CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This U.S. non-provisional patent application claims the benefit of and/or priority under 35 U.S.C. §119(e) to U.S. provisional patent application Ser. No. 62/013,218 filed Jun. 17, 2014 titled “Compression Screw System for Stabilizing and Compressing Bones of the Extremities,” the entire contents of which is specifically incorporated herein by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    The present invention relates to implants for fixation of human bones, and particularly to implants for fixation of bones of the extremities. More particularly, the present invention relates to compression screws for stabilizing and compressing bones of the extremities. 
         [0004]    2. Background 
         [0005]    Compression screws, both headless and headed, are routinely used for fixing or mending bones of the body. Particularly, and without being exhaustive, compression screws of various lengths are used for fixation of intra-articular and extra-articular fractures, avulsions, non-unions, arthrodesis, osteotomies, and reconstruction of the bones. A fundamental feature of compression screws is the amount of compression the screw achieves. Typically, the greater the compression the better the bone or bones will strongly mend. 
         [0006]    While compression screws perform their function of compression, they do not of themselves provide compression and stabilization of the bone or bones. Therefore, either several compression screws are used or a plate or other device is used in conjunction with the compression screw(s). However, the greater number of components, the greater chance for problems. 
         [0007]    In view of the above, it would be desirable to have a compression screw system for bones of the extremities that overcomes the deficiencies of the prior art. More particularly, it would be desirable to have a compression screw system that provides compression and stability to bones of the extremities. 
       SUMMARY OF THE INVENTION 
       [0008]    The present invention is a compression screw system and method of use for stabilizing and compressing bones of the extremities. The compression screw system is characterized by a compression screw component and a hook component. The hook component is received on the compression screw component in any rotational position relative to the compression screw component in order to orient the hook component relative to a bone or bones requiring compression. The hook component includes a plurality of teeth on its distal side that provide an anti-rotation feature once the hook component is driven into the bone by the compression screw component, and a configured flange providing a hook that extends about and overhangs a part of the bone. 
         [0009]    The head of the compression screw component and the hook component may include cooperating structures that allow the hook component to attach to the compression screw component. In one form, the cooperating structure of the head of the compression screw component comprises an undercut groove, while the cooperating structure of the hook component includes a rib that will ‘snap’ into the undercut groove of the compression screw component head. 
         [0010]    The head of the compression screw component may have cooperating structures that allow the compression screw component to self-orientate with respect to the hook component upon compressing engagement of the compression screw head with the hook component. 
         [0011]    The configured flange of the hook component may terminate with a single, double or multiple tined prong. The end of the prong(s)/tines may be blunt or pointed. 
         [0012]    In all forms, the compression screw component may have a longitudinal bore that extends from the head of the compression screw component through and to its tip. 
         [0013]    The present compression screw systems are configured such that they provide compression in the extremities as an intra-medullary and as an extra-medullary device. The compression screw component alone may be used as a compression screw for intra-medullary use, while the compression screw component and the hook component together are utilized for compression and stabilization for extra-medullary use. 
         [0014]    The present compression screw systems thus provide the ability to stabilize and compress factures or the like at various positions with positioning of the hook component and insertion of the compression screw component. Various sizes of the hook component can be placed on various sizes of compression screw components depending on the specific anatomy presented. 
