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The High Risk of Personal Injury Trials: The Costs and Disbursements Swing


As previously discussed, personal injury trials can be risky and expensive.  The British Columbia Supreme Court has a so-called ‘loser pays’ system which generally makes the losing side pay the winning side’s costs and disbursements (the hard expenses associated with running a trial such as court filing and expert witness fees).  Last month the BC Supreme Court, Victoria Registry, released reasons for judgement demonstrating this reality.
In this recent case (Sartori v. Gates) the Plaintiff was injured in 2005 when a truck owned by his friend accidentally struck him.  The Plaintiff sued for damages.  As the lawsuit progressed ICBC made a formal settlement offer of $230,000 plus costs and disbursements.
The Plaintiff presented his own formal offer of $600,000 plus costs and disbursements.   These offers were rejected and the claim proceeded to trial.  Ultimately a jury found the Plaintiff 33.3% at fault for the collision but accepted that he was injured and awarded damages.
When all the dust settled, the Plaintiff was awarded $234,000.  ICBC argued that since the final result was “within a knife’s edge” of their offer that the Plaintiff should be stripped of his post offer costs and disbursements.  This was a significant development because the Plaintiff spent over $120,000 in disbursements while advancing his claim.
Ultimately Mr. Justice Wilson found that this result would not be fair.  However, the Court disallowed disbursements associated with one of the Plaintiff’s expert witnesses and further reduced the disbursements the Plaintiff was entitled to by 1/3 to take into account the jury’s finding of fault and section 3 of the Negligence Act.  Some quick math reveals this results in about $40,000 of the real costs of advancing the claim not being recovered by the Plaintiff.  This large swing highlights the need to consider potential costs consequences when deciding whether to settle an ICBC claim or to proceed to trial.
This recent case is also noteworthy for a few other reasons.  ICBC argued that the usual rule of a winner receiving costs should not be followed given how close the settlement offer was to the jury verdict.   Mr. Justice Wilson rejected this argument providing the following useful reasons:

[42] The governing principle on the first issue, is R. 14-1(9).  The material words of that subrule, on this application, are:

… costs of a proceeding must be awarded to the successful party unless the court otherwise orders.

[43] The onus is on the defendant to persuade me why I should otherwise order….

[55] The plaintiff reminds me that the discretion conferred by the cost rules must be exercised judicially.  The parameters of that judicial duty were referred to in Stiles v. B.C. (Workers’ Compensation Board), and iterated consistently thereafter.  The court said:

… The discretion must be exercised judicially, i.e. not arbitrarily or capriciously.  And, as I have said, it must be exercised consistently with the Rules of Court.  But it would be a sorry result if like cases were not decided in like ways with respect to costs.  So, by judicial comity, principles have developed which guide the exercise of the discretion of a judge with respect to costs.  Those principles should be consistently applied; if a judge declines to apply them, without a reason for doing so, he may be considered to have acted arbitrarily or capriciously and not judicially.

[56] The Rules of Court mentioned in that extract are those cited above.  The “principles … developed …” or “purposes”, were referred to in Giles v. Westminster Savings and Credit Union:

The purposes for which costs rules exist must be kept in mind in determining whether appellate intervention is warranted.  In addition to indemnifying a successful litigant, those purposes have been described as follows by this Court:

•     “[D]eterring frivolous actions or defences”:  Houweling Nurseries Ltd. v. Fisons Western Corp. (1988), 37 B.C.L.R. (2d) 2 at 25 (C.A.), leave ref’d, [1988] S.C.C.A. No. 200, [1988] 1 S.C.R. ix;

•     “[T]o encourage conduct that reduces the duration and expense of litigation and to discourage conduct that has the opposite effect”:  Skidmore v. Blackmore (1995), 2 B.C.L.R. (3d) 201 at para. 28 (C.A.);

•     “[E]ncouraging litigants to settle whenever possible, thus freeing up judicial resources for other cases”:  Bedwell v. McGill, 2008 BCCA 526, 86 B.C.L.R. (4th) 343 at para. 33;

•     “[T]o have a winnowing function in the litigation process” by “requir[ing] litigants to make a careful assessment of the strength or lack thereof of their cases at the commencement and throughout the course of the litigation”, and by “discourag[ing] the continuance of doubtful cases or defences”:  Catalyst Paper Corporation v. Companhia de Navegaçao Norsul, 2009 BCCA 16, 88 B.C.L.R. (4th) 17 at para. 16.

