Stance and weight distribution after tibial plateau leveling osteotomy in forelimb and hind limb amputee dogs

Stance Analyzer

Stance and weight distribution after tibial plateau leveling osteotomy in forelimb and hind limb amputee dogs

  • October 4 2023
  • Companion Studies

Published: Small Animal Orthopedics, Koret School of Veterinary Medicine, Rehovot, Israel. The Hebrew University of Jerusalem, P.O Box 12, 76100 Rehovot, Israel

Keyword: Dog, amputation, tibial plateau leveling, TPLO, weight distribution, stance analyzer

Author(s): Ron Ben-Amotz, David Dycus, David Levine, Andréia Gonçalves Arruda, Nicholas Fagan and Denis Marcellin-Little

Overview:  The objectives of the current study were to measure the weight distribution and posture of forelimb and hind limb amputee dogs after a TPLO (AmpTPLO), to compare those to weight distribution and posture in amputee dogs not undergoing a TPLO (Amp), and to four legged dogs after a TPLO (4LTPLO).



  • Twenty-eight dogs were enrolled in the study: Seven AmpTPLO, 10 Amp, and 11 4LTPLO.
  • All dogs had undergone either a forequarter amputation or a coxofemoral disarticulation at least eight weeks or more prior to being enrolled in the study.
  • No meniscal injuries were identified during TPLO surgery.
  • TPLO were stabilized with a bone plate and a combination of locking and nonlocking screws.
  • Craniocaudal and mediolateral stifle radiographs were acquired before surgery, immediately after surgery, and eight weeks or more after surgery.
  • Standing weight distribution was measured using the Companion Stance Analyzer.
  • Fifteen measurements of weight distribution were recorded and means were calculated for each patient.
  • Shoulder, elbow, carpus, hip, stifle, and tarsus angles were measured.


  • Dogs with a previous hind limb amputation had the largest mean increase in weight bearing in the contralateral thoracic limb.
  • The AmpTPLO increased the weight placed on their ipsilateral thoracic limb.
  • In contrast to four-legged control dogs, which bear 60% of their weight in the forelimbs and 40% in the hind limbs, dogs bear 74% of their weight on their thoracic limbs and 26% on their pelvic limbs after a hind limb amputation.
  • In the current study, AmpTPLO appear to behave similarly to those Amp with regards to thoracic limb weight distribution.

Conclusions:  The position of the center of mass and posture of AmpTPLO and Amp does not differ. The weight distribution and posture of Amp is not impacted negatively by TPLO.