阅读说明：本技术 整形外科器械 (Orthopaedic surgical instrument ) 是由 R.弗里曼 M.里森 D.J.比德尔 K.D.布思 A.P.韦特拉莫 M.J.里斯 于 2018-12-07 设计创作，主要内容包括：本发明公开了一种用于切除患者的骨的整形外科器械。在一些实施方案中,该器械可供单个患者使用,并且可在每次外科手术结束时丢弃。(An orthopaedic surgical instrument for resecting a bone of a patient is disclosed. In some embodiments, the instrument may be used with a single patient and may be discarded at the end of each surgical procedure.)

1. An orthopaedic surgical instrument, the orthopaedic surgical instrument comprising:

a cutting block including a cutting slot sized to receive a cutting tool to guide resection of a patient's bone,

a housing coupled to the cutting block, the housing including a central slot and a pair of brackets positioned on opposite sides of the central slot,

a distal plate coupled to the housing, the distal plate including a bone engaging surface and an opening defined in the bone engaging surface and aligned with the central slot,

an elongated shaft extending from a first end positioned in the central slot,

a pair of pivot pins coupled to the elongated shaft, each pivot pin positioned in one of the pair of brackets, an

An intramedullary rod configured to be inserted into a medullary canal of the patient's bone, the intramedullary rod extending through the elongate shaft and the opening defined in the distal plate and defining a longitudinal axis extending transverse to the bone engaging surface of the distal plate,

wherein the bone engaging surface extends generally parallel to the cutting slot of the cutting block,

wherein the pivot pins cooperate to define a pivot axis about which the elongate shaft and the intramedullary rod are configured to pivot relative to the distal plate to vary the magnitude of an angle defined between the longitudinal axis and the bone engaging surface of the distal plate, and

wherein the distal plate engages the pivot pin to retain the pivot pin in the bracket of the housing.

2. The orthopaedic surgical instrument of claim 1, wherein the distal plate is formed of a metallic material and the pivot pin is formed of a plastic material.

3. The orthopaedic surgical instrument of claim 1, further comprising a plurality of fasteners securing the distal plate to the housing to clamp the pivot pin between the inner wall of the bracket and the distal plate.

4. The orthopaedic surgical instrument of claim 1, wherein the pivot pin is clamped between a distally facing inner wall of the bracket and a proximally facing surface of the distal plate.

5. The orthopaedic surgical instrument of claim 4, wherein:

each bracket includes the distally facing inner wall and a pair of side inner walls that cooperate with the distally facing inner wall to define an open-ended channel sized to receive one of the pivot pins and

each pivot pin extends outwardly from the open-ended channel of its corresponding bracket.

6. The orthopaedic instrument of claim 5, wherein the distal plate includes an arcuate central portion that engages the pivot pin extending outwardly from the open-ended channel of the bracket.

7. An orthopaedic surgical instrument, the orthopaedic surgical instrument comprising:

an intramedullary rod configured to be inserted into a medullary canal of a bone of a patient,

a housing coupled to the intramedullary rod, the housing including a pair of arms spaced apart to define an elongate slot, each arm including a first longitudinal rib formed on a proximal surface and a second longitudinal rib formed on a distal surface located opposite the proximal surface,

a translating frame configured to slide along the pair of arms, the translating frame comprising:

a first body including a central portion positioned in the elongated slot of the housing and a pair of first flanges extending outwardly from the central portion, each first flange including a proximal surface engaging the first longitudinal rib of one of the pair of arms,

a second body coupled to the first body, the second body including a pair of second flanges, and each second flange including a distal surface that engages the second longitudinal rib of one of the pair of arms to couple the first body and the second body to the housing, an

A mounting bracket coupled to the first body and the second body, an

A cutting block coupled to the mounting bracket such that the cutting block is configured to slide with the translating frame, the cutting block including a cutting slot sized to receive a cutting tool to guide resection of the patient's bone.