[57] Giles is also authority for the proposition that the “usual rule” is that costs follow the event…

Here, this plaintiff did succeed.  The defendant’s argument is that he did not succeed to the extent of his aspirations.  Therefore, goes the argument, the defendant should have the costs of establishing that failure.

[81] In my opinion, that proposition is not a phenomenon contemplated by R. 14?1(14) or Forrest v. Gaidner.

[82] My conclusion on the first issue is that the defendant has not persuaded me that this is a case on which I should otherwise order.  The plaintiff is entitled to his costs, subject to the disallowance of one day of trial and disbursements associated with Dr. Hunt’s involvement.

Prior Expert Reports, Cross-Examination and Notice


When a Plaintiff is cross examined in the trial of a personal injury claim can opinions from medico-legal reports from prior litigation be introduced into evidence without complying with the notice requirements set out in the Rules of Court?  Reasons for judgement were recently released by the BC Supreme Court addressing this issue.
In the recent case (Hosking v. Mahoney) the Plaintiff was injured in three separate motor vehicle collisions.  The first collision was in 2000, the second in 2001 and the third in 2004.
The Plaintiff advanced claims for compensation as a result of all three collisions.  In the course of the first two claims the Plaintiff’s physician authored a medico-legal report in 2003 addressing the extent of her injuries.  The Plaintiff settled both these claims prior to her third collision.
The claim arising from the third collision did not settle and proceeded to trial.  At trial the Defendant introduced the prior medico-legal report during cross examination.  The Court allowed this and further permitted the previous opinion to go into evidence even though the usual notice requirements for the introduction of opinion evidence were not complied with.  In permitting this evidence to be introduced Mr. Justice Warren provided the following reasons:
[171] I found the medical opinion of Dr. Gurdeep Parhar, the plaintiff’s attending physician for the first two accidents and the author of the medical/legal report of March 10, 2003, important and difficult to resolve with the evidence and submissions of the plaintiff that she had largely recovered prior to the February 2004 accident.  This evidence was entered by the defendant when cross-examining the plaintiff and was not rebutted or varied by Dr. Parhar who was not called to testify.  The court is entitled to draw an adverse inference when a witness who could provide relevant evidence on an issue before the court, is not called.  In my view the defendant was entitled to rely upon the letter and opinion of Dr. Parhar without providing the usual notice.  It was a report prepared for and at the request of the plaintiff and it was identified and portions adopted by the plaintiff in cross-examination.  The plaintiff had the opportunity to call Dr. Parhar or evidence to rebut the opinion or to object to its introduction prior to its use in cross-examination.

"Frightened" Claimant Excused From Obtaining Information From Motorist in s. 24 ICBC Claim


As previously discussed, one of the conditions to successfully sue ICBC under section 24 of the Insurance (Vehicle) Act following a hit and run collision is to take “all reasonable efforts” to ascertain the identity of the at fault motorist.  Failure to do so can be fatal to the claim.  Reasons for judgement were released this week by the BC Supreme Court, Duncan Registry, discussing this requirement.
In this week’s case (Burton v. ICBC) the Plaintiff was involved in a rear-end crash in 2008.  It was a dark and rainy night and the Plaintiff was travelling alone.  Following the collision the rear motorist “immediatley began banging on the windows (of the Plaintiff’s vehicle)…(and) yelled ‘move the car off the road, let’s get this over and done with bitch’ “.  The Plaintiff remained in her vehicle and the rear motorist then “slammed (the Plaintiff’s) door, returned to his vehicle, backed away and then passed by on her right side…and disappeared from her view”.
The Plaintiff sued ICBC for damages under section 24 of the Insurance (Vehicle) Act.  ICBC denied liability arguing that the Plaintiff had a reasonable opportunity to obtain the at fault motorists details and she failed to discharge her responsibilities under this section.  Mr. Justice Macaulay rejected ICBC’s arguments and awarded the Plaintiff damages.  In doing so the Court provided the following reasons:

[26] Section 24 and its predecessor have been judicially considered and applied many times. While the fact patterns in the cases are understandably divergent, there is little, if any, controversy in the law. In Leggett v. Insurance Corp. of British Columbia (1992), 72 B.C.L.R. (2d) 201 (B.C.C.A.), the Court of Appeal, referring to the predecessor section, set the bar fairly high for plaintiffs, stating at para. 9:

In my view the overall purpose of the section is to limit the exposure of [ICBC] to claims brought by persons who, in the matter of seeking to identify those responsible for the accident, have done everything they reasonably could to protect what ordinarily would be in their own interests, and which, by virtue of the section, become the interests of the corporation.

[31] I am persuaded that the fear and anxiety that Mrs. Burton felt in the circumstances provides a reasonable justification for her failure to ask the driver to properly identify himself or to attempt to identify the license plate. As a woman alone in a car at night, faced with aggressive threatening behaviour, her first concern was legitimately for her safety and to avoid confronting the driver.

[32] I accept that Mrs. Burton never chose, as did the plaintiff in Leggett, not to pursue her obligation. Instead, after reporting the matter to the police, she and her husband, along with friends, looked for the other vehicle. When they thought they might have found it, Mrs. Burton appropriately passed the information on to the police. At that point, it was reasonable, given the location of the vehicle on private property and the conduct of the driver at the time of the collision, that the police, rather than Mrs. Burton, take the investigative steps necessary to confirm whether the vehicle parked on Gibbons Road was involved. She is not responsible for their failure to do so.

[33] Also, Mrs. Burton’s obligation did not extend, in the circumstances, to doing more. I am not persuaded that postings or advertising for witnesses had any realistic prospect of eliciting information that would identify the other vehicle or the driver.

[34] I am satisfied that Mrs. Burton has satisfied the obligations that s. 24(1) places on her. She is entitled to judgment against ICBC as the nominal defendant.

$60,000 Non-Pecuniary Damage Assessment for STI's Imposed on Pre-Existing Injuries

Reasons for judgement were released this week dealing with damages for soft tissue injuries imposed on pre-existing symptomatic injuries.
In this recent case, (Hosking v. Mahoney), the Plaintiff was injured in a 2004 motor vehicle collision.  She had pre-existing injuries from previous collisions and as a result had some on-going symptoms.  Mr. Justice Warren found that the new injuries would likely continue well into the future and assessed non-pecuniary damages (money for pain and suffering and loss of enjoyment of life) at $80,000 then reduced this award by 25% to account for the Plaintiff’s pre-existing injuries.  In reaching this result the Court provided the following reasons:

[178] I find that the plaintiff suffered a mild to moderate soft tissue injury to her cervical and upper thoracic areas as a result of the February 2004 accident.  This was superimposed on her already symptomatic condition caused by the earlier accidents and although she had started to make the expected recovery, the process was interrupted by her falls.  Normally, these would not have affected the plaintiff but she was more vulnerable as a result of the three accidents.  There is no orthopaedic or neurological cause.  It is probable that these complaints will continue well into the future but can be managed and alleviated by an appropriate exercise programme (as recommended by her medical advisors as early as Dr. Parhar in March 2003) and by such passive therapies as may, from time to time, help alleviate her symptoms.

[179] Using the authorities relied upon by counsel as a template, for each case depends on its own unique features, I assess the plaintiff’s general damages at $80,000 which I reduce by 25% as attributable to or an apportionment for her pre-existing symptomatic injuries and her intervening falls.

