Liability
4 The appellant did not dispute that it was obliged to take reasonable care for the respondent's safety in her use of the machine. It accepted that there was a foreseeable risk that the respondent might use one of the circuit machines in an inappropriate manner and thereby suffer an injury. It submitted, however, that it had reasonably responded to the risk of injury, according to the so-called Shirt calculus in the well known observations of Mason J in Wyong Shire Council v Shirt (1980) 146 CLR 40 at 47-48. It further submitted that, if it had not, the respondent had not shown that its negligence caused her injury.
5 In my opinion, these submissions should not be accepted. It is sufficient to consider provision of adequate instruction in the use of the machine.
6 The respondent was an experienced gymnasium user. She had used circuit machines at another gymnasium, but had not previously used or even seen a seated leg curl machine. The machines she had used included a leg extension machine, a type of machine which had been part of a gymnasium's equipment for many years. At the time of her injury, February 2001, seated leg curl machines (as distinct from prone leg curl machines) had been relatively recently developed and were not commonly found in a circuit.
7 A leg extension machine and the seated leg curl machine at the appellant's gymnasium were similar in appearance. Both had a seat in front of which was an upper padded roller and a lower padded roller. The word "roller", commonly used in the proceedings, is convenient but not entirely accurate, see below. For the leg extension machine the occupant of the seat put the knees over the upper roller and the ankles under the lower roller, and extended the legs against the resistance of the lower roller brought about by an adjustable weighting system. For the seated leg curl machine the occupant put the knees under the upper roller and the ankles over the lower roller, and curled the legs against the resistance of the lower roller brought about by an adjustable weighting system.
8 The leg extension machine of which there were photographs in evidence had an incompletely rounded upper roller, more padded appropriately for the back of the knees to press against it, mounted on an extension from the front of the seat, such that the occupant could not sit with the knees under it. The seated leg curl machine had an incompletely rounded lower roller, more padded appropriately for the back of the ankles to press against it, and its upper roller was on a mounting to the side. At the trial there was dispute over whether the occupant of a seated leg curl machine could get the knees over the upper roller and the ankles under the lower roller, but photographs of the respondent and another person seated in that manner brought a finding which was not challenged on appeal.
9 The judge found -
"49. It is clear from perusal of the photographs of the leg extension machine and the leg curl machine that there is a marked similarity in the set up and appearance of the machines, each of them having a seat area and two rollers, albeit there is some slight difference in that the leg curl machine does not have two round rollers."
10 The respondent had attended the appellant's gymnasium for other activities, but not involving a seated leg curl machine. There came her first attendance at a circuit class. There was no evidence of what occurred when she "signed up" for the class.
11 There were 30 to 35 persons in the class, with one instructor. The instructor asked the class in general whether anybody was suffering from any injury and whether anyone had not done circuit classes before. The respondent did not respond to the inquiry, because she had attended circuit classes before although not at the appellant's gymnasium. The instructor did not explain or demonstrate the use of any of the circuit machines.
12 The class performed warm up activities. It was then split into two groups, half for aerobics and half on the circuit machines. After aerobic exercises, the respondent's group was told to change to the circuit machines.
13 There were about 20 circuit machines, and the members of the class were under pressure to keep moving at a fast rate. About a minute or a little longer was allowed for each machine before the user moved on to the next machine. Within this time, the user had to adjust weights and otherwise get into a position to use the machine, as well as use it.
14 The respondent was not familiar with the first of the circuit machines. She asked the class member behind her how it worked, who showed her, but there was no time for her to use the machine. The respondent was familiar with the next machine and used it. She moved to the third machine, the seated leg curl machine. Although recognising that it was different from the leg extension machine she had used, the respondent thought from her experience at the other gymnasium that it was a leg extension machine. She assumed that the machine was a leg extension machine, and a kind of machine she knew how to use; at one point she said she "saw a new model of leg extension machine".
15 The respondent had to adjust the weights, and did so. She sat with her knees over the upper roller and her ankles under the lower roller. The machine was not moving, and she thought there may be a brake needing releasing. She leaned forward seeking a brake, and as she did so the upper roller moved and threw her forward in the seat and her left leg was caught and twisted. She heard a cracking in her left leg and experienced severe pain; in fact she suffered a fracture of the upper end of the tibia.
16 The mechanism of this movement of the machine was not clearly explained, but it was not suggested that its operation was defective for a seated leg curl machine. It appears that release of a lever on the machine caused the upper roller to move forward and the lower roller to move down to positions appropriate for exercising the targeted muscles, and the movement must have been unwittingly initiated by the respondent.
17 The appellant submitted that it had reasonably responded to the risk of injury because the seated leg curl machine had attached to it a diagram indicating its type and the method of use, so that a user unfamiliar with the machine could readily see that it was a seated leg curl machine and how it should be used. If that were so, it said, no question of adequacy of the instructor's inquiry arose, but as a fall-back it submitted that it reasonably responded to the risk of injury by the instructor's inquiry, which it said was sufficient to cause members of the class unfamiliar with the circuit machines to make that known so that there could be individual explanation and demonstration.
18 The appellant further submitted that, as a matter of causation, when the respondent believed that the third machine was a leg extension machine although recognising that it was different from the machine she had previously used, but did not check the correctness of her belief and used the machine as a leg extension machine, the cause of her injury was her use of an unfamiliar machine without finding out how it should be used; and that a more extensive inquiry by the instructor would not have caused the respondent to ask for individual explanation or demonstration because she believed she was familiar with the circuit machines, and any inadequacy in the inquiry was not causative of her injury.