         [0015]    Further aspects of the present invention will become apparent from consideration of the drawings and the following description of preferred forms of the invention. A person skilled in the art will realize that other forms of the invention are possible and that the details of the invention can be modified in a number of respects without departing from the inventive concept. The following drawings and description are to be regarded as illustrative in nature and not restrictive. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0016]    The features of the invention will be better understood by reference to the accompanying drawings which illustrate forms of the invention, wherein: 
           [0017]      FIG. 1  is an isometric view of a compression screw system for bones of the extremities fashioned in accordance with the principles of the present invention; 
           [0018]      FIG. 2  is a top isometric view of the compression screw system of  FIG. 1 ; 
           [0019]      FIG. 3  is an isometric side view of the two components of the compression screw system of  FIG. 1 ; 
           [0020]      FIG. 4  is an enlarged portion of the two components of the compression screw system as shown in  FIG. 3 ; 
           [0021]      FIG. 5  is an isometric view of the compression screw system of  FIG. 1  wherein the hook component is being received by the compression screw component; 
           [0022]      FIG. 6  is an enlarged side sectional view of the compression screw component of the compression screw system of  FIG. 1 ; 
           [0023]      FIG. 7  is an enlarged portion of a sectional view of the head of the hook component of the compression screw system of  FIG. 1 ; 
           [0024]      FIG. 8  is an isometric view of a compression screw system for bones of the extremities fashioned in accordance with the principles of the present invention; 
           [0025]      FIG. 9  is another isometric view of the compression screw system of  FIG. 8 ; 
           [0026]      FIG. 10  is an exploded isometric view of the compression screw system of  FIG. 8 ; 
           [0027]      FIG. 11  is an enlarged isometric view of the hook component of the compression screw system of  FIG. 8 ; 
           [0028]      FIG. 12  is another enlarged isometric view of the hook component of the compression screw system of  FIG. 8 ; 
           [0029]      FIG. 13  is an enlarged side view of the hook component of the compression screw system of  FIG. 8 ; 
           [0030]      FIG. 14  is another enlarged side view of the hook component of the compression screw system of  FIG. 8 ; 
           [0031]      FIG. 15  is an enlarged front view of the hook component of the compression screw system of  FIG. 8 ; 
           [0032]      FIG. 16  is an enlarged top view of the hook component of the compression screw system of  FIG. 8 ; 
           [0033]      FIG. 17  is an isometric view of a compression screw system for bones of the extremities fashioned in accordance with the principles of the present invention; 
           [0034]      FIG. 18  is another isometric view of the compression screw system of  FIG. 17 ; 
           [0035]      FIG. 19  is an exploded isometric view of the compression screw system of  FIG. 17 ; 
           [0036]      FIG. 20  is an enlarged isometric view of the hook component of the compression screw system of  FIG. 17 ; 
           [0037]      FIG. 21  is another enlarged isometric view of the hook component of the compression screw system of  FIG. 17 ; 
           [0038]      FIG. 22  is an enlarged side view of the hook component of the compression screw system of  FIG. 17 ; 
           [0039]      FIG. 23  is an enlarged rear view of the hook component of the compression screw system of  FIG. 17 ; 
           [0040]      FIG. 24  is an isometric view of a compression screw system for bones of the extremities fashioned in accordance with the principles of the present invention; 
           [0041]      FIG. 25  is an enlarged isometric view of the hook component of the compression screw system of  FIG. 24 ; 
           [0042]      FIG. 26  is an enlarged front view of the hook component of the compression screw system of  FIG. 24 ; 
           [0043]      FIG. 27  is a side view of bones of a left foot with the fifth metatarsal thereof having a fracture; 
           [0044]      FIG. 28  is the side view of the bones of the left foot of  FIG. 27  with a compression screw system fashioned in accordance with the present principles implanted to mend the fifth metatarsal fracture; and 
           [0045]      FIG. 29  is the side view of the bones of the left foot of  FIG. 28  with the implanted compression screw system with the fifth metatarsal in shadow. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0046]    Referring to  FIGS. 1-7 , there is depicted an implant, generally designated  10 , for compressing and/or stabilizing a bone or bones of the extremities and, particularly, a compression screw system  10  for stabilizing and/or compressing bone fractures (or the like) of the extremities at various positions. The compression screw system comprises a compression screw component  12  and a hook component  14 . The compression screw component  12  and the hook component  14  are fashioned from a known biocompatible implant material. 
         [0047]    The compression screw component  12  comprises a bone screw characterized by an elongated body, shaft or shank  13  with a middle portion  16  having a smooth outer surface, a tip  17  having external threads or threading  18 , and a head portion  15  having external threads or threading  20 . The tip  17  is slightly radially inwardly tapered while the head portion  15  is slightly radially outwardly tapered. The threads or threading  18  of the tip  17  is configured to be preferably self-tapping and of a pitch and radial size that provides good gripping of the bone into which the compression screw component  12  is received. The threads or threading  20  of the head portion  15  is sized of a pitch and radial size that provides good gripping of the bone into which the compression screw component  12  is received. 
         [0048]    A socket  21  is provided in the head portion  15  of the compression screw component  12 . The socket  21  has an inner portion  31  that that is configured to receive a working end of a compression screw driver or tool (not shown) such as is known in the art. As best seen in  FIG. 6 , the compression screw component  12  is hollow, having a longitudinal bore  19  that extends from the socket  21  of the head portion  15  to the tip  17 . Moreover, the head portion  15  has a rim  22  that extends about the socket  21 , the rim  22  being slightly radially outwardly flared on its periphery. 