Court Finds Plaintiffs Can Face Costs Risks If Defendant Succeeds in Contributory Negligence Claim


Reasons for judgement were released last week by the BC Supreme Court finding that Rule 14-1(15) provides the court with discretion to award costs to a Defendant following a finding of contributory negligence as against a Plaintiff.
In last week’s case (Brooks-Martin v. Martin) the Plaintiff was involved in a motorcycle collision.  At trial she was found 30% at fault with the Defendant bearing 70% of the blame.  The Court awarded the Plaintiff 70% of her costs in accordance with the BC Negligence Act.  Although not specifically asked to address this issue, the Court went further and found that the Rules of Court permit a costs award to be made against a Plaintiff if they are found contributorily negligent.  Mr. Justice Halfyard provided the following reasons:

[41] Section 3 of the Negligence Act directs that the plaintiff shall receive 70% of her costs of this proceeding, from the defendant Martin. But that statute does not entitle the defendant Martin to receive 30% of his costs of the proceeding, from the plaintiff, because he sustained no damage or loss. See Bedwell v. McGill 2008 BCCA 526 at paras. 29-30 and 32.

[42] However, the defendant Martin was successful on the issue of contributory negligence on the part of the plaintiff. In my opinion, the costs entitlement of the plaintiff is defined solely by theNegligence Act. That statute directs that the plaintiff shall recover 70% of her costs of the proceeding from the defendant Martin. It seems to me that the Rules of Court relating to costs should govern the issue of whether the defendant Martin should recover any of his costs from the plaintiff. Rule 14-1(15) reads in part:

(15)      The court may award costs

. . .

(b)        that relate to some particular application, step or matter in or related to the proceeding . . .

[44] I think that the issue of whether the plaintiff was contributorily negligent is a “matter in or related to the proceeding” under the new rule… I conclude that the court has the discretion to award costs of the contributory negligence issue, to the defendant Martin. I am not suggesting that such costs should be awarded, only that the court has jurisdiction to entertain such an application under the Rules of Court.

Can Pleadings Be Amended After Trial?


Once a Notice of Trial has been served or a Case Planning Conference is held a party can only amend their pleadings with permission of all other parties or with leave of the Court.  The Court can allow an amendment of pleadings under Rule 6-1 during (or even after) trial as was demonstrated in reasons for judgement released this week by the BC Supreme Court, Vancouver Registry.
In this week’s case (0679372 B.C. Ltd. v. The Winking Judge Pub Ltd.) the Plaintiff’s claim proceeded to trial and was successful.  Following trial, but prior to entry of a formal order, the Plaintiff brought an applicaiton to amend it’s pleadings “to conform with the evidence at trial, and to conform with the Reasons for Judgement delivered“.
Madam Justice Smith granted the applicaiton finding this was an appropriate case to allow pleadings to be amended.  In making this finding the Court provided the following reasons:

[6] In Canadian National Railway Co. v. Imperial Oil Ltd., 2007 BCSC 1193, [2007] B.C.J. No. 1743 [C.N.R.] the following principles regarding amendments were set out at para. 18 with respect to the exercise of the Court’s discretion to permit amendments to pleadings during or at the conclusion of a trial:

(a)    the amended pleadings must not be inconsistent with the pleadings already filed on behalf of the party seeking an amendment;

(b)    the amended pleadings must not be inconsistent with the evidence tendered by that party at trial and on discovery;

(c)    the amended pleadings must be such that they would not have changed the whole course of the trial had they been requested at the outset of the trial;

(d)    the amendment must not be unfair to the opposite party; and

(e)   the amendment must be necessary for the purpose of determining the real issues raised.