8. The orthopaedic surgical instrument of claim 7, wherein a pocket is defined in the proximal surface of each first flange to form a relief portion in the proximal surface.

9. The orthopaedic surgical instrument of claim 7, wherein a pocket is defined in the distal surface of each second flange to form a relief portion in the distal surface.

10. The orthopaedic surgical instrument of claim 7, wherein each longitudinal rib includes a curved outer surface.

11. The orthopaedic surgical instrument of claim 7, wherein:

the second body includes a base and an elongated shaft extending outwardly from the base through the central portion of the first body, and

the translating frame further includes a fastener secured to the elongated shaft of the second body to couple the second body to the first body.

12. The orthopaedic surgical instrument of claim 11, wherein:

the elongated shaft of the second body includes a threaded outer surface, and

the fastener includes a locking ring threadably coupled to the elongated shaft.

13. The orthopaedic surgical instrument of claim 12, wherein the locking ring is a first locking ring and the fastener includes a second locking ring threaded onto the elongate shaft to hold the first locking ring in place on the elongate shaft.

14. The orthopaedic surgical instrument of claim 7, wherein the housing and the plurality of components of the translational frame are formed from a plastic material.

15. The orthopaedic surgical instrument of claim 7, wherein:

the housing further includes a central slot spaced from the elongated slot, and a pair of brackets positioned on opposite sides of the central slot, and

the orthopaedic surgical instrument further comprises:

a distal plate coupled to the housing, the distal plate including a bone engaging surface and an opening defined in the bone engaging surface and aligned with the central slot,

an elongated shaft extending from a first end positioned in the central slot, and

a pair of pivot pins coupled to the elongated shaft, each pivot pin positioned in one of the pair of brackets, an

Wherein the intramedullary rod extends through the elongate shaft and the opening defined in the distal plate and defines a longitudinal axis extending transverse to the bone engaging surface of the distal plate,

wherein the bone engaging surface extends generally parallel to the cutting slot of the cutting block,

wherein the pivot pins cooperate to define a pivot axis about which the elongate shaft and the intramedullary rod are configured to pivot relative to the distal plate to vary the magnitude of an angle defined between the longitudinal axis and the bone engaging surface of the distal plate, and

wherein the distal plate engages the pivot pin to retain the pivot pin in the bracket of the housing.

16. The orthopaedic surgical instrument of claim 15, wherein the distal plate is formed of a metallic material and the pivot pin is formed of a plastic material.

17. The orthopaedic surgical instrument of claim 15, further comprising a plurality of fasteners securing the distal plate to the housing to clamp the pivot pin between the inner wall of the bracket and the distal plate.

18. The orthopaedic surgical instrument of claim 15, wherein the pivot pin is clamped between a distally facing inner wall of the bracket and a proximally facing surface of the distal plate.

19. The orthopaedic surgical instrument of claim 18, wherein:

each bracket includes the distally facing inner wall and a pair of side inner walls that cooperate with the distally facing inner wall to define an open-ended channel sized to receive one of the pivot pins and

each pivot pin extends outwardly from the open-ended channel of its corresponding bracket.

20. The orthopaedic instrument of claim 19, wherein the distal plate includes an arcuate central portion that engages the pivot pin extending outwardly from the open-ended channel of the bracket.

21. An orthopaedic surgical instrument, the orthopaedic surgical instrument comprising:

an intramedullary rod configured to be inserted into a medullary canal of a bone of a patient,

a frame coupled to the intramedullary rod, the frame including a base plate, an elongate shaft extending outwardly from the base plate, and a first annular groove formed on an outer surface of the elongate shaft,

a mounting bracket including a body positioned on one side of the base plate of the frame and a threaded rod coupled to the body and extending outwardly along a longitudinal axis from a passage defined in the elongated shaft,

a cutting block coupled to the mounting bracket, the cutting block including a cutting slot sized to receive a cutting tool to guide resection of the patient's bone, an

A control knob positioned over a distal end of the threaded rod of the mounting bracket, the control knob rotatable about the longitudinal axis to adjust an adjustment distance between the cutting slot of the cutting block and the base plate of the frame,

wherein the threaded rod extends into an aperture of the control knob defined by an inner wall of the control knob,

wherein the threaded rod engages a threaded hub within the aperture to couple the mounting bracket to the control knob, an

Wherein a second annular rib is formed on the inner wall of the control knob, the second annular rib engaging the first annular groove of the frame to secure the control knob and the mounting bracket to the frame.

