CN115444627A - Assembled dislocation-preventing acetabular implant and implantation method - Google Patents

Abstract

The invention discloses a matched stack type dislocation prevention acetabulum implant and an implantation method, belonging to the technical field of medical instruments, wherein the implant comprises an acetabulum cup and a lining body, wherein the lining body consists of a lining and a lining edge; the acetabulum cup is provided with an outer assembly conical surface, the lining is provided with an inner assembly conical surface, the outer assembly conical surface is provided with a first clamping groove, the first clamping groove is internally embedded with a first clamping bulge, the outer assembly conical surface is also provided with a second clamping groove, and the second clamping groove is internally embedded with a second clamping bulge; the implant also comprises an anti-dislocation ring, a wire clamping ring and non-absorbable sutures, wherein one end of each non-absorbable suture is tied on the anti-dislocation ring, and the other end of each non-absorbable suture is embedded between a lug of the wire clamping ring and the acetabular cup. The invention adopts a combination mode to form the lining body which is fittingly embedded in the acetabular cup, adopts the dislocation prevention ring, the thread clamping ring and the non-absorbable suture to carry out selective implantation according to the motion degree requirement of the hip joint of a patient, simultaneously achieves the dislocation prevention effect, adopts a detachable structure as a whole, and has rapid and convenient assembly and high flexibility.

Description

Assembled dislocation-preventing acetabular implant and implantation method

Technical Field

The invention relates to the technical field of medical instruments, in particular to a matched assembled anti-dislocation acetabulum implant and an implantation method.

Background

Artificial hip replacement or revision surgery is the most successful primary surgical procedure for treating hip arthritis or its complications in recent decades. The acetabular liner that fits is also different due to patient articulation. Most enterprises take the liner and the liner edge as finished products to be processed and molded at one time when producing the acetabulum liner, the condition does not meet the requirement of market diversification, the production difficulty is increased, the material waste after failure is easily caused, and the overall effect is poor; meanwhile, dislocation between joints is a main reason for failure after artificial hip joint replacement, and the dislocation can bring heavy physiological and psychological burdens to patients. Accordingly, the invention provides a matched assembly type dislocation prevention acetabulum implant and an implantation method.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned deficiencies in the prior art and to provide a combination type dislocation prevention acetabular implant and an implantation method.

In order to solve the technical problem, the invention aims to realize that: the invention relates to an assembled dislocation-preventing acetabular implant, which comprises an acetabular cup and a lining body which is embedded in the acetabular cup in an adapting mode, wherein the lining body consists of a lining and a lining edge; the inner wall surface of the acetabular cup is provided with an outer assembly conical surface, the outer wall surface of the lining is provided with an inner assembly conical surface matched with the outer assembly conical surface, a first clamping groove far away from the rim of the acetabular cup is arranged on the outer assembly conical surface, a first clamping bulge arranged on the inner assembly conical surface is embedded in the first clamping groove, a second clamping groove close to the rim of the acetabular cup is further arranged on the outer assembly conical surface, and a second clamping bulge arranged on the outer side surface of the lining edge is embedded in the second clamping groove.

The invention is further configured to: the end face, close to the lining edge, of the lining is provided with an alignment groove, the end face, close to the lining edge, of the lining edge is provided with an alignment boss, and the alignment boss is embedded in the alignment groove.

The invention is further configured to: the number of the first clamping grooves is two, and an interval included angle between every two adjacent first clamping grooves is 180 degrees.

The invention is further configured to: one of the first clamping grooves is connected with a guide groove, one end of the guide groove is connected with the first clamping groove, the other end of the guide groove extends to the mouth of the acetabular cup, and a guide block arranged on the first clamping protrusion is slidably connected in the guide groove.

The invention is further configured to: and the outer assembly conical surface is provided with a plurality of second clamping grooves which are distributed around the axis of the outer assembly conical surface in an annular array at equal intervals.

The invention is further configured to: the anti-dislocation device also comprises an anti-dislocation ring, a non-absorbable suture and a thread clamping ring; the anti-dislocation ring is arranged at the mouth of the acetabular cup, the wire clamping ring is clamped on the acetabular cup, a wire clamping ring lug is arranged on the inner wall of the wire clamping ring, one end of the non-absorbable suture is tied on the anti-dislocation ring, and the other end of the non-absorbable suture is embedded between the wire clamping ring lug and the acetabular cup.