[7] In my view, the plaintiff’s application for leave to amend should be granted.  It is consistent with the pleadings already filed.  It is not inconsistent with evidence tendered by the plaintiff at trial (or on discoveries, so far as I am aware).  The amended pleadings would not have changed the course of the trial.  Permitting the amendment will not be unfair to the defendants, who were well aware of the evidence and who were given the opportunity to make submissions regarding the implications of a possible express trust.  Finally, the proposed amendment is necessary to record accurately the issues raised and determined in these proceedings.

Winners and Losers: More on Costs Consequences and Formal Settlement Offers


How can a Plaintiff who is awarded damages following a personal injury trial end up owing ICBC money?  The answer relates to the costs consequences that can be triggered by formal settlement offers.  I’ve discussed this topic previously and two sets of reasons for judgement were released this week by the BC Supreme Court further demonstrating this reality.
In the first case (Dempsey v. Oh) the Plaintiff was injured in a bicycle accident when he was struck by the Defendant’s vehicle.  In the course of the lawsuit ICBC made a formal settlement offer of $40,000.  As trial neared ICBC increased their formal offer to $165,000.  The Plaintiff rejected this and proceeded to trial.  At trial the Court made some critical findings relating to the Plaintiff’s credibility and awarded damages of just over $20,000.
Following trial ICBC asked for an order pursuant to Rule 9-1(5) that the Plaintiff pay all of the Defendant’s costs following their first formal offer.  The Plaintiff objected to such a result arguing that “if he is ordered to pay the defendant’s costs he will end up owing it money“.  Mr. Justice Myers rejected this argument and ordered that the Plaintiff pay the Defendant’s post offer costs.  In rejecting the Plaintiff’s submission the Court made the following comment “It is not the court’s function to ensure that a plaintiff makes a net recovery from an action when it has ignored a reasonable offer.  That would defeat the purpose of the Rule and does not accord with common sense”.
On another note, this case is worth reviewing in full for the Court’s discussion of Rule 14-1(10).  The Defendant argued that the Plaintiff should be deprived of his pre-offer costs as there was no sufficient reason to sue in Supreme Court.   Mr. Justice Myers rejected this argument finding that when the lawsuit was started the Supreme Court was an appropriate venue.  In making this finding the Court provided the following useful reasons:
[11]    In part due to the loss of income, this was a more complicated case than Ghelen.  This action was commenced approximately six months after the accident.  At that point I find it was reasonable for the plaintiff to have commenced the action in this Court because he was reasonably entitled to see the impact of the accident on his prior condition.  There is nothing in the rules which imposes a cost penalty on a party who files its suit quickly after its cause of action arises.  And, in Reimann v. Aziz, 2007 BCCA 448, the Court of Appeal held that there is no ongoing obligation on a party to assess his action as it progresses in the Supreme Court in order to consider whether it should be moved to Provincial Court.
In the second case released this week (Miller v. Boughton) the Plaintiff was injured in a 2006 collision.  She sued for damages and her case went before a jury.  The trial lasted 7 days.  Prior to trial ICBC made a series of escalating formal settlement offers starting at $22,000 with the final offer made shortly before trial topping out at $62,500.
The Plaintiff rejected these offers and proceeded to trial.  The Jury found the Plaintiff 45% at fault for the crash and the Defendant 55% at fault.   After taking this split into account the Jury’s award was a modest $3,880.  ICBC’s motion for post offer costs and disbursements was granted.  After factoring these in the Plaintiff likely ended up owing ICBC a significant amount of money.   (UPDATE September 12, 2011 – click here for follow up reasons confirming the Defendant’s costs were assessed at over $42,000)
Cases such as these illustrate the important lesson that formal offers create a “loser pays” system which could result in significant costs swings following trial.  When considering ICBC formal settlement offers it is important to keep this in mind when deciding whether to accept the offer or proceed to trial.