22. The orthopaedic surgical instrument of claim 21, wherein:

the control knob includes a plurality of visual indicators corresponding to a plurality of different adjustment distances between the cutting slot of the cutting block and the body of the mounting bracket, and the frame includes an alignment guide configured to align with a first visual indicator of the plurality of visual indicators of the control knob to index the control knob to a first adjustment distance.

23. The orthopaedic surgical instrument of claim 21, wherein:

a first tab extends outwardly from the hub of the control knob,

the frame includes a second tab configured to engage the first tab at a first rotational position of the control knob and a second rotational position of the control knob, and

an angle is defined between the first rotational position and the second rotational position, the angle defining a maximum rotation of the control knob about the longitudinal axis.

24. The orthopaedic surgical instrument of claim 21, wherein:

the frame includes an inner wall defining the passage and a plurality of ribs formed on the inner wall,

the mounting bracket includes an elongated body extending outwardly from the main body to a distal end, and the threaded rod extends outwardly from the distal end to a distal tip thereof, and

the elongated body includes a pair of flat surfaces that engage the plurality of ribs to prevent rotation of the mounting bracket about the longitudinal axis.

25. The orthopaedic surgical instrument of claim 21, further comprising:

a housing coupled to the intramedullary rod, the housing including a pair of spaced apart arms to define an elongate slot, each arm including a first longitudinal rib formed on a proximal surface and a second longitudinal rib formed on a distal surface located opposite the proximal surface, wherein the frame is configured to slide along the pair of arms, the frame comprising:

a first body including a central portion positioned in the elongated slot of the housing and a pair of first flanges extending outwardly from the central portion, each first flange including a proximal surface engaging the first longitudinal rib of one of the pair of arms,

a second body coupled to the first body, the second body including the base plate, the elongated shaft, and a pair of second flanges extending from the base plate transverse to the elongated shaft, and each second flange including a distal surface that engages the second longitudinal rib of one of the pair of arms to couple the first body and the second body to the housing,

wherein the elongated shaft of the second body extends outwardly from the base plate through the central portion of the first body.

26. The orthopaedic surgical instrument of claim 25, wherein a pocket is defined in the proximal surface of each first flange to form a relief portion in the proximal surface.

27. The orthopaedic surgical instrument of claim 25, wherein a pocket is defined in the distal surface of each second flange to form a relief portion in the distal surface.

28. The orthopaedic surgical instrument of claim 25, wherein each longitudinal rib includes a curved outer surface.

29. The orthopaedic surgical instrument of claim 25, wherein the frame further comprises a fastener secured to the elongate shaft of the second body to couple the second body to the first body.

30. The orthopaedic surgical instrument of claim 29, wherein:

the elongated shaft of the second body includes a threaded outer surface positioned between the first annular groove and the base plate, and

the fastener includes a locking ring threadably coupled to the elongated shaft.

31. The orthopaedic surgical instrument of claim 30, wherein the locking ring is a first locking ring and the fastener comprises a second locking ring threaded onto the elongate shaft to hold the first locking ring in place on the elongate shaft.

32. The orthopaedic surgical instrument of claim 25, wherein the components of the housing and the frame are formed from a plastic material.

