes 113 are configured to receive a corresponding plunger 117. In an embodiment, the liner 110 is provided with at least two first holes 113. Alternatively, the liner 110 may be provided with more than two first holes 113. Each first hole 113 is positioned diametrically opposite side of the curved face 110b1 of the liner 110. The first hole 113 may have a predefined diameter. The diameter of the first hole 113 may range between 1mm and 10mm. In an embodiment, the diameter of the first hole 113 is 5mm. In an embodiment, the first holes 113 are provided with internal threads. The internal threads mate with the external threads which are provided on the plunger 117.
[0035] The plunger 117 is configured to be placed within the first hole 113. In an embodiment, the number of the plungers 117 corresponds to the number of the first holes 113. In an embodiment, there are two plungers 117 - one for each of two first holes 113. The plunger 117 is provided with external threads. The threads of the plunger 117 is configured to mate with the internal threads of the first hole 113. The plunger 117 may be employed to lock the liner 110 and the base 130 in a certain position.
[0036] The plunger 117 is configured to seat a ball 117a at one of the ends. The ball 117a may rotate within the cavity (not shown) provided in the plunger 117. The ball 117a is configured to mate with one of the locking slots 135a, 135b, 135c, and 135d in a respective position. The plunger 117 may be made of a predefined material including, but not limited to titanium, cobalt chromium, stainless steel, and a combination thereof. The plunger 117 may be provided with a spherical ball on at least one of its ends.
[0037] The second hole 115 is provided in proximity to the first hole 113 on the curved face 110b1 of the liner 110. In an embodiment, there are two second holes 115. Each second hole 115 is positioned in proximity to the respective first hole 113. In another embodiment, there may be more than two second holes 115. The second hole 115 may have a predefined diameter. The diameter of the second hole 115 may range between 1mm and 10mm. In an embodiment, the diameter of the second hole 115 is 3mm. The second hole 115 is configured to receive a pin 119.
[0038] One end of the pin 119 is disposed within the second hole 115 of the liner 110, being fixedly attached to the liner 110. The other end of the pin 119 protrudes radially outward from the second hole 115. The other end of the pin 119 sits within the slots 133 of the base 130. The pin 119 is configured to move within the slots 133. The pin 119 is employed to secure the liner 110 with the base 130, while still allowing rotation and axial displacement of the liner 110 with respect to the base 130. In an embodiment, the pin 119 has a cylindrical shape. The shape of the pin 119 may correspond to the shape of the second hole 115. In an embodiment, the diameter of the pin 119 corresponds to the diameter of the second hole 115. The pin 119 may be made of a material including, but not limited to titanium, cobalt chromium, stainless steel, and a combination thereof.
[0039] Fig. 3 depicts the base 130. The base 130 may be removably coupled to a stem (not shown) implanted within the humerus. The base 130 is made of suitable material including, but not limited to titanium, cobalt chromium, stainless steel, polymer, or a combination thereof. The base 130 may be fabricated using a method including, without limitation, molding, machining, and the like. The base 130 includes a sidewall 130b. The sidewall 130b defines the circumference of the base 130. The sidewall 130b may have a predefined thickness. The thickness of the sidewall may range between 1mm and 10mm. The sidewall 130b is provided with a plurality of slots 133, a plurality of ratchets 131, and a plurality of locking slots 135a, 135b, 135c and 135d.
[0040] The sidewall 130b is provided with the plurality of ratchets 131. The number of ratchets 131 corresponds to the number of pawls 111. The ratchets 131 may be positioned radially symmetrically around the sidewall 130b. For example, two ratchets 131 may be placed on diametrically opposite positions on the sidewall 130b. The ratchets 131 have stepped structures towards the bottom. The number of steps corresponds to the number of offset positions. In an embodiment, there are four steps, for example, a first step 131a, a second step 131b, a third step 131c, and a fourth step 131d. In another embodiment, the ratchets 131 may have more or less than four steps corresponding to the number of the offset positions.
[0041] Each step is marked with a number for example 0, 1, 2, and 3. In an embodiment, each number indicates an axial displacement offset. The trial implant 100 includes a number of axial displacements including but not limited to a zero offset including zero axial displacement of the liner 110 with respect to the base 130 which is indicated by number 0, marked on the first step 131a of the ratchet 131 and a maximum offset including maximum axial displacement of the liner 110 with respect to the base 130 which is indicated by 3, marked on the fourth step 131d of the ratchet 131. Further the trial implant 100 includes one or more intermediate offsets including a corresponding axial displacement greater than the zero axial displacement and less than the maximum axial displacement which are indicated by 1 and 2 marked on the second step 131b and third step 131c respectively. The first step 131a of the ratchet 131 corresponds to 0 offset. The other steps have an elevated height with respect to the first step 131a. The difference in height between two consecutive steps may correspond to the axial displacement between the liner 110 and the base 130. Each of the plurality of steps 131a, 131b, 131c, and 131d have a distinct height corresponding to a distinct axial displacement of the liner 110 with respect to the base 130. The top surface of the steps makes contact with the bottom face 111a of the pawl 111. The pawl 111 makes contact with one of the steps 131a, 131b, 131c, and 131d in a certain position. In each axial displacement, the pawl 111 engages with a corresponding step of the ratchet 131.
[0042] As stated above, the sidewall 130b is provided with a plurality of slots 133. The slots 133 are positioned on the side of the sidewall 130b being diametrically opposite to each other. The slots 133 have a shape corresponding to the stepped shape of the ratchets 131. The slots 133 are configured to receive the pins 119. The pins 119 rest on the steps of the slots 133. The pins 119 may be configured to move within the slots 133. The pins 119 rest on one of the steps of the slots 133 in a respective offset. In the 0 offset position, the pins 119 rest in the first steps of the corresponding slots 133. The pin 119 slide or/and roll from one step to the other during the transition between the offsets. The pins 119 facilitate the transition between the offsets the pins 119 being coupled with the liner 110 provide support to the liner 110 during the transition between the offsets. As the pins 119 are disposed within the slots 133, the pin 119 and the slot 133 collectively secure the liner 110 with the base 130.
