Alleging that she had suffered serious impairment of body function and permanent serious disfigurement, plaintiff brought suit for injuries she sustained when she was struck by an automobile. On August 15, 1975, plaintiff was watching her fiancé play softball at a city park when she decided to purchase a Coke from an ice cream truck parked across the street. Taking some change with her, she crossed the road to the truck. When she arrived, plaintiff realized she needed more money and began to recross the street towards her vehicle. Somewhere in the middle of the street an automobile hit her.
As a result of the accident, plaintiff suffered a broken clavicle and a fractured left leg. The leg injury required surgery to insert a steel rod in plaintiff’s thigh. In addition, plaintiff’s leg and buttocks were marred by scars.
In her lawsuit, plaintiff joined as defendants Marilyn Hess, the driver of the car, William Hess, the lessee of the car, Stark Hickey East, the lessor, and the car’s owner," Ford Motor Company. Plaintiff also joined as defendants the driver of the ice cream truck, Anna Maria Fiore, and the truck’s owner, Vito Fiore. The Fiores settled with the plaintiff before the close of the trial.
*17The jury returned a verdict of $30,000 but found plaintiff to have been one-third negligent. Plaintiff moved for judgment notwithstanding the verdict or, in the alternative, a new trial. The trial court denied the motion and entered a judgment for $20,000. Plaintiff appeals by right.
Plaintiff raises four claims of error. We note at the outset that plaintiffs appellate relief is limited to a new trial. Although plaintiff moved in the trial court for a judgment notwithstanding the verdict or new trial, she had not previously brought a motion for directed verdict. Thus, her motion could be treated only as a motion for a new trial. See 2 Honigman & Hawkins, Michigan Court Rules Annotated (2d ed, 1982 Cum Supp), p 167. Accordingly, we treat plaintiff’s appeal as an application for a new trial only. Burk v Warren, 105 Mich App 556, 560; 307 NW2d 89 (1981).
Plaintiff’s first two claims of error raise, in fact, only one issue and will be consolidated for discussion. Plaintiff argues, in essence, that the injury to her leg was a serious impairment of a body function as a matter of law and that the question as to whether it constituted such an impairment should not have been submitted to the jury. Michigan’s no-fault insurance law drastically restricts tort liability for injuries resulting from automobile accidents. MCL 500.3135; MSA 24.13135 provides:
"A person remains subject to tort liability for noneconomic loss caused by his or her ownership, maintenance, or use of a motor vehicle only if the injured person has suffered death, serious impairment of body function, or permanent serious disfigurement.”
Thus, a plaintiff can recover in tort only if her injury meets the statute’s "threshold” requirement —i.e., only if she has suffered "death, serious *18impairment of body function, or permanent serious disfigurement”.
The Supreme Court has ruled recently that, under certain circumstances, whether the plaintiff has suffered a serious impairment of body function is a question of law for the court to decide:
"We hold that when there is no factual dispute regarding the nature and extent of a plaintiff’s injuries, the question of serious impairment of body function shall be decided as a matter of law by the court. Likewise, if there is a factual dispute as to the nature and extent of a plaintiff’s injuries, but the dispute is not material to the determination whether plaintiff has suffered a serious impairment of body function, the court shall rule as a matter of law whether the threshold requirement of MCL 500.3135; MSA 24.13135 has been met.” Cassidy v McGovern, 415 Mich 483, 502; 330 NW2d 22 (1982).
Because no factual dispute existed as to the nature and extent of the plaintiff’s injuries, whether those injuries constituted a "serious impairment of body function” is a question of law.
An "impairment of body function” is an impairment of an important body function. Cassidy v McGovern, supra, p 505. Plaintiff suffered an injury to her left leg interfering with her ability to walk. As the Court said in Cassidy, supra, p 505, "[wjalking is an important body function”. Moreover, we find that, as a matter of law, plaintiff suffered a serious impairment of her ability to walk. She was hospitalized for five days with her left leg in traction. For three months afterwards, she was unable to move herself about without the aid of a wheelchair, a walker or crutches.
The trial court erred, therefore, by submitting *19the "serious impairment” question to the jury.1 We must decide, however, whether this error deprived plaintiff of a fair trial. If it did, then the trial court abused its discretion by denying plaintiff’s motion for a new trial and we may reverse. See Willett v Ford Motor Co, 400 Mich 65; 253 NW2d 111 (1977).