33. The orthopaedic surgical instrument of claim 25, wherein:

the housing further includes a central slot spaced from the elongated slot, and a pair of brackets positioned on opposite sides of the central slot, and

the orthopaedic surgical instrument further includes a distal plate coupled to the housing, the distal plate including a bone engaging surface and an opening defined in the bone engaging surface and aligned with the central slot,

an elongated tube extending from a first end positioned in the central slot, and

a pair of pivot pins coupled to the elongated tube, each pivot pin positioned in one of the pair of brackets, and

wherein the intramedullary rod extends through the elongate tube and the opening defined in the distal plate, the intramedullary rod defining a longitudinal axis extending transverse to the bone engaging surface of the distal plate,

wherein the bone engaging surface extends generally parallel to the cutting slot of the cutting block,

wherein the pivot pin cooperates to define a pivot axis about which the elongate tube and the intramedullary rod are configured to pivot relative to the distal plate to vary the size of an angle defined between the longitudinal axis and the bone engaging surface of the distal plate,

wherein the distal plate engages the pivot pin to retain the pivot pin in the bracket of the housing, and

wherein the control knob is operable to adjust a height between the bone engaging surface of the distal plate and the cutting slot of the cutting block.

34. The orthopaedic surgical instrument of claim 33, wherein the distal plate is formed of a metallic material and the pivot pin is formed of a plastic material.

35. The orthopaedic surgical instrument of claim 33, further comprising a plurality of fasteners securing the distal plate to the housing to clamp the pivot pin between the inner wall of the bracket and the distal plate.

36. The orthopaedic surgical instrument of claim 33, wherein the pivot pin is clamped between a distally facing inner wall of the bracket and a proximally facing surface of the distal plate.

37. The orthopaedic surgical instrument of claim 36, wherein:

each bracket includes the distally facing inner wall and a pair of side inner walls that cooperate with the distally facing inner wall to define an open-ended channel sized to receive one of the pivot pins and

each pivot pin extends outwardly from the open-ended channel of its corresponding bracket.

38. The orthopaedic instrument of claim 37, wherein the distal plate includes an arcuate central portion that engages the pivot pin extending outwardly from the open-ended channel of the bracket.

Technical Field

The present disclosure relates generally to orthopaedic surgical instruments for performing orthopaedic joint replacement procedures, and more particularly to orthopaedic surgical instruments for performing knee replacement procedures.

Background

Arthroplasty is a well-known surgical procedure by which a diseased and/or damaged natural joint may be replaced with a prosthetic joint. For example, in total knee arthroplasty, a natural knee of a patient is partially or fully replaced with a prosthetic knee or knee prosthesis. A typical knee prosthesis includes a variety of prosthetic components, including a tibial tray, a femoral component, and a polymer insert or bearing positioned between the tibial tray and the femoral component. The tibial tray generally includes a plate having a shaft extending distally therefrom, and the femoral component generally includes a pair of spaced-apart condylar elements including surfaces that articulate with corresponding surfaces of the polymeric bearing. The shaft of the tibial tray is configured to be implanted in a surgically-prepared medullary canal of a patient's tibia, and the femoral component is configured to be coupled to a surgically-prepared distal end of a patient's femur.

In any knee surgery, orthopaedic surgeons typically use a variety of different orthopaedic surgical instruments, such as cutting blocks, reamers, drill guides, and other surgical instruments, to prepare a patient's bone for receipt of a knee prosthesis.

Disclosure of Invention

In accordance with one aspect of the present disclosure, an orthopaedic surgical instrument for resecting an end of a bone of a patient is disclosed. In some embodiments, the instrument may be used with a single patient and may be discarded at the end of each surgical procedure.

In some embodiments, the instrument may house a varus/valgus pivot mechanism held in place by a datum/distal plate that clamps the pivot pin with sufficient force to allow rotation, but maintains alignment of the pivot pin and thus alignment of the distal resection plate with the intramedullary rod. The instrument includes a housing, an elongated pivot tube, a reference steel/distal plate, and a plurality of screws (e.g., 4) that are assembled to a specified torque to ensure the function and accuracy of the device.