The invention is further configured to: the anti-dislocation ring is provided with an opening part, one end of the opening part is provided with a third clamping groove, and the other end of the opening part is provided with a third clamping bulge matched with the third clamping groove; the anti-dislocation ring is provided with mounting holes positioned at two sides of the opening part.

The invention is further configured to: the anti-dislocation ring is provided with a plurality of wire grooves surrounding the anti-dislocation ring, the interval included angles between every two adjacent wire grooves are equal, and the non-absorbable suture is tied in the wire grooves.

The invention is further configured to: the inside lining limit includes plain edge inside lining limit and high limit inside lining limit, and high limit inside lining limit has the high limit spacing portion that is close to edge and protrusion terminal surface, and the height of high limit spacing portion is L, and anticreep position ring thickness is H, and inside lining internal surface radius is R, and femoral stem mobility is ROM, and femoral neck width is H, and a is the circular arc angle that high limit rotated, and b is terminal surface and femoral neck axis contained angle, and the femoral head centre of sphere is s with inside lining limit terminal surface distance, and c corresponds the central angle on inside lining limit for s, when adding the anticreep position ring, satisfies the formula:

ROM＝180-a-2b-c

namely:

the height of plain edge inside lining limit is 0, and inside lining surface radius is R, and femoral stem mobility is ROM, and thighbone neck width is H, and femoral head centre of sphere is s with inside lining limit terminal surface distance, and c is the central angle that s corresponds the inside lining limit, when adding the anticreep position ring, satisfies the formula:

ROM＝180-2b-2c

namely:

the invention also relates to an implanting method for implanting the liner and the liner edge in the assembled anti-dislocation acetabular implant into the acetabular cup, which comprises the following steps:

s1, firstly, implanting an acetabular cup into an acetabular fossa of a patient;

s2, taking the lining, aligning the bottom of the lining with the mouth of the acetabular cup, rotating the lining in the circumferential direction appropriately, aligning the guide block with the guide groove, applying pressure in the axial direction, embedding the lining into the acetabular cup, and sliding the guide block in the guide groove until the first clamping protrusion is embedded into the first clamping groove;

s3, selecting lining edges with different specifications and models according to actual requirements;

s4, taking the liner edge, aligning the aligned bosses on the liner edge with the aligned grooves, rotating the liner edge in a proper circumferential direction to align the second clamping protrusions with the corresponding second clamping grooves, applying pressure in an axial direction, embedding the aligned bosses into the aligned grooves until the second clamping protrusions are embedded into the second clamping grooves, and completing the implantation of the liner and the liner edge into the acetabular cup;

s5, tying one end of the non-absorbable suture to the anti-dislocation ring wire groove and tying the other end of the non-absorbable suture to the wire clamping ring lug in vitro, and then clamping and fixing the wire clamping ring and the acetabular cup;

s6, the anti-dislocation ring is installed by using the anti-dislocation ring installing pliers through Kong Chengkai, so that the femoral stem provided with the femoral head integrally penetrates through the anti-dislocation ring, and then the anti-dislocation ring is closed.

In conclusion, the invention has the following beneficial effects:

1. the liner body which is adaptive to be embedded in the acetabular cup is formed in a matching mode, matching implantation can be carried out according to the activity requirement of the hip joint of a patient, the whole body adopts a detachable structure, the assembly is rapid and convenient, and the flexibility is high;

2. the cup mouth of the acetabular cup is additionally provided with an anti-dislocation structure for preventing the femoral stem from dislocating, and the anti-dislocation structure is flexibly connected with the acetabular cup, so that a good anti-dislocation effect of the femoral stem can be still achieved under the condition of ensuring the mobility of the hip joint of a patient;

3. the acetabulum implant is convenient to integrally combine by adopting a quick positioning and multi-clamping structure, and is also beneficial to human body implantation.

Drawings

FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present invention;

FIG. 2 is a schematic view of the internal structure of embodiment 1 of the present invention;

FIG. 3 is a schematic view of the acetabular cup of the invention;

FIG. 4 is a schematic view of the structure of FIG. 3 from another perspective;

FIG. 5 is a schematic structural view of a liner embodying the present invention;

FIG. 6 is a schematic view of the structure of FIG. 5 from another perspective;

FIG. 7 is a schematic view of a high edge strip of the present invention;

FIG. 8 is a schematic view of another high-side liner of the present invention;

FIG. 9 is a schematic view of the overall structure of embodiment 2 of the present invention;

FIG. 10 is a schematic view of the structure for embodying the wire-clamping ring of the present invention;

FIG. 11 is an enlarged view of the portion A of FIG. 10;

FIG. 12 is a schematic view of a configuration embodying the invention for anti-dislocation loops and non-absorbable sutures;

fig. 13 is a schematic view of the present invention in terms of hip joint motion.