More on ICBC Claims, Costs and Sufficient Reason to Sue in Supreme Court


Earlier this year the BC Court of Appeal released important reasons finding that more than value of a claim can be considered in deciding whether a Plaintiff has sufficient reason to sue in the Supreme Court when considering costs under Rule 14-1(10).   Useful reasons for judgement were released last month  by the BC Supreme Court, Vancouver Registry, further addressing this issue in the context of an ICBC Injury Claim.
In last month’s case (Taylor v. Kassa) the Plaintiff was injured in BC motor vehicle collision.  His injuries were modest and it was “readily apparent from the outset that the quantum of damages would fall within the jurisdiction of the Small Claims Court“.  Despite this he sued for damages in the Supreme Court under the fast track rule.
After examinations for discovery a damages settlement was reached for $15,000.  The parties agreed to ask the Court to address the issue of whether costs should be payable.  Mr. Justice Davies found that given ICBC’s boilerplate response to the lawsuit it was reasonable for the Plaintiff to pursue the claim in Supreme Court with the assistance of counsel therefore entitling the Plaintiff to costs.  In reaching this decision the Court provided the following reasons:
[7] ….I make that ruling because I find it to be significant that this matter did not settle until there had been examinations for discovery.
[8]  The defendants availed themselves of the discovery procedure and then revised their assessment of the case.  Prior to discoveries, there had been a complete denial of liability and causation including allegations of pre-existing injury and failure to mitigate, all of which matters had rendered the case somewhat complex.
[9]  As Justice Punnett said in Spencer at para. 23 and 24

[23] Arguably, at the time the action was started, the claim could have exceeded $25,000. The plaintiff knew her injuries, from which it took her 18 months to substantially recover, caused her pain at work, disturbed her sleep, made her unable to do housework, and decreased her leisure activities. She had missed seven days of work and required numerous visits to a chiropractor and massage therapist. There is no evidence that the plaintiff misled counsel or that her complaints lacked credibility.

[24] Further, even if it was clear that the claim would fall within the Small Claims Court’s jurisdiction, the issues raised by the defendant increased the complexity of the claim and the plaintiff’s need for counsel. By denying liability, causation and that the plaintiff suffered any loss, the plaintiff would have been required to prove these elements at trial. Also, although unnecessary because the matter settled, discovery of the defendant, which had been arranged, could have been important to the plaintiff’s case.

[10]  I am satisfied that this case falls within that same exeption expressed in para. 24 and supports a finding of sufficient reason to commence the action in this case in this Court.
[11]  Discovery was not available in the Provincial Court and led to the settlement of this case.
[12]  There will be an order that the plaintiff recover his costs under the provisions of the fast-track litigation project.
The Taylor decision is unpublished but, as always, I’m happy to provide a copy to anyone who contacts me and requests a copy.

Dark Alley Assault Occupier's Liability Lawsuit Dismissed


Reasons for judgement were released last week by the BC Supreme Court, Kelowna Registry, dealing with an interesting issue: Can a commercial occupier be sued for an intentional assault for having inadequate lighting in their alleyway.
In last week’s case (Vaughn v. Kelowna Speedometer Ltd.) the Plaintiff was a patron at the Blue Gator Bar and Grill in Kelowna, BC.  After several hours he left the pub.  As he was walking in the pub’s back alley he was “assaulted from behind and seriously injured“.  His assailant was unknown.  The Plaintiff sued the Pub alleging that the alley had poor lighting and this contributed to the assault.  Mr. Justice Shabbits dismissed the lawsuit finding that even if the lighting was inadequate for the conditions it did not cause the assault using the “but for” test.  In dismissing the claim the Court provided the following reasons:

[23] In my opinion, the plaintiff has not shown that but for proper lighting he would not have been injured. I agree with the submission that additional lighting may have reduced the risk of an assault, but lack of lighting did not cause the assault. The plaintiff could have been assaulted in daylight hours, or assaulted farther down the alley. It is speculation to infer that lighting was a factor in the assault occurring. Even assuming that the lighting at the rear of the Blue Gator was inadequate, the evidence is not capable of proving, on a balance of probabilities, that Mr. Vaughn would not have been injured had proper lighting been in place.