To allow for changes in patient anatomy and femoral size, in some embodiments, the instrument also includes a translation mechanism that allows the cutting block to slide anteriorly/posteriorly (in use, downward/upward) relative to the patient's bone. In this way, the cutting block may be moved into contact with the anterior bone of the patient to allow the cutting block to be fixed in position and form a stable platform to perform the resection. According to one aspect, two bodies are used on either side of at least one arm of the instrument housing. The two bodies may be clamped together using a threaded portion with sufficient torque to ensure accuracy and still allow for slippage. To reduce friction and also allow the adjustable surface to ensure accuracy, a raised rib may be present on each arm.

In some embodiments, the translation mechanism may include a primary locking ring and a secondary locking ring. The primary lock ring locks the components securely together to ensure accuracy while allowing the cutting block to slide. Which can be assembled via a custom socket and set to a specified torque. The secondary ring serves to lock the primary ring in place to hold the primary ring in place and prevent the translation mechanism (and thus the cutting block) from angularly disengaging from the bone engaging surface of the instrument. It can also be assembled via a custom socket and set to a specified torque.

The instrument may also include a distal resection/height adjustment mechanism. In some embodiments, the mechanism may include a mounting bracket having a double-start threaded screw and an adjustment control knob. In some embodiments, the mechanism may be seated within a translation mechanism. A threaded screw may extend within the control knob and may be used to actuate the height adjustment mechanism. To provide a basis for actuation, the control knob may be snapped into place on the translation mechanism. Prior to assembly, the knob may be indexed correctly and then snapped into place, thereby ensuring that the numbers printed on the knob match the cut-out settings.

In accordance with another aspect of the present disclosure, an orthopaedic surgical instrument is disclosed that includes a cutting block including a cutting slot sized to receive a cutting tool to guide resection of a bone of a patient. The orthopaedic surgical instrument also includes a housing coupled to the cutting block, and the housing includes a central slot and a pair of brackets positioned on opposite sides of the central slot. A distal plate is coupled to the housing and includes a bone engaging surface and an opening defined in the bone engaging surface and aligned with the central slot. The orthopaedic surgical instrument also includes an elongate shaft extending from a first end positioned in the central slot, a pair of pivot pins coupled to the elongate shaft, each pivot pin positioned in one of the pair of brackets, and an intramedullary rod configured to be inserted into a medullary canal of a bone of a patient. The intramedullary rod extends through the elongate shaft and an opening defined in the distal plate to define a longitudinal axis extending transverse to the bone engaging surface of the distal plate. The bone engaging surface extends generally parallel to the cutting slot of the cutting block and the pivot pin cooperates to define a pivot axis about which the elongate shaft and the intramedullary rod are configured to pivot relative to the distal plate to vary the magnitude of an angle defined between the longitudinal axis and the bone engaging surface of the distal plate. In some embodiments, the distal plate may engage the pivot pin to retain the pivot pin in the bracket of the housing.

In some embodiments, the distal plate may be formed of a metallic material and the pivot pin may be formed of a plastic material. In some embodiments, the orthopaedic surgical instrument may further include a plurality of fasteners securing the distal plate to the housing to clamp the pivot pin between the inner wall of the bracket and the distal plate. Additionally, in some embodiments, the pivot pin may be clamped between a distally facing inner wall of the bracket and a proximally facing surface of the distal plate.

In some embodiments, each bracket may include a distally facing inner wall and a pair of side inner walls that cooperate with the distally facing inner wall to define an open-ended channel sized to receive one of the pivot pins, and each pivot pin may extend outwardly from its corresponding bracket's open-ended channel. Additionally, in some embodiments, the distal plate may include an arcuate central portion that engages a pivot pin extending outwardly from the open-ended channel of the bracket.