Detailed Description

For a better understanding of the technical solutions of the present invention, the following preferred embodiments of the present invention are described in conjunction with the specific examples, but it should be understood that the descriptions are only for the purpose of further illustrating the features and advantages of the present invention, and are not intended to limit the patent claims of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

The invention will be further described with reference to the drawings and preferred embodiments.

Example 1

Referring to fig. 1 to 8, the assembled dislocation prevention acetabular implant according to the present embodiment includes an acetabular cup 1 and a liner adapted to be embedded in the acetabular cup 1, wherein the liner is composed of a liner 2 and a liner 3; the inner wall surface of the acetabular cup 1 is provided with an outer assembly conical surface 4, the outer wall surface of the lining 2 is provided with an inner assembly conical surface 5 matched with the outer assembly conical surface, the outer assembly conical surface 4 is provided with a first clamping groove 6 far away from the rim of the acetabular cup, the first clamping groove 6 is embedded with a first clamping bulge 7 arranged on the inner assembly conical surface, the outer assembly conical surface 4 is further provided with a second clamping groove 8 close to the rim of the acetabular cup, and the second clamping groove 8 is embedded with a second clamping bulge 9 arranged on the outer side surface of the lining edge.

Furthermore, an alignment groove 10 is formed in the end face, close to the lining edge, of the lining 2, an alignment boss 11 is arranged on the end face, close to the lining edge, of the lining 3, and the alignment boss 11 is embedded in the alignment groove 10.

Furthermore, the number of the first clamping grooves 6 is two, and an included angle between every two adjacent first clamping grooves 6 is 180 degrees.

Furthermore, one of the first clamping grooves 6 is connected with a guide groove 12, one end of the guide groove 12 is connected with the first clamping groove 6, the other end of the guide groove 12 extends to the cup mouth of the acetabular cup 1, and a guide block 13 arranged on the first clamping protrusion 7 is connected in the guide groove 12 in a sliding manner.

Furthermore, a plurality of second clamping grooves 8 distributed around the axis of the outer assembly conical surface 4 in an annular array at equal intervals are formed in the outer assembly conical surface.

In the present embodiment, the liner 2 can be quickly assembled into the acetabular cup 1 by the arrangement of the mating male and female assembly tapers 4 and 5. And the liner 2 and the acetabular cup 1 form tight connection through the connection between the first clamping protrusion 7 and the second clamping groove 8, and interference fit is established through combination.

The alignment boss 11 on the liner 3 and the alignment groove 10 on the liner 2 play a role in positioning the liner 3 in the installation process, and the second clamping protrusion 9 and the second clamping groove 8 which are matched with each other, so that the liner 3 can be quickly assembled on the acetabular cup 1, and the liner 2 is axially limited.

The acetabular cup and liner include features for securing the liner to the acetabular cup and limiting axial displacement and circumferential rotation thereof, and further include features for securing the line axis to the liner axis, the liner being secured to the acetabular cup and limiting relative movement thereof.

Wherein, the acetabulum cup can be made of materials meeting the standards of the pharmaceutical industry. For example, the acetabular cup may be constructed from titanium alloy bar stock, forged titanium alloy, cobalt chromium molybdenum alloy, stainless steel, or other biocompatible materials. In addition, the acetabular cup outer spherical surface is coated with a biological coating for promoting bone tissue ingrowth or improved acetabular cup retention in the human acetabulum. For example, the coating structure may be a porous coating, a microporous coating. The coating process can be plasma spraying coating, sintering coating, electrophoretic deposition coating. The coating can be a single layer or a composite coating.

Wherein the liner is adapted to fit within the interior space of the acetabular cup and engage the inner surface of the acetabular cup, and the liner rim is adapted to fit within the liner and acetabular cup and establish an interference fit. The liner and the outside of the liner have tapered surfaces configured to engage the inner taper of the acetabular cup. The conical surfaces of the acetabular cup and liner rim facilitate secure engagement of the three components. In this embodiment, the taper angle is about 18 degrees.