         [0049]    As best seen in  FIGS. 6 and 7 , the head portion  15  (or proximate to the head portion  15 ) of the compression screw component  12 , includes structure which cooperates with structure of the hook component  14  (described in greater detail below) whereby the hook component  14  is captured by the compression screw component  12  when the hook component  14  is loaded onto the compression screw component  12  from the bottom of the compression screw component  12  (see  FIG. 5 ) or vice versa. The cooperating structure of the head portion  15  includes a groove, under cut, or the like  37  that extends radially about the head portion  15 . The groove  37  is positioned above the last threading  38  of the head portion  15  and below a radially outwardly flared bottom  33  of the rim  22 . The flared bottom  33  projects radially over the groove  37  to define an upper seating ledge  36 , both of which may be included as part of the cooperating structure of the head portion  15 . The flared bottom  33  and the upper seating ledge  36  provide a stop against further axial travel of the hook component  14  relative to the compression screw component  12  and/or vice versa, and to allow the compression screw component  12  to push against or provide compression to the hook component  14 . In this manner, driving the compression screw component  12  into the extremity bones also secures the hook component  14  at and to the desired portion of an extremity bone. 
         [0050]    The hook component  14  is characterized by a body  23  having an annular head  24  that forms an opening sized to allow the shank  13  of the compression screw component  12  to pass through the opening (see  FIG. 5 ). However, and as explained in greater detail below, the annular head  24  and its opening is sized and configured to capture the head portion  15  of the compression screw component  12 . The body  23  has a neck  40  that extends from a radial side of the annular head  24  with a transition portion  25  extending from the neck  40 . An elongated flange  26  having a generally tapered and blunt end extends downwardly from the transition portion  25  generally transverse to the neck  40 , thereby providing a hook or hook structure with the neck  40  and elongate flange  26  defining a hook area. The length of the neck  40  and the configuration of the flange  26  defines the size of the hook area. The hook may be positioned as desired along an extremity bone or bone portion to provide compression against the extremity bone or bone portion and thus stabilization. 
         [0051]    The hook component  14  also has an anti-rotation feature that provides rotational stability of the hook component  14  once the hook component  14  is driven into the bone. Particularly, a ring  28  is formed on the underside of the annular head  24  having a plurality of spikes  29  that extend downwardly from the ring  28 . While the spikes  29  are shown as triangular in shape, spikes of other shapes are contemplated. Moreover, the number and spacing of the spikes  29  may vary. 
         [0052]    Moreover, the annular head  24  of the hook component  14  has a plurality of vertical slits, cuts, or slots  27  positioned around its upper end. The vertical slits  27  help create structure of the annular head  24 /hook component  14  which cooperates with the head portion structure of the compression screw structure described above to provide a ‘snap’ fit of the annular head  24 /hook component  14  onto the compression screw head portion  15  of the compression screw component  12 . The vertical slits  27  provide flexibility to the annular head  24  by allowing it to slightly deform (e.g. expand) when radial pressure is exerted against its inside surface  41 , and because of the resilient nature of the material for the annular head  24 , allow the annular head  24  to return to its original shape when the radial pressure ceases, thereby providing the ‘snap’ fit of the hook component  14  to the compression screw component  12 . The radial pressure is provided by a rib  34  on the inside surface  41  of the annular head  24 . The annular head structure thus also includes the radially inwardly projecting rib  34 , with the rib  34  preferably, but not necessarily, forming a continuous ring around the inside surface  41  of the annular head  24 . The length or depth of the rib  34  from the inside wall  41  of the annular head  24  is such as to allow the rib  34  ‘snap fit’ into the groove  37  of the compression screw as described herein. An upper surface  35  of the rib  34  abuts the lower surface  36  of the radially outwardly flared bottom  33  of the head portion  15  of the compression screw component  14  when installed. Moreover, the inside surface  41  is preferably, but not necessarily, radially inwardly angled or tapered as shown. All these and other features are ascertainable by reference to the figures. 
         [0053]    It should be appreciated from the above, that the hook component  14  attaches over and onto a desired bone area or portion. The compression screw component  12  extends through the hook component  14  and into the bones or bone portions, providing the ability to stabilize and compress fractures at various positions. Various sizes of the hook component  14  can be placed on various sizes of the compression screw component  12  depending on the specific anatomy. 