According to another aspect, an orthopaedic surgical instrument includes an intramedullary rod configured to be inserted into a medullary canal of a bone of a patient and an outer shell coupled to the intramedullary rod. The housing includes a pair of arms spaced apart to define an elongated slot, and each arm includes a first longitudinal rib formed on a proximal surface and a second longitudinal rib formed on a distal surface located opposite the proximal surface. The orthopaedic surgical instrument also includes a translating frame configured to slide along the pair of arms.

The translating frame includes a first body including a central portion positioned in the elongated slot of the housing and a pair of first flanges extending outwardly from the central portion. Each first flange includes a proximal surface that engages the first longitudinal rib of one of the pair of arms. The translating frame also includes a second body coupled to the first body. The second body includes a pair of second flanges, and each second flange includes a distal surface that engages the second longitudinal rib of one of the pair of arms to couple the first body and the second body to the housing. A mounting bracket is coupled to the first body and the second body, and a cutting block is coupled to the mounting bracket such that the cutting block is configured to slide with the translating frame. The cutting block includes a cutting slot sized to receive a cutting tool to guide resection of a bone of a patient.

In some embodiments, a pocket may be defined in the proximal surface of each first flange to form a relief portion in the proximal surface. Additionally, in some embodiments, a pocket can be defined in the distal surface of each second flange to form a relief portion in the distal surface.

In some embodiments, each longitudinal rib may include a curved outer surface.

In some embodiments, the second body can include a base and an elongate shaft extending outwardly from the base through a central portion of the first body. The translating frame can further include a fastener secured to the elongate shaft of the second body to couple the second body to the first body. Additionally, in some embodiments, the elongate shaft of the second body can include a threaded outer surface and the fastener can include a locking ring threadably coupled to the elongate shaft.

In some embodiments, the locking ring can be a first locking ring and the fastener can include a second locking ring threaded onto the elongate shaft to hold the first locking ring in place on the elongate shaft.

In some embodiments, the components of the housing and the translational frame may be formed of plastic materials.

In some embodiments, the housing can further include a central slot spaced apart from the elongated slot and a pair of brackets positioned on opposite sides of the central slot. Additionally, in some embodiments, the orthopaedic surgical instrument may include a distal plate coupled to the housing, the distal plate including a bone engaging surface and an opening defined in the bone engaging surface and aligned with the central slot; an elongated shaft extending from a first end positioned in the central slot; and a pair of pivot pins coupled to the elongated shaft, each pivot pin positioned in one of the pair of brackets. The intramedullary rod can extend through the elongate shaft and an opening defined in the distal plate and define a longitudinal axis extending transverse to the bone engaging surface of the distal plate. The bone engaging surface can extend generally parallel to the cutting slot of the cutting block, and the pivot pin can cooperate to define a pivot axis about which the elongate shaft and the intramedullary rod are configured to pivot relative to the distal plate to vary the magnitude of an angle defined between the longitudinal axis and the bone engaging surface of the distal plate. In some embodiments, the distal plate may engage the pivot pin to retain the pivot pin in the bracket of the housing.

According to another aspect, an orthopaedic surgical instrument includes an intramedullary rod configured to be inserted into a medullary canal of a bone of a patient and a frame coupled to the intramedullary rod. The frame includes a base plate, an elongated shaft extending outwardly from the base plate, and a first annular groove formed on an outer surface of the elongated shaft. The orthopaedic surgical instrument further includes a mounting bracket including a body positioned on one side of the base plate of the frame and a threaded rod coupled to the body and extending outwardly along a longitudinal axis from a passage defined in the elongated shaft; a cutting block coupled to the mounting bracket, the cutting block including a cutting slot sized to receive a cutting tool to guide resection of the patient's bone; and a control knob positioned over a distal end of the threaded rod of the mounting bracket. The control knob is rotatable about the longitudinal axis to adjust an adjustment distance between the cutting slot of the cutting block and the base plate of the frame. The screw extends into an aperture of the control knob defined by an inner wall of the control knob, and the screw engages a threaded hub within the aperture to couple the mounting bracket to the control knob. A second annular rib is formed on an inner wall of the control knob that engages the first annular groove of the frame to secure the control knob and the mounting bracket to the frame.

