Exhibit (d)(1)(K)

                              ORTHOSTRATEGIES, INC.
                                 31 THE BIRCHES
                         ROSLYN ESTATES, NEW YORK 11576


                                                               December __, 2000

Stephen V. Ardia
Kenneth Granat
Thomas I. Altholz
Dr. Justin Wernick
c/o The Langer BioMechanics Group, Inc.
450 Commack Road
Deer Park, New York 11729

         Re:  Resignations and Other Actions

Gentlemen:

      Simultaneously  with the  execution and delivery  hereof  OrthoStrategies,
Inc.  ("OS"),  OrthStrategies  Acquisition  Corp.  "Purchaser"  and The Langer
Biomechanics  Group, Inc.  ("Langer" are entering into a Tender Offer Agreement
with respect to the  acquisition  of shares of common stock,  par value $.02 per
share (the "Common Stock", of Langer by Purchaser.

      1. At the request of OS and Purchaser, and as a condition to the execution
and delivery of the Tender Offer Agreement by OS and Purchaser, each of the four
individuals addressed above (hereafter "Directors") hereby agrees to resign from
the Board of  Directors  of Langer,  effective  upon the  purchase of at least a
majority of the outstanding shares of Common Stock by Purchaser or its permitted
assignees  pursuant to the Offer  contemplated  by the Tender Offer Agreement or
the  acquisition,  by  Purchaser  or its  permitted  assignees,  pursuant to the
Shareholders  Agreement  being executed and delivered by, among others,  each of
the Directors, OS, Purchaser and Langer (the "Shareholders  Agreement",  of the
outstanding  shares of Common  Stock  owned by each of you and your  affiliates;
provided, however, that Purchaser has designated Andrew H. Meyers and/or another
director who shall be reasonably acceptable to the Board and is willing to serve
as a Director.  As a further  condition  to the  execution  and  delivery of the
Tender Offer Agreement by OS, subject to the Directors' fiduciary obligations as
directors of Langer,  each of the Directors  further agrees to take such actions
reasonably available to each of the Directors to elect to the Board of Directors
of Langer,  effective  upon  purchase of at least a majority of the  outstanding
shares of Common Stock by Purchaser or its permitted  assignees  pursuant to the
Offer or the purchase of the outstanding shares of Common Stock owned by each of
the  Directors  and  the  Directors'  affiliates  pursuant  to the  Shareholders
Agreement,  Andrew Meyers and four additional  designees of Purchaser reasonably
acceptable to the Board of Langer.



      2. Langer  hereby  agrees,  and each of OS and  Purchaser  hereby  agrees,
effective  upon  purchase  of at least a majority of the  outstanding  shares of
Common Stock by Purchaser or its  permitted  assignees  pursuant to the Offer or
the  purchase  of the  outstanding  shares of Common  Stock owned by each of the
Directors and the Directors' affiliates pursuant to the Shareholders  Agreement,
to take such actions reasonably available to OS and Purchaser,  to cause Langer,
to maintain its existing  officers' and  directors'  liability  insurance  (AD&O
Insurance" for a period of three years;  provided,  however that (x) Langer may
substitute  therefor  policies (which may be "tail"  policies)  containing terms
with respect to coverage and amount no less favorable in any material respect to
such directors and officers,  and (y) if the existing D&O Insurance expires,  is
terminated  or  canceled  during  such  three-year   period,   Langer  will  use
commercially reasonable efforts to obtain similar D&O Insurance.

      3. This letter shall be governed by and construed in  accordance  with the
laws of the  State of New York  (without  giving  effect  to the  principles  of
conflicts of law).  Each of the parties  agrees that the federal or state courts
located in the State of New York shall have exclusive jurisdiction in connection
with any dispute arising out of this letter.

      4. If any  provision  of this  letter,  or any  part  of any of  them,  is
hereafter  construed or  adjudicated  to be invalid or  unenforceable,  the same
shall not affect the  remainder  of the  covenants  or rights or remedies  which
shall be given full effect without regard to the invalid portions.

      5. No term,  provision  or  condition  of this  letter may be  modified or
discharged  unless such  modification  or  discharge is agreed to in writing and
signed by the parties hereto.  No waiver by either party hereto of any breach by
the other party hereto of any term,  provision or condition of this letter to be
performed by such other party shall be deemed a waiver of similar or  dissimilar
provisions or conditions at the same or at any prior or subsequent time.

      6. The  agreements of OS and Purchaser  contained  herein are binding upon
each of them and their respective  successors and assigns under the Tender Offer
Agreement.


                                       2


      Please  confirm your  agreement  with the foregoing by executing a copy of
this letter in the  appropriate  space below and  returning the executed copy to
the undersigned.


                                           ORTHOSTRATEGIES, INC.


                                           By: ________________________________

                                           ORTHOSTRATEGIES ACQUISITION CORP.


                                           By: ________________________________




ACCEPTED AND AGREED AS OF
THE DATE HEREOF:


________________________________
         Stephen V. Ardia


________________________________
         Kenneth Granat


________________________________
         Thomas I. Altholz

________________________________
         Justin Wernick


THE LANGER BIOMECHANICS GROUP, INC.

By:_________________________________
          Steven V. Ardia, Chairman