         [0054]    Referring now to  FIGS. 8-16 , there is shown another an implant, generally designated  50 , for compressing and/or stabilizing a bone or bones of the extremities and, particularly, a compression screw system  50  for stabilizing and/or compressing bone fractures (or the like) of the extremities at various positions. The compression screw system comprises a compression screw component  52  and a hook component  54 . The compression screw component  52  and the hook component  54  are fashioned from a known biocompatible implant material. 
         [0055]    The compression screw component  52  comprises a bone screw characterized by an elongated body, shaft or shank  53  with a middle portion  56  having a smooth outer surface, a tip  57  having external threads or threading  58 , and a head  75 . The threads or threading  58  of the tip  57  is configured to be preferably self-tapping and of a pitch and radial size that provides good gripping of the bone into which the compression screw component  52  is received. A socket  71  is provided in the top  62  of the head  75  of the compression screw component  52 . The socket  71  is configured to receive a working end of a compression screw driver or tool (not shown) such as is known in the art. In the figures, the socket  71  is shown as a hexagonal socket. Other configures, however, may be used. 
         [0056]    As best seen in  FIG. 10 , the head  62  of the compression screw component  52 , includes structure which cooperates with structure of the hook component  54  (described in greater detail below) whereby the hook component  54  is engaged by the compression screw component  52  when the hook component  54  is loaded onto the compression screw component  52  from the bottom of the compression screw component  52  or vice versa. The cooperating structure of the head  75  comprises a rounded or curved underside  76  that extends from the top  62  of the head  75  to the top of the shank  53 . In this form, unlike the compression screw system  10 , the top of the shank  53  does not include threads or threading. The rounded underside  76  is configured to be received by the hook component  54  and to allow the compression screw component  52  to push against, engage, or provide compression to the hook component  54 . In this manner, driving the compression screw component  52  into the extremity bones also secures the hook component  54  at and to the desired portion of an extremity bone. 
         [0057]    The hook component  54  is characterized by a body  63  having an annular head  64  that forms an opening  73  sized to allow the shank  53  of the compression screw component  52  to pass through the opening  73  (see  FIG. 10 ). The annular head  64  and its opening  73  is sized and configured to capture the head  75  of the compression screw component  52 . The body  63  has a neck  70  that extends from a radial side of the annular head  64  with a transition portion  65  extending from the neck  70 . An elongated flange  66  having a generally blunt end extends downwardly from the transition portion  65  generally transverse to the neck  70 , thereby providing a hook or hook structure with the neck  70  and elongate flange  66  defining a hook area. The flange  66  may have a concavity  67  on its inside surface. The length of the neck  70  and the configuration of the flange  66  defines the size of the hook area. The size of the end of the flange  66  provides various amounts of bone contact. The size of the flange  66  of the compression screw system  50  is larger than the size of the flange  26  of the compression screw system  10 . The hook may be positioned as desired along an extremity bone or bone portion to provide compression against the extremity bone or bone portion and thus stabilization. 
         [0058]    The head  64  of the body  63  of the hook component  54  preferably, but not necessarily, has a beveled upper end or top  78 . The opening  73  has a beveled surface  74  that is complementary to the curved underside  76  of the head  75  of the compression screw component  52  to allow the head  75  to engage the hook component  54  in a ball and socket relationship. The beveled surface  74  is this sized to capture the head  75  of the compression screw  53 . 
         [0059]    The hook component  54  also has an anti-rotation feature that provides rotational stability of the hook component  54  once the hook component  54  is driven into the bone. Particularly, a ring  68  is formed on the underside of the annular head  64  having a plurality of spikes  69  that extend downwardly from the ring  68 . While the spikes  69  are shown as triangular in shape, spikes of other shapes are contemplated. Moreover, the number and spacing of the spikes  69  may vary. 
         [0060]    Referring now to  FIGS. 17-23  there is shown another an implant, generally designated  90 , for compressing and/or stabilizing a bone or bones of the extremities and, particularly, a compression screw system  90  for stabilizing and/or compressing bone fractures (or the like) of the extremities at various positions. The compression screw system comprises a compression screw component  92  and a hook component  94 . The compression screw component  92  and the hook component  94  are fashioned from a known biocompatible implant material. 