In some embodiments, the control knob may include a plurality of visual indicators corresponding to a plurality of different adjustment distances between the cutting slot of the cutting block and the body of the mounting bracket, and the frame may include an alignment guide configured to align with a first visual indicator of the plurality of visual indicators of the control knob to index the control knob to the first adjustment distance.

In some embodiments, the first tab can extend outwardly from a hub of the control knob. The frame may include a second tab configured to engage the first tab at a first rotational position of the control knob and at a second rotational position of the control knob. An angle may be defined between the first rotational position and the second rotational position. In such embodiments, the angle defines a maximum rotation of the control knob about the longitudinal axis.

In some embodiments, the frame can include an inner wall defining a passageway and a plurality of ribs formed on the inner wall, the mounting bracket can include an elongated body extending outwardly from the main body to a distal end, and the screw extends outwardly from the distal end to a distal tip thereof, and the elongated body can include a pair of flat surfaces that engage the plurality of ribs to prevent rotation of the mounting bracket about the longitudinal axis.

In some embodiments, the orthopaedic surgical instrument may further include an outer housing coupled to the intramedullary rod. The housing may include a pair of arms spaced apart to define an elongate slot, and each arm may include a first longitudinal rib formed on a proximal surface and a second longitudinal rib formed on a distal surface located opposite the proximal surface. The frame may be configured to slide along the pair of arms. In such embodiments, the frame may include a first body including a central portion positioned in the elongated slot of the housing and a pair of first flanges extending outwardly from the central portion. Each first flange may include a proximal surface that engages the first longitudinal rib of one of the pair of arms. The frame may also include a second body coupled to the first body. The second body may include a base, an elongated shaft, and a pair of second flanges extending from the base transverse to the elongated shaft. Each second flange may include a distal surface that engages the second longitudinal rib of one of the pair of arms to couple the first body and the second body to the housing. The elongate shaft of the second body may extend outwardly from the base plate through a central portion of the first body.

Drawings

The detailed description refers specifically to the accompanying drawings in which:

FIG. 1 is a perspective view of an orthopaedic surgical instrument;

FIG. 2 is an exploded perspective view of the orthopaedic surgical instrument of FIG. 1;

FIG. 3 is another exploded perspective view taken from another angle of the orthopaedic surgical instrument of FIG. 1;

FIG. 4 is an exploded perspective view of components of the translation mechanism of the orthopaedic surgical instrument of FIG. 1;

FIGS. 4A-B are perspective views of a housing of the orthopaedic surgical instrument of FIG. 1;

FIG. 5 is a perspective view of the assembled components of FIG. 4;

FIG. 6 is an exploded perspective view of components of the height adjustment mechanism of the orthopaedic surgical instrument of FIG. 1;

FIG. 7 is a perspective view of components of a height adjustment mechanism of the orthopaedic surgical instrument of FIG. 1;

FIG. 7A is another perspective view of the component of FIG. 7;

FIG. 7B is a proximal perspective view of the components of FIG. 7;

FIG. 8 is a perspective view of a control knob of the height adjustment mechanism of the orthopaedic surgical instrument of FIG. 1;

FIG. 8A is another perspective view of the control knob of FIG. 8;

FIG. 9 is an exploded perspective view of components of the varus/valgus adjustment mechanism of the orthopaedic surgical instrument of FIG. 1;

FIG. 10 is a perspective view of the assembled components of FIG. 9;

fig. 11 is a cross-sectional elevation view taken along line 11-11 of fig. 10.

12-15 are perspective views of the orthopaedic surgical instrument of FIG. 1 at various stages of assembly;

FIG. 16 is a rear elevational view of the orthopaedic surgical instrument of FIG. 1; and is

Fig. 17 is a perspective view of the orthopaedic surgical instrument of fig. 1 positioned relative to the distal end of a patient's femur.