[0043] The internal side of the sidewall 130b is provided with the plurality of locking slots, for example, a first locking slot 135a, a second locking slot 135b, a third locking slot 135c, and a fourth locking slot 135d. The locking slots are provided on symmetrically opposite sides. The locking slots 135 have a concave hemispherical shape. In another embodiment, the locking slots 135 may have any other suitable shape. In an embodiment, the diameter of the locking slots 135 corresponds to the diameter of the ball 117a of the plunger 117. The locking slots 135 are configured to mate with the ball 117a of the plunger 117. The locking slots 135 are employed to lock the liner 110 and the base 130 in a certain position.
[0044] In accordance with Fig. 5 an exemplary method 200 of using the trial implant 100 is depicted.
[0045] At step 201, the trial implant 100 is assembled in a way that the base 130 and the liner 110 remain in rotational and transverse slidable coupling. The plungers 117 are placed within the first holes 113. The liner 110 is assembled with the base 130, then the pins 119 are inserted through the corresponding slots 133 and disposed within the respective second holes 115. The bottom face 111a of the pawl 111 at least partially makes contact with the respective ratchet 131. In the initial position i.e., at '0' offset, the balls 117a of the plunger 117 mate with the first locking slot 135a, and the pawls 111 engage with the first step 131a of the ratchet 131 The pin 119 seats on the first step of the slots 133.
[0046] At step 203the offset is adjusted. A medical practitioner adjusts the offset. The trial implant 100 may be set to be at the initial offset of 0mm. To adjust the offset, the medical practitioner may rotate the liner 110 with respect to the base 130 in the clockwise direction. The rotation of the liner 110 with respect to the base 130 causes a change in the axial displacement of the liner 110 with respect to the base 130. The rotation of the liner 110 causes the pawls 111 to engage with the second step 131b of the ratchets 131. Since the position of the second step 131b is higher compared to the first step 131a, the liner 110 moves in the upward direction with respect to the base 130. The pin 119 moves from the first step of the slot 133 to the second step. The ball 117a mates with the second locking slot 135b to lock the liner 110 in the second offset of 1mm. The subsequent rotation of the liner 110 may toggle the offset from 1mm to 2mm and so forth. In an embodiment, there are four offsets for example 0mm, 1mm, 2mm, and 3mm. Another embodiment may have more or less than four offsets for example, 0mm, 1mm, 2mm, 3mm, 4mm, and so forth.
[0047] 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 trial implant (100) comprising:
a liner (110) comprising a curved mating surface (110a) configured to interface with a prosthetic glenoid ball;
a base (130) configured to be coupled with a humeral stem implant, the base (130) being in rotational and transverse slidable coupling with the liner (110); and
a pawl and ratchet assembly (150) configured to define an axial displacement of the liner (110) with respect to the base (130);
wherein rotation of the liner (110) with respect to the base (130) causes a change in the axial displacement of the liner (110) with respect to the base (130).
2. The trial implant (100) as claimed in claim 0, wherein the pawl and ratchet assembly (150) comprises:
at least one pawl (111) disposed on the liner (110); and
at least one ratchet (131) disposed on the base (130),
wherein the ratchet (131) comprises a plurality of steps (131a, 131b, 131c, and 131d),
wherein each of the plurality of steps (131a, 131b, 131c, and 131d) have a distinct height corresponding to a distinct axial displacement of the liner (110) with respect to the base (130).
3. The trial implant (100) as claimed in claim 0, wherein the axial displacement may be one of:
a zero offset comprising zero axial displacement of the liner (110) with respect to the base (130),
a maximum offset comprising maximum axial displacement of the liner (110) with respect to the base (130), and
one or more intermediate offsets comprising a corresponding axial displacement greater than the zero axial displacement and less than the maximum axial displacement.
4. The trial implant (100) as claimed in claim 1, wherein the axial displacement is one of 0mm, 1mm, 2mm and 3mm.
5. The trial implant (100) as claimed in claim 0, further comprising:
one or more locking slots (135a, 135b, 135c, and 135d) on the side wall 130b,
a ball (117a) configured to mate with the one or more locking slots (135a, 135b, 135c, and 135d), to lock the axial displacement of the liner (110) with respect to the base (130).
6. The trial implant (100) as claimed in claim 5, further comprising a threaded plunger (117) configured to seat the ball (117a) within one of the one or more locking slots (135a, 135b, 135c, and 135d).
7. The trial implant (100) as claimed in claim 1, further comprising:
a pin (119) is disposed on a sidewall of the liner (110); and
a slot (133) is disposed on a sidewall of the base (130);
wherein the pin (119) is configured to move within the slot (133), and
wherein the pin (119) and slot (133) are collectively configured to secure the liner (110) with the base (130).
8. The trial implant (100) as claimed in claim 1, wherein the base (130) further comprises a shaft (130a) configured to couple the base (130) with a humeral stem implant.
9. The trial implant (100) as claimed in claim 1, wherein the liner (110) is constructed from a polymer, including ultra-high molecular weight polyethylene (UHMWPE), highly crosslinked polyethylene (HXLPE), or polymethyl methacrylate (PMMA).
10. The trial implant (100) as claimed in claim 0, wherein the base (130) is constructed from one of polymer, titanium, cobalt chromium, or stainless steel.

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