         [0061]    The compression screw component  92  comprises a bone screw characterized by an elongated body, shaft or shank  93  with a middle portion  96  having a smooth outer surface, a tip  97  having external threads or threading  98 , and a head  115 . The threads or threading  98  of the tip  97  is configured to be preferably self-tapping and of a pitch and radial size that provides good gripping of the bone into which the compression screw component  92  is received. A socket  111  is provided in the top  102  of the head  115  of the compression screw component  92 . The socket  111  is configured to receive a working end of a compression screw driver or tool (not shown) such as is known in the art. In the figures, the socket  111  is shown as a hexagonal socket. Other configures, however, may be used. 
         [0062]    As best seen in  FIG. 19 , the head  115  of the compression screw component  92 , includes structure which cooperates with structure of the hook component  94  (described in greater detail below) whereby the hook component  94  is engaged by the compression screw component  92  when the hook component  94  is loaded onto the compression screw component  92  from the bottom of the compression screw component  92  or vice versa. The cooperating structure of the head  115  comprises a rounded or curved underside  116  that extends from the top  102  of the head  115  to the top of the shank  93 . In this form, unlike the compression screw system  90 , the top of the shank  93  does not include threads or threading. The rounded underside  116  is configured to be received by the hook component  94  and to allow the compression screw component  92  to push against, engage, or provide compression to the hook component  94 . In this manner, driving the compression screw component  92  into the extremity bones also secures the hook component  94  at and to the desired portion of an extremity bone. 
         [0063]    The hook component  94  is characterized by a body  103  having an annular head  104  that forms an opening  113  sized to allow the shank  93  of the compression screw component  92  to pass through the opening  113  (see  FIG. 19 ). The annular head  104  and its opening  113  is sized and configured to capture the head  115  of the compression screw component  92 . The body  93  has a neck  110  that extends from a radial side of the annular head  94  with a transition portion  105  extending from the neck  110 . An elongated flange/flange structure  95  having a bifurcated end of two pointed tines  99   a ,  99   b  that extend downwardly from the transition portion  105  generally transverse to the neck  110 , thereby providing a hook or hook structure with the neck  110  and elongate flange  95  defining a hook area. The length of the neck  110  and the configuration of the flange  95  defines the size of the hook area. The size of the end of the flange  95  provides various amounts of bone contact. The hook may be positioned as desired along an extremity bone or bone portion to provide compression against the extremity bone or bone portion and thus stabilization. 
         [0064]    The head  104  of the body  103  of the hook component  94  preferably, but not necessarily, has a beveled upper end or top  118 . The opening  113  has a beveled surface  114  that is complementary to the curved underside  116  of the head  115  of the compression screw component  92  to allow the head  115  to engage the hook component  94  in a ball and socket relationship. The beveled surface  114  is this sized to capture the head  115  of the compression screw  93 . 
         [0065]    The hook component  94  also has an anti-rotation feature that provides rotational stability of the hook component  94  once the hook component  94  is driven into the bone. Particularly, a ring  108  is formed on the underside of the annular head  104  having a plurality of spikes  109  that extend downwardly from the ring  108 . While the spikes  109  are shown as triangular in shape, spikes of other shapes are contemplated. Moreover, the number and spacing of the spikes  109  may vary. 
         [0066]    As best seen in  FIGS. 21 and 23 , the two tines  99   a ,  99   b  define a cavity  120  therebetween. 
         [0067]    Referring now to  FIGS. 24-26 , there is shown another an implant, generally designated  130 , for compressing and/or stabilizing a bone or bones of the extremities and, particularly, a compression screw system  130  for stabilizing and/or compressing bone fractures (or the like) of the extremities at various positions. The compression screw system comprises a compression screw component  132  and a hook component  134 . The compression screw component  132  and the hook component  134  are fashioned from a known biocompatible implant material. 
         [0068]    The compression screw component  132  comprises a bone screw characterized by an elongated body, shaft or shank  133  with a middle portion  136  having a smooth outer surface, a tip  137  having external threads or threading  138 , and a head  142 . The threads or threading  138  of the tip  137  is configured to be preferably self-tapping and of a pitch and radial size that provides good gripping of the bone into which the compression screw component  132  is received. A socket  151  is provided in the top of the head  142  of the compression screw component  132 . The socket  151  is configured to receive a working end of a compression screw driver or tool (not shown) such as is known in the art in order to install the compression screw component  132  and the hook component  134  (i.e. to implant the compression screw system  130 ). In the figures, the socket  151  is shown as a hexagonal socket. Other configures, however, may be used. 
