Patient-specific femoral version guide

Patent metadata

Field	Value
Publication number	US-2016100845-A1
Application number	US-201514973057-A
Country	US
Kind code	A1
Filing date	Dec 17, 2015
Priority date	Mar 7, 2011
Publication date	Apr 14, 2016
Grant date	—

Abstract

An orthopedic device includes a monolithic patient-specific guide. The patient-specific guide includes a three-dimensional contact surface preoperatively configured from medical scans of a specific patient as a negative surface of a medial portion of a proximal femoral bone of the patient according to a preoperative surgical plan for the patient. The guide also includes a proximal planar surface configured for guiding a resection of a femoral neck of the patient, and a scale formed on the planar surface. The scale is configured for indicating a preoperatively planned femoral version of a femoral stem implant and deviations therefrom.

First claim

1 - 20 . (canceled)

21 . An patient-specific orthopedic guide comprising:
a three-dimensional contact surface preoperatively configured from medical scans of a specific patient as a negative surface of a lesser trochanter of a proximal femoral bone of the patient according to a preoperative surgical plan for the patient; and a planar surface configured for guiding a resection of a femoral neck of the patient, the planar surface configured to be disposed proximal of the lesser trochanter of the patient and configured to extend along less than an entirety of the femoral neck.

22 . The orthopedic device of claim 21 , further comprising a scale on the planar surface, the scale configured for indicating a preoperatively planned femoral version of a femoral stem implant and deviations therefrom.

23 . The orthopedic device of claim 22 , further comprising a version assembly including a body and a pointer element, the version assembly configured to indicate intraoperatively an actual femoral stem version on the scale of the patient specific guide when the version assembly is coupled to a fully seated broach for a femoral stem implant.

24 . The orthopedic device of claim 23 , wherein the body of the version assembly includes an internal bore configured to receive a proximal post of a broach for a femoral stem implant.

25 . The orthopedic device of claim 21 , wherein the patient-specific guide is monolithic.

26 . The orthopedic device of claim 23 , further in combination with a broach for the femoral stem.

27 . The orthopedic device of claim 26 , further comprising a trial trunnion for the broach and a trial femoral head for the trunnion.

28 . An orthopedic assembly comprising:
a patient-specific guide having a three-dimensional contact surface preoperatively configured from medical scans of a specific patient as a negative surface of a lesser trochanter of a proximal femoral bone of the patient according to a preoperative surgical plan for the patient, the patient specific guide having a proximal planar surface configured for guiding a resection of a femoral neck of the patient, the proximal planar surface configured to extend along less than an entirety of the femoral neck; a broach for a femoral stem implant, the broach having a proximal post; and a version assembly having a body with an inner bore receiving the post of the broach.

29 . The orthopedic assembly of claim 28 , wherein the patient-specific guide includes a scale on the planar surface, the scale is configured for indicating a preoperatively planned femoral version of a femoral stem implant and deviations therefrom.

30 . The orthopedic assembly of claim 29 , wherein the version assembly includes a pointer element configured to be attached to the body and rotatable with the broach, the pointer element indicating on the scale a femoral version determined by the broach.

31 . The orthopedic assembly of claim 28 , further in combination with a plurality of trunnions and a plurality of trial femoral heads.

32 . A method for hip arthroplasty comprising:
mounting a patient-specific guide around a medial portion of a proximal femoral bone of a hip joint of a patient; registering a contact surface of the patient-specific guide onto the medial portion ma unique position, the contact surface preoperatively configured as a negative of the medial portion from medical scans of the patient; resecting a femoral neck of the femoral bone along a planar guiding surface of the patient-specific guide, the planar guiding surface configured to extend along less than an entirety of the femoral neck; and preparing an intramedullary canal of the femoral bone using a broach through the resected femoral neck.

33 . The method of claim 32 , further comprising:
coupling a pointer element to the broach; and indicating with the pointer element a femoral version angle on a scale of the patient-specific guide.

34 . The method of claim 33 , wherein coupling the pointer element to the broach includes inserting a proximal post of the broach into an inner bore of a version assembly, the pointer element attached to the body of the version assembly and rotatable with the broach.

35 . The method of claim 33 , wherein the scale is formed on the planar guiding surface of the patient-specific guide.

36 . The method of claim 35 , wherein the scale is calibrated for a preoperatively determined femoral version for a femoral stem implant.

37 . The method of claim 36 , wherein the pointer element indicates a degree of an actual deviation from the preoperatively determined femoral version on the scale.

38 . The method of claim 32 , further comprising:
removing the patient-specific guide after resecting the femoral neck; selecting a trunnion; coupling the trunnion to the broach, when the broach is fully seated; selecting a trial femoral head; and coupling the trial femoral head to the trunnion.

39 . The method of claim 32 , further comprising:
removing the patient-specific guide after resecting the femoral neck; and making a vertical resection of the proximal femoral bone.

40 . The method of claim 32 , wherein the negative of the medial portion includes a negative of a lesser trochanter of the proximal femoral bone.

Assignees

• Biomet Mfg Llc

Inventors

• Smith Aaron P
• Meridew Jason D

Classifications

• A61B2090/062

  penetration depth · CPC title

• A61B2090/034

  abutting on parts of the device itself · CPC title

• A61B2034/252

  indicating steps of a surgical procedure · CPC title

• A61B2034/108

  Computer aided selection or customisation of medical implants or cutting guides · CPC title

• A61B2034/105

  Modelling of the patient, e.g. for ligaments or bones · CPC title