The trial court’s error denied plaintiff a fair trial only if the jury, in fact, did not find that she suffered a serious impairment of body function. In the absence of such a finding, the jury may have assessed damages for only plaintiff’s permanent serious disfigurement.2 Unfortunately, the record does not reveal the jury’s specific factual findings. Indeed, the trial court submitted a verdict form to the jury which failed to ask for the necessary information. The verdict form posed the question: "Did plaintiff sustain serious impairment of body function or permanent serious disfigurement?” The jury’s simple "yes” response3 does not indicate which of three possible factual findings lay behind the verdict. The jury could have found that the plaintiff suffered a serious impairment of body function, a permanent serious disfigurement or *20both. On the basis of this record, an appellate court cannot decide whether the trial court’s error in submitting the "serious impairment” question to the jury denied plaintiff a fair trial. Yet we cannot ignore the possibility that the trial court’s error had such an effect.4 Accordingly, we hold that the interests of justice require that we grant plaintiff a new trial.
Plaintiff’s final claims of error are without merit5 and may be discussed briefly. She argues that the jury, in computing her portion of negligence, determined the Fiores’ share of the total negligence involved and, thus, improperly considered the settlement. The jury did not state that it assessed the Fiores’ share of negligence in computing the plaintiffs share. However, considering their share would not have been improper. Under Michigan’s system of "pure” comparative negligence, a plaintiffs "damages are reduced in proportion to the contribution of that person’s negligence * * Placek v Sterling Heights, 405 Mich 638, 661; 275 NW2d 511 (1979), quoting Kirby v Larson, 400 Mich 585; 256 NW2d 400 (1977) (opinion of Williams, J.). To arrive at the plaintiffs share, a jury may compute the proportionate negligence of each tortfeasor and subtract these shares *21from the total.6 Thus, the jury in this case may have first determined that defendant Anna Maria Fiore and defendant Marilyn Hess were each one-third negligent and then assigned the remaining third to plaintiff. If they did so, the jury did not consider the settlement of the Fiores but rather their share of negligence. This is not improper.
Finally, plaintiff complains that the judge directed the jury to find plaintiff to have been one-third negligent. This claim is without merit. During their deliberations the jury sent a note to the trial court asking: "If we find that the ice cream truck, the pedestrian and the driver of the vehicle are equally responsible, can we assume that the percent of negligence will be 33-1/3 percent each?” The court replied: "Question seven [on the verdict form] states * * * using one hundred percent of the total, combined negligence of the parties which proximately caused the injuries or damage to the plaintiff, what percentage of such negligence is attributable to Carolyn LaHousse? Your answer would be 33-1/3 percent.” Although the court might have answered the jury’s question more properly with a simple "yes”, we cannot say that its response was error. The court’s reply conveyed to the jury only that if they found each party equally negligent then they would find plaintiff to have been 33-1/3 percent negligent. This is merely a hypothetical statement and leaves open the critical inquiry: What is the proper percentage of negligence attributable to plaintiff? Consequently, the trial court did not err in its response to tbe jury.
Reversed and remanded for a new trial consis*22tent with this opinion. No costs, neither party having prevailed in full.
The trial court instructed the jury:
"The law in Michigan provides that plaintiff may recover damages in this case if she suffered serious impairment of bodily functions. Based upon the evidence in this case, you must decide whether plaintiff suffered an impairment of a body function; and if so, whether that impairment of the body function was serious * *
In Abraham v Jackson, 102 Mich App 567; 302 NW2d 235 (1980), for example, the jury found that the plaintiff’s injuries did not amount to a serious impairment of body function, but decided that he had suffered a permanent serious disfigurement. The jury went on to award damages for only plaintiff’s disfigurement.
The jury answered the court’s question affirmatively in its second attempt to return a verdict. In its first attempt, the jury replied in the negative. After polling two jurors, however, the trial court decided that the required number of jurors had not agreed that plaintiff had suffered neither sort of injury. Thus, he sent the jury back for further deliberations.
The record suggests that the jury may have found that plaintiff suffered only permanent serious disfigurement. There was evidence of plaintiffs scarring. In addition, when the jurors were first polled two admitted that they found plaintiff to have suffered only permanent serious disfigurement.
The trial court, however, committed an additional error not raised on appeal. In its instructions, the trial court charged the jury:
"Your verdict will be for the defendant if plaintiff did hot suffer an injury which resulted in a serious impairment of bodily function or if the defendant was not negligent or if negligent, such negligence was not a proximate cause of plaintiff’s injury.”
This was an incorrect statement of the law, for, even if the jury found no serious impairment of body function, their verdict would be for the plaintiff if they found permanent serious disfigurement.
This is not to suggest, however, that each defendant is liable only for that portion of damages equivalent to his share of negligence. As to whether the liability of joint tortfeasors may be so apportioned, we express no opinion.