         [0069]    While not shown, in like manner to the head  115  of the compression screw component  92  (see e.g.  FIG. 19 ), the head  142  of the compression screw component  132  includes structure which cooperates with structure of the hook component  134  whereby the hook component  134  is engaged by the compression screw component  132  when the hook component  134  is loaded onto the compression screw component  132  from the bottom of the compression screw component  132  or vice versa. The cooperating structure of the head  142  comprises a rounded or curved underside (not seen in the figures) that extends from the top of the head  142  to the top of the shank  133 . In this form, unlike the compression screw system  10  (see e.g.  FIG. 1 ), the top of the shank  133  does not include threads or threading. The rounded underside of the head  142  is configured to be received by the hook component  134  and to allow the compression screw component  132  to push against, engage, or provide compression to the hook component  134 . In this manner, driving the compression screw component  132  into the extremity bones also secures the hook component  134  at and to the desired portion of an extremity bone. 
         [0070]    The hook component  134  is characterized by a body  143  having the generally annular head  144  that has an opening  153  sized to allow the shank  133  of the compression screw component  132  to pass through the opening  153 . The head  144  and its opening  153  are sized and configured to capture the head  142  of the compression screw component  132 . The body  143  has a neck  150  that extends from a radial side of the annular head  144  with a transition portion  145  extending from the neck  150 . An elongated flange  135  having a pointed end extends downwardly from the transition portion  145  generally transverse to the neck  150 , thereby providing a hook or hook structure with the neck  150  and elongate flange  135  defining a hook area. The flange  135  is generally smooth on its inside surface, but may be textured or otherwise configured to enhance contact between the flange  135  and bone. The length of the neck  150  and the configuration of the flange  135  defines the size of the hook area. The hook may be positioned as desired along an extremity bone or bone portion to provide compression against the extremity bone or bone portion and thus stabilization. 
         [0071]    The head  144  of the body  153  of the hook component  134  preferably, but not necessarily, has a beveled upper end or top  146 . The opening  153  has a beveled surface  154  that is complementary to the curved underside of the head  142  of the compression screw component  132  to allow the head  142  to engage the hook component  134  in a ball and socket relationship. The beveled surface  154  is this sized to capture the head  142  of the compression screw  133 . 
         [0072]    The hook component  134  also has an anti-rotation feature that provides rotational stability of the hook component  134  once the hook component  134  is driven into the bone. Particularly, a ring  148  is formed on the underside of the annular head  144  having a plurality of spikes  149  that extend downwardly from the ring  148 . While the spikes  149  are shown as triangular in shape, spikes of other shapes are contemplated. Moreover, the number and spacing of the spikes  149  may vary. 
         [0073]    It should be appreciated from the above, that the hook component  134  attaches over and onto a desired bone, bones, bone area or portion(s). The compression screw component  132  extends through the hook component  134  and into the bone, bones, bone area or portion(s), providing the ability to stabilize and compress fractures at various positions. Various sizes of the hook component  134  can be placed on various sizes of the compression screw component  132  depending on the specific anatomy. 
         [0074]      FIG. 27  shows the bones of a left human foot  160  wherein the fifth metatarsal  162  has a fracture or break F thus dividing the fifth metatarsal  162  into two bone portions  163  and  164 .  FIG. 28  shows the bones of the left foot  160  of  FIG. 27  wherein the bone compression screw system  90  has been implanted through the bone portions  164  and  163  in order to compress and stabilize the two bone portions  164 ,  163 .  FIG. 29  shows the bones of the left foot with the implanted compression screw system  90  of  FIG. 28  with the fifth metatarsal  162  shown in ghost in order to see the entire compression screw system  90  as implanted. 
         [0075]    It should be appreciated that although the present bone implant system has been described in particularity with respect to foot bones, it is applicable to hand bones and those bones being very similar in anatomy. It should also be appreciated that dimensions of the compression screw systems and their components and/or features can be altered as desired.
Compression screw systems for stabilizing and/or compressing bones of the extremities, characterized by a compression screw component and a hook component. The hook component is received on the compression screw component in any rotational position relative to the compression screw component in order to orient the hook component relative to a bone or bones requiring stabilization and/or compression. The hook component includes an anti-rotation feature, while a configured flange thereof provides a hook that extends about and overhangs a part of the bone. The compression screw component and the hook component may include cooperating structures that allow the hook component to attach to the compression screw component or allow the compression screw component to self-orientate with respect to the hook component upon compressing engagement of the compression screw head with the hook component. The configured flange of the hook component may terminate with a single, double or multiple tined prong.