BLADE-LIKE SHAFT OF A HIP JOINT PROSTHESIS

A blade-like stem of a hip joint prosthesis for anchoring in the femur, including a prosthesis neck portion and a femur-anchoring portion extending therefrom and having a proximal end and a distal end, the femur-anchoring portion including a proximal arcuate portion extending from a location adjacent the proximal end and having a radius of curvature that changes in a distal-to-proximal direction, and the femur-anchoring portion further including a distal tapered portion extending from the proximal arcuate portion toward the distal end. 1. A hip joint prosthesis stem for anchoring in a femur , comprising:a prosthesis neck portion; and a proximal arcuate portion extending from a location adjacent the proximal end and having a radius of curvature that changes in a distal-to-proximal direction; and', 'a distal tapered portion extending from the proximal arcuate portion toward the distal end., 'a femur-anchoring portion extending from the prosthesis neck portion and having a proximal end and a distal end, and including2. The hip joint prosthesis stem of claim 1 , wherein the proximal arcuate portion extends along a tractrix curvature.3. The hip joint prosthesis stem of claim 1 , wherein the radius of curvature of the proximal arcuate portion becomes increasingly smaller in the distal-to-proximal direction.4. The hip joint prosthesis stem of claim 1 , wherein the radius of curvature of the proximal arcuate portion continuously changes in the distal-to-proximal direction.5. The hip joint prosthesis stem of claim 4 , wherein the radius of curvature of the proximal arcuate portion continuously decreases in the distal-to-proximal direction.6. The hip joint prosthesis stem of claim 1 , wherein the proximal arcuate portion comprises a changing radius of curvature between 200 mm and 500 mm.7. The hip joint prosthesis stem of claim 1 , wherein the femur-anchoring portion has a total length extending from the proximal end to the distal end; andwherein the proximal arcuate portion ...

Improved hip-joint prosthesis

A method of optimizing the geometry of a femoral stem (20) of a hip joint prosthesis is disclosed. The femoral stem (20) comprises a neck (21) and an anchoring blade (29) that is attached to the neck (21) and that tapers towards a distal end (23) with a lateral narrow side (28) comprising a distal straight portion (33) and a proximal arcuate portion (32) corresponding to a curve. The transition between the distal straight portion (33) and the proximal arcuate portion (32) occurs at an outer lateral point (29). The method comprises a means of optimizing the profile of the curve of said proximal arcuate portion (32) by a process of iterative modeling steps using a series of curves each defined by a path traced by the outer lateral point (29) on withdrawal of a profile of the stem (20) from a cavity (35) of complementary shape to the stem (20). Preferably, during withdrawal of the profile of the stem (20) from the cavity (35) contact between lateral-distal (36) and proximal-medial (37) stem ...

Blade-like stem of a hip-joint prosthesis

A blade-like stem of a hip joint prosthesis for anchoring in the femur, including a portion comprising a prosthesis neck on the one hand and a femur-anchoring portion tapering towards a distal end on the other hand, the lateral narrow side of which comprises a distal straight portion and a proximal arcuate portion, the straight portion extending over a length of from 60% to 75% of the total length of the stem.

ADJUSTABLE DRILL GUIDE AND METHODS OF USE THEREOF

Drill guide assemblies are adjustable for proper alignment of drill holes in the glenoid with the drill holes in the coracoid during a Latarjet procedure. The drill guide has an aimer arm extending from the body of the drill guide which has a fixed angle with respect to a drill sleeve inserted through the guide. The aimer arm can move up or down relative to the drill sleeve while maintaining the fixed angle relative to the drill sleeve by actuation of a translation member on the body. 1. A drill guide assembly , comprising:an elongate body including a proximal end, a distal end and a longitudinal axis extending between the proximal and distal ends;at least one channel extending along the longitudinal axis of the body from the proximal end to the distal end;a sleeve slidably disposed within the at least one channel, a distal end of the sleeve configured to be secured to a first surface of a bone;an aimer arm extending distally from the body, a distal end of the aimer arm configured to be secured to a second surface of the bone, the aimer arm extending at a fixed angle with respect to the sleeve;wherein a vertical distance between the aimer arm and the sleeve is adjustable to a pre-selected distance by actuation of a translation member on the body such that the aimer arm maintains the fixed angle with respect to the sleeve.2. The assembly of claim 1 , further comprising a handle extending from a lower surface of the body configured to be held by a user.3. The assembly of claim 1 , wherein the preselected distance is between 6 mm and 9 mm.4. The assembly of claim 1 , wherein the at least one channel is two channels extending on opposing sides of the aimer arm claim 1 , and wherein a distance between the two channels is about 10 mm.5. The assembly of claim 1 , wherein the sleeve comprises a bore extending from a proximal end to a distal end of the sleeve for the passage of a drill.6. The assembly of claim 1 , further comprising a locking mechanism for locking the sleeve ...

Adjustable drill guide and methods of use thereof

Drill guide assemblies are adjustable for proper alignment of drill holes in the glenoid with the drill holes in the coracoid during a Latarjet procedure. The drill guide has an aimer arm extending from the body of the drill guide which has a fixed angle with respect to a drill sleeve inserted through the guide. The aimer arm can move up or down relative to the drill sleeve while maintaining the fixed angle relative to the drill sleeve by actuation of a translation member on the body.

Blade-like shaft of a hip-joint prosthesis

Blade-like shaft (10) of a hip-joint prosthesis for anchoring in the femur, with, on the one hand, a portion (19) that comprises a prosthesis neck (18), and with, on the other hand, a femoral anchoring portion (21) which narrows towards a distal end (20) and whose lateral narrow side (22) includes a distal rectilinear portion (23) and a proximal curved portion (11), wherein the rectilinear portion (23) extends along a length (LD) of 60% to 75% of the total length (LG) of the shaft (10).

Hip-joint prosthesis

A method of optimizing the geometry of a femoral stem of a hip joint prosthesis is disclosed. The femoral stem comprises a neck and an anchoring blade that is attached to the neck and that tapers towards a distal end with a lateral narrow side comprising a distal straight portion and a proximal arcuate portion corresponding to a curve. The transition between the distal straight portion and the proximal arcuate portion occurs at an outer lateral point. The method comprises a means of optimizing the profile of the curve of said proximal arcuate portion by a process of iterative modeling steps using a series of curves each defined by a path traced by the outer lateral point on withdrawal of a profile of the stem from a cavity of complementary shape to the stem. Preferably, during withdrawal of the profile of the stem from the cavity contact between lateral-distal and proximal-medial stem contours and respective associated boundaries of the cavity are maintained. A femoral stem of a hip joint prosthesis produced by this method and a hip joint prosthesis system for use in the implantation of said femoral stem into a femur are also disclosed.

Blattartiger schaft einer hüftgelenkprothese

セメントで固定された人工器官のためのキット・システム

(57)【要約】 【課題】確実な結合を中間プレート及び骨セメントの間 に形成するキット・システムを提供すること。 【解決手段】セメントで固定された人工器官、特に膝人 工器官のためのキット・システムであって、人工器官ジ ョイント・パーツ（１）を部分的に切除した骨（２）に 対して骨セメントで固定し得るキット・システムを提供 する。キット・システムは硬化した骨セメントから予め 形成された少なくとも１つの平面スペーサ（３）を有す る。平面スペーサ（３）は人工器官パーツ（１）及び骨 （２）の間の距離を増大させるべく同スペーサ（３）の 平面（４，５）を介して骨（２）及び人工器官パーツ （１）に対してそれぞれ骨セメントで固定し得る。