[24] Mr. Vaughn bears the burden of showing that “but for” the negligent act or omission, the injury would not have occurred. There is no evidence on which I would find that but for adequate lighting, the injury would not have occurred. I am of the opinion that it has not been shown, on a balance of probabilities, that a lack of lighting caused Mr. Vaughn’s loss.

Leave to Appeal In Bradley Denied; Welcome Certainty for Indivisible Injury Compensation


In an ICBC Claim decided last year the BC Court of Appeal simplified the approach for compensation for indivisible injuries caused by multiple events.  ICBC sought to overturn this decision and recently the Supreme Court of Canada refused leave (meaning they decided not to hear the case putting an end to the appeal).  For the sake of convenience here are the Court of Appeals key reasons explaining how indivisible injuries should be treated in British Columbia:

[32]        There can be no question that Athey requires joint and several liability for indivisible injuries.  Once a trial judge has concluded as a fact that an injury is indivisible, then the tortfeasors are jointly liable to the plaintiff.  They can still seek apportionment (contribution and indemnity) from each other, but absent contributory negligence, the plaintiff can claim the entire amount from any of them.

[33]        The approach to apportionment in Long v. Thiessen is therefore no longer applicable to indivisible injuries.  The reason is that Long v. Thiessen pre-supposes divisibility: Longrequires courts to take a single injury and divide it up into constituent causes or points in time, and assess damages twice; once on the day before the second tort, and once at trial.  Each defendant is responsible only for their share of the injury and the plaintiff can recover only the appropriate portion from each tortfeasor.

[34]        That approach is logically incompatible with the concept of an indivisible injury.  If an injury cannot be divided into distinct parts, then joint liability to the plaintiff cannot be apportioned either.  It is clear that tortfeasors causing or contributing to a single, indivisible injury are jointly liable to the plaintiff.  This in no way restricts the tortfeasors’ right to apportionment as between themselves under the Negligence Act, but it is a matter of indifference to the plaintiff, who may claim the entire amount from any defendant.

[35]        This is not a case of this Court overturning itself, because aspects of Long v. Thiessen were necessarily overruled by the Supreme Court of Canada’s decisions in Athey,E.D.G., and Blackwater.  Other courts have also come to this same conclusion: see Misko v. Doe, 2007 ONCA 660, 286 D.L.R. (4th) 304 at para. 17.

[36]        It may be that this represents an extension of pecuniary liability for consecutive or concurrent tortfeasors who contribute to an indivisible injury.  We do not think it can be said that the Supreme Court of Canada was unmindful of that consequence.  Moreover, apportionment legislation can potentially remedy injustice to defendants by letting them claim contribution and indemnity as against one another.

[37]        We are also unable to accept the appellant’s submission that “aggravation” and “indivisibility” are qualitatively different, and require different legal approaches.  If a trial judge finds on the facts of a particular case that subsequent tortious action has merged with prior tortious action to create an injury that is not attributable to one particular tortfeasor, then a finding of indivisibility is inevitable.  That one tort made worse what another tort created does not automatically implicate a thin or crumbling skull approach (as in Blackwater), if the injuries cannot be distinguished from one another on the facts.  Those doctrines deal with finding the plaintiff’s original position, not with apportioning liability.  The first accident remains a cause of the entire indivisible injury suffered by the plaintiff under the “but for” approach to causation endorsed by the Supreme Court of Canada in Resurfice Corp. v. Hanke, 2007 SCC 7, [2007] 1 S.C.R. 333.  As noted by McLachlin C.J.C. in that case, showing that there are multiple causes for an injury will not excuse any particular tortfeasor found to have caused an injury on a “but-for” test, as “there is more than one potential cause in virtually all litigated cases of negligence” (at para. 19).  It may be that in some cases, earlier injury and later injury to the same region of the body are divisible.  While it will lie for the trial judge to decide in the circumstances of each case, it is difficult to see how the worsening of a single injury could be divided up.