The intersection or edge of the inner conical surface and the end surface is provided with a fillet or a bevel. The chamfer facilitates insertion of the liner and liner into the acetabular cup.

The liner may be formed of a polymeric material such as polyethylene, highly crosslinked ultra high molecular weight polyethylene, polyethylene containing vitamin E, or other suitable polymer.

Example 2

With reference to fig. 9 to 12, a modular anti-dislocation acetabular implant according to the present embodiment is further provided, based on embodiment 1, with an anti-dislocation ring 14, a non-absorbable suture 15 and a suture-locking ring 16; the anti-dislocation ring 14 is arranged at the cup mouth of the acetabular cup 1, the wire clamping ring 16 is clamped on the acetabular cup 1, the inner wall of the wire clamping ring 16 is provided with a wire clamping ring lug 22, one end of the non-absorbable suture 15 is tied on the anti-dislocation ring 14, and the other end of the non-absorbable suture is embedded between the wire clamping ring lug 22 and the acetabular cup 1.

Furthermore, an opening part 17 is arranged on the anti-dislocation ring 14, one end of the opening part 17 is provided with a third clamping groove 18, and the other end of the opening part 17 is provided with a third clamping bulge 19 matched with the third clamping groove; the anti-dislocation ring 14 is provided with mounting holes 20 located at both sides of the opening 17.

Furthermore, a plurality of wire grooves 21 surrounding the anti-dislocation ring 14 are formed in the anti-dislocation ring, the interval included angles between every two adjacent wire grooves 21 are equal, and the non-absorbable suture 15 is tied in the wire grooves.

In the present embodiment, the non-absorbable suture 15 is provided to form a flexible connection between the anti-dislocation ring 14 and the acetabular cup 1, and the three are combined to form an anti-dislocation structure for preventing the femur from coming off.

Wherein, the radial section of the anti-dislocation ring 14 is rectangular. One end of the opening part 17 is provided with a third clamping groove 18, the other end of the opening part is provided with a third clamping bulge 19 matched with the third clamping groove, the third clamping groove and the third clamping bulge form a mutually matched clamping structure, mounting holes 20 on two sides are combined, and the mounting pliers are used for clamping the anti-dislocation rings through the mounting holes to enable the clamping to be closed.

The anti-dislocation ring is provided with a line groove around, and the non-absorbable suture is limited in the groove to prevent movement. The design principle of the anti-dislocation ring is as follows: the thickness of the anti-dislocation ring is h, the diameter of the wire clamping groove is p, the number of the wire clamping grooves is m, the central angle corresponding to the bayonet section is alpha, the outer diameter of the ring is slightly smaller than the radius R of the lining spherical surface, and the inner diameter of the ring which is not clamped isIs d ₁ After engagement, the inner diameter is d ₂ And satisfies the following conditions:

wherein D is the diameter of the femoral head and H is the width of the femoral neck. The anti-dislocation ring is made of high cross-linked polyethylene or polyethylene material.

The non-absorbable suture is made of high-crosslinked polyethylene material, has good mechanical property and biological property, and can not be degraded in vivo. The material meets YY 0167 standard.

The wire clamping ring is made of high-crosslinking polyethylene or medical metal materials. The snap ring secures the non-absorbable suture to the acetabular cup.

Example 3

With reference to fig. 13, in the assembled dislocation prevention acetabular implant according to the present embodiment, based on embodiment 1, the liner 3 includes a flat liner and a high liner, the high liner has a high limit stop 301 close to the edge and protruding from the end surface, the height of the high limit stop is L, the dislocation prevention ring has a thickness H, the inner surface radius of the liner is R, the femoral stem mobility is ROM, the femoral neck width is H, a is the circular arc angle rotated by the high liner, b is the angle between the end surface and the axis of the femoral neck, the distance between the femoral head spherical center and the end surface of the liner is s, and c is the central angle of the liner corresponding to s, and when the dislocation prevention ring is added, the formula is satisfied:

ROM＝180-a-2b-c

namely:

the height of plain edge welt is 0, and inside lining surface radius is R, and femoral stem mobility is ROM, and the femoral neck width is H, and femoral head centre of sphere is s with the welt terminal surface distance, and c is the central angle that s corresponds the welt, when adding the dislocation prevention ring, satisfies the formula:

ROM＝180-2b-2c

namely:

in this embodiment, the acetabular cup, liner, and liner may be provided in a variety of sizes to facilitate the selection of the appropriate size by the surgeon based on the anatomy of the patient's femur and acetabulum, wherein the type of liner may be selected by the surgeon based on the articulation of the patient. The high-side lining edge has excellent anti-dislocation effect, but the joint mobility (ROM) is small; the mobility of the plain-edge lining is relatively high, but the risk of dislocation exists, and at the moment, a doctor needs to select the plain-edge lining according to the joint of a patient.

Through the calculation of the formula, the high-edge lining edge or the flat-edge lining edge with the high-edge limiting part with the proper height can be set according to the requirements of patients.

The invention also relates to an implanting method for implanting the liner and the liner edge in the assembled anti-dislocation acetabular implant into the acetabular cup, which comprises the following key steps:

s1, firstly, implanting an acetabular cup into an acetabular fossa of a patient;

s2, taking the lining, aligning the bottom of the lining with the mouth of the acetabular cup, rotating the lining in the circumferential direction appropriately, aligning the guide block with the guide groove, applying pressure in the axial direction, embedding the lining into the acetabular cup, and sliding the guide block in the guide groove until the first clamping protrusion is embedded into the first clamping groove;

s3, selecting lining edges with different specifications and models according to actual requirements;

s4, taking the liner edge, aligning the alignment boss on the liner edge with the alignment groove, rotating the liner edge in a proper circumferential direction to align each second clamping protrusion with the corresponding second clamping groove, applying pressure in the axial direction to embed the alignment boss into the alignment groove until the second clamping protrusion is embedded into the second clamping groove, and implanting the liner and the liner edge into the acetabular cup;

s5, tying one end of the non-absorbable suture in the anti-dislocation loop groove and tying the other end of the non-absorbable suture on a wire clamping ring lug in vitro, and then clamping and fixing the wire clamping ring and the acetabular cup;

s6, the anti-dislocation ring is installed by using the anti-dislocation ring installing pliers through Kong Chengkai, so that the femoral stem provided with the femoral head integrally penetrates through the anti-dislocation ring, and then the anti-dislocation ring is closed.

The invention relates to a matched stack type dislocation prevention acetabulum implant and an implantation method, wherein a liner body which is matched and embedded in an acetabulum cup is formed in a matched stack mode, so that the liner body can be selectively implanted according to the activity requirement of hip joints of a patient, and the acetabulum implant is quick and convenient to assemble and high in flexibility due to the adoption of a detachable structure; an anti-dislocation structure for preventing the femoral stem from dislocating is additionally arranged at the cup mouth of the acetabular cup, and the anti-dislocation structure is flexibly connected with the acetabular cup, so that a good anti-dislocation effect of the femoral stem can be still achieved under the condition of ensuring the mobility of the hip joint of a patient; and a rapid positioning and multi-clamping structure is adopted, so that the acetabulum implant is convenient to integrally combine, is favorable for human body implantation, and has perfect integral functions and strong practicability.

Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated based on the actual shown orientation or positional relationship, it is only for convenience of describing the present invention and simplifying the description, but it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, therefore, the terms describing the orientation or positional relationship in the present invention are only used for exemplary illustration and are not to be construed as limiting the patent, and it is possible for a person having ordinary skill in the art to combine the embodiments and understand the specific meaning of the above terms according to the specific situation.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. The assembled dislocation-preventing acetabular implant comprises an acetabular cup and a lining body which is embedded in the acetabular cup in an adapting mode, and is characterized in that the lining body consists of a lining and a lining edge; the inner wall surface of the acetabular cup is provided with an outer assembly conical surface, the outer wall surface of the lining is provided with an inner assembly conical surface matched with the outer assembly conical surface, a first clamping groove far away from the rim of the acetabular cup is arranged on the outer assembly conical surface, a first clamping bulge arranged on the inner assembly conical surface is embedded in the first clamping groove, a second clamping groove close to the rim of the acetabular cup is further arranged on the outer assembly conical surface, and a second clamping bulge arranged on the outer side surface of the lining edge is embedded in the second clamping groove.

2. The assembled dislocation-preventing acetabular implant according to claim 1, wherein the lining has an alignment groove on an end surface thereof adjacent to the liner, and an alignment boss on an end surface thereof adjacent to the lining, the alignment boss being fitted in the alignment groove.

3. The assembled anti-dislocation acetabular implant according to claim 2, wherein the number of the first engaging grooves is two, and an included angle between two adjacent first engaging grooves is 180 °.

4. The assembled dislocation-preventing acetabular implant according to claim 3, wherein a guide groove is connected to one of the first engaging grooves, one end of the guide groove is connected to the first engaging groove, the other end of the guide groove extends to the rim of the acetabular cup, and a guide block provided on the first engaging protrusion is slidably connected to the guide groove.

5. The modular dislocation-preventing acetabular implant of claim 4, wherein the outer fitting conical surface is provided with a plurality of second engaging grooves distributed in an annular array at equal angular intervals around the axis thereof.

6. The modular anti-dislocation acetabular implant according to claim 4 or 5, further comprising an anti-dislocation ring, non-absorbable sutures, and a suture-retaining ring; the anti-dislocation ring is arranged at the mouth of the acetabular cup, the wire clamping ring is clamped on the acetabular cup, a wire clamping ring lug is arranged on the inner wall of the wire clamping ring, one end of the non-absorbable suture is tied on the anti-dislocation ring, and the other end of the non-absorbable suture is embedded between the wire clamping ring lug and the acetabular cup.

7. The assembled dislocation-preventing acetabular implant according to claim 6, wherein the dislocation-preventing ring is provided with an opening, one end of the opening is provided with a third engaging groove, and the other end is provided with a third engaging protrusion matching with the third engaging groove; the anti-dislocation ring is provided with mounting holes positioned at two sides of the opening part.

8. The assembled dislocation-preventing acetabular implant according to claim 7, wherein the dislocation-preventing ring is provided with a plurality of thread grooves for surrounding the dislocation-preventing ring, two adjacent thread grooves are spaced at equal intervals and have equal included angles, and the non-absorbable thread is tied in the thread grooves.

9. The assembled dislocation-preventing acetabular implant according to claim 8, wherein the lining edges comprise a flat edge lining edge and a high edge lining edge, the high edge lining edge has a high edge limiting part which is close to the edge and protrudes out of the end face, the height of the high edge limiting part is L, the dislocation-preventing ring thickness is H, the inner surface radius of the lining is R, the femoral stem mobility is ROM, the femoral neck width is H, a is the circular arc angle that the high edge rotates, b is the included angle between the end face and the axis of the femoral neck, the distance between the femoral head center and the end face of the lining edge is s, c is the central angle of the lining edge corresponding to s, and when the dislocation-preventing ring is added, the formula is satisfied:

ROM＝180-a-2b-c

namely:

the height of plain edge inside lining limit is 0, and inside lining surface radius is R, and femoral stem mobility is ROM, and thighbone neck width is H, and femoral head centre of sphere is s with inside lining limit terminal surface distance, and c is the central angle that s corresponds the inside lining limit, when adding the anticreep position ring, satisfies the formula:

ROM＝180-2b-2c

namely:

10. the method for implanting the liner and the rim of the modular anti-dislocation acetabular implant according to claim 8, wherein the method comprises the following steps:

s1, firstly, implanting an acetabular cup into an acetabular fossa of a patient;

s2, taking the lining, aligning the bottom of the lining with the mouth of the acetabular cup, rotating the lining in the circumferential direction appropriately, aligning the guide block with the guide groove, applying pressure in the axial direction, embedding the lining into the acetabular cup, and sliding the guide block in the guide groove until the first clamping protrusion is embedded into the first clamping groove;

s3, selecting lining edges with different specifications and models according to actual requirements;

s4, taking the liner edge, aligning the aligned bosses on the liner edge with the aligned grooves, rotating the liner edge in a proper circumferential direction to align the second clamping protrusions with the corresponding second clamping grooves, applying pressure in an axial direction, embedding the aligned bosses into the aligned grooves until the second clamping protrusions are embedded into the second clamping grooves, and completing the implantation of the liner and the liner edge into the acetabular cup;

s5, tying one end of the non-absorbable suture in the anti-dislocation loop groove and tying the other end of the non-absorbable suture on a wire clamping ring lug in vitro, and then clamping and fixing the wire clamping ring and the acetabular cup;

s6, the anti-dislocation ring mounting clamp is used for enabling the femoral stem with the femoral head to integrally penetrate through the anti-dislocation ring by mounting the anti-dislocation ring Kong Chengkai, and then the anti-dislocation